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For HR Managers and Business Owners

The Workplace Wellness Nutrition Guide

The practical, evidence-based guide to nutrition in the workplace. What your people eat is directly affecting your business.

For HR managers and business owners Share directly with employees Menopause in the workplace Desk workers and shift workers

Two guides in one

A section for HR and leadership – and a section to share directly with your team

Tracey Warren, Naturopathic Nutritional Therapist

Tracey Warren

Naturopathic Nutritional Therapist · Nantwich, Cheshire

Workplace wellness is one of the most under-resourced areas in UK business. Organisations invest in standing desks, EAP programmes and mental health first aiders – but almost nobody addresses the single biggest driver of energy, focus, mood and resilience at work: what people eat.

“You cannot expect high performance from people who are running on caffeine, biscuits and skipped lunches. This guide gives you the practical knowledge to change that – without a big budget or a full-time wellness team.”

Part One
For HR Managers and Business Owners
The business case, what to look for and what you can do without a big budget
01

The Business Case for Workplace Nutrition

The numbers are impossible to ignore

Poor nutrition in the workplace costs UK businesses billions every year in lost productivity, absenteeism and presenteeism – employees who are physically present but mentally and physically unable to perform at their best. The research is consistent and clear.

20%

Productivity Loss

Linked directly to poor diet and nutrition at work. Employees who eat well perform measurably better.

£1,500

Per Employee Per Year

Average annual cost of presenteeism driven by poor health. Twice the cost of absenteeism.

14m

Working Days Lost

To stress, depression and anxiety annually in the UK. Nutrition plays a direct and measurable role.

1 in 4

Skip Lunch Daily

UK employees regularly skip lunch at their desks. The afternoon productivity consequence is severe.

900k

Women Leave Work Early

Due to unmanaged menopause symptoms. Many more remain but significantly underperform.

£5

Return Per £1 Spent

Average ROI on workplace wellbeing investment according to CIPD research.

Your people’s nutrition is a business issue. Not just a personal one.

What poor workplace nutrition looks like in practice

The 3pm productivity cliff

A predictable daily dip in focus, energy and output driven by blood sugar crashes from poor lunch choices or no lunch at all. Costs organisations hours of effective output every single day.

Chronic fatigue and presenteeism

Employees who are physically present but mentally absent. Estimated to cost twice as much as absenteeism. Poor diet is a primary and widely overlooked driver.

High cortisol and poor decision-making

Chronic stress combined with poor nutrition elevates cortisol which directly impairs judgement, emotional regulation and creative thinking. Your leadership team is not immune.

Menopause-related attrition

Around 900,000 women have left the UK workforce due to unmanaged menopause symptoms. Many more remain but are significantly underperforming compared to their potential.

Quick self-assessment – how does your organisation score?

Score: 1 = Not at all  ·  3 = Sometimes  ·  5 = Always
Employees take a genuine lunch break away from their desks
1
2
3
4
5
Nutritious food options are available in communal areas
1
2
3
4
5
A menopause policy or support framework is in place
1
2
3
4
5
Wellbeing is measured in staff surveys and acted upon
1
2
3
4
5
Nutrition or energy education has been shared with employees
1
2
3
4
5
Water is freely available and employees are encouraged to drink it
1
2
3
4
5
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
02

What HR and Leadership Can Do

Practical actions that do not require a large budget

You do not need a corporate wellness programme or a big budget to make a meaningful difference. The most impactful changes are often the simplest ones.

01
Protect lunch breaks. Make it a cultural expectation.
  • One in four UK employees regularly skips lunch. Leadership behaviour sets the norm.
  • Model the behaviour from the top – managers who eat at their desks signal that lunch breaks are not acceptable
  • Avoid scheduling meetings over the core lunch window where possible
  • A genuine 30-minute break increases afternoon productivity significantly – it is not lost time
02
Review what you offer in the office or canteen.
  • Remove or reduce ultra-processed snacks from meeting rooms and communal areas
  • Replace biscuit tins with mixed nuts, fruit and dark chocolate – the cost difference is minimal
  • If you provide catering, ensure protein-rich options are always available at lunch
  • Provide a water cooler or encourage water bottles – dehydration is the most overlooked cause of afternoon fatigue
03
Implement a menopause policy and support framework.
  • The Menopause Employment Protection Bill has raised the profile of this issue significantly
  • A simple policy signals to female employees that their experience is understood and respected
  • Flexible working, temperature control and access to cold water are low-cost reasonable adjustments
  • Train line managers to have sensitive, informed conversations about menopause at work
04
Share practical nutrition education with your team.
  • Share this guide with your employees – the second half is written directly for them
  • Consider a lunch and learn session on workplace nutrition – one hour, significant impact
  • A quarterly wellbeing newsletter with practical nutrition content costs nothing and builds culture
  • Signpost employees to accessible, affordable resources rather than expensive programmes
05
Measure and acknowledge the impact.
  • Include nutrition and energy questions in staff surveys to establish a baseline
  • Track sickness absence before and after wellbeing initiatives
  • Celebrate wellbeing wins alongside business results – it signals that people matter
  • ROI on wellbeing investment averages £5 returned for every £1 spent according to CIPD research
HR Workplace Nutrition Checklist
Lunch breaks are protected and modelled by leadership
Communal areas offer at least one genuinely nutritious snack option
Water is freely available and employees are encouraged to drink it
A menopause policy is in place or in development
Line managers have received basic awareness training on menopause
Nutrition education has been shared with the team
Catering or canteen provision includes high-protein lunch options
Wellbeing is measured in staff surveys at least annually
Vitamin D supplements are offered to staff in winter months
Meeting rooms offer nutritious refreshments rather than biscuits and pastries
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
Part Two
For Employees
Share this section directly with your team. Practical, honest and designed to make an immediate difference.
03

Energy and Focus at Work

Why you crash at 3pm – and how to stop it

The 3pm energy slump is so common in workplaces that most people think it is normal. It is not. It is a direct consequence of what was eaten – or not eaten – earlier in the day. Here is what is happening and how to fix it.

1
Eat breakfast before you leave home. Every day.
  • Skipping breakfast causes blood sugar to drop within 2 to 3 hours, triggering cortisol and fatigue
  • A high-protein breakfast – eggs, Greek yoghurt, smoked salmon – keeps you stable until lunch
  • A cereal bar or toast alone will spike and crash you before 10am
2
Make your lunch count. Protein and vegetables every time.
  • A high-carb lunch – pasta, white bread sandwich, meal deal with crisps – causes the 3pm slump
  • Aim for at least 20 to 25g protein at lunch – chicken, fish, eggs, lentils, Greek yoghurt
  • Add vegetables or salad to increase fibre and stabilise energy for the afternoon
  • Eat away from your desk if possible – even 15 minutes of genuine break improves afternoon focus
3
Drink water constantly. Not just when you are thirsty.
  • Thirst is a late signal – by the time you feel thirsty you are already mildly dehydrated
  • Even 1 to 2% dehydration reduces cognitive performance, concentration and mood significantly
  • Aim for 2 litres across the working day – a 750ml bottle on your desk refilled twice
  • Caffeine after 12pm does not help – it disrupts sleep which makes tomorrow worse

What to eat at your desk when you are busy

Choose This Instead of This Why
Mixed nuts and dried fruitBiscuits or a chocolate barProtein and healthy fat vs sugar spike and crash
Greek yoghurt potFlavoured yoghurt or cereal bar18 to 20g protein vs mostly sugar. No comparison.
Oatcakes with nut butterCrackers or rice cakesSlow release energy vs quick spike with no protein
Hard boiled eggs (2 pack)Pastry or sausage rollComplete protein vs refined carbs and poor quality fat
Dark chocolate 70% (2 to 3 squares)Milk chocolate or sweetsMagnesium and antioxidants vs pure sugar
Sparkling water or herbal teaEnergy drink or fourth coffeeHydration vs blood sugar spike followed by deeper crash
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
04

Stress, Cortisol and Food

The connection most people do not know about

Chronic workplace stress is not just a mental health issue. It directly affects what you eat, how your body processes food and where it stores fat. The relationship between stress and nutrition runs in both directions – and understanding it changes everything.

What high cortisol does to your eating

Cortisol increases cravings for sugar and refined carbs, reduces satiety signals so you feel less full, and drives fat storage directly to the abdomen. Stress eating is physiological, not weakness.

What skipping meals does to your cortisol

Skipping meals raises cortisol further. It is a vicious cycle – stress makes you skip meals, skipping meals raises stress hormones, which makes you more stressed and more likely to reach for sugar.

Foods that actively reduce cortisol

Dark leafy greens (magnesium), oily fish (omega-3), berries (antioxidants), dark chocolate 70%+ and fermented foods. These are not wellness trends – they are evidence-based.

Foods that worsen cortisol response

Caffeine in excess, alcohol, refined sugar and ultra-processed food all elevate cortisol. Reducing these during high-pressure periods is more effective than most people realise.

Key
The three most important things during a stressful period at work
  • Do not skip meals – it raises cortisol and makes everything harder
  • Reduce caffeine after 12pm – it elevates cortisol and disrupts the sleep that stress already damages
  • Eat at least one genuinely nutritious meal per day – even if everything else goes wrong
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
05

Menopause in the Workplace

For women experiencing symptoms and the managers who support them

Around 4.5 million women aged 45 to 55 are currently in work in the UK. The majority are navigating perimenopause or menopause symptoms while doing their jobs. What most of them have never been told is that what they eat every day directly influences how severe those symptoms are.

Hot flushes during meetings

Triggered by blood sugar spikes from caffeine and refined carbs. A protein-rich lunch and reducing afternoon caffeine significantly reduces frequency.

Practical fix: Protein at every meal. No caffeine after 12pm. Reduce sugar.

Brain fog and poor concentration

Oestrogen decline affects cognitive function. Omega-3 rich foods – oily fish, walnuts, flaxseed – directly support brain function and are the most important foods at this stage.

Practical fix: Oily fish twice a week. Walnuts at your desk. Ground flaxseed daily.

Exhaustion that does not respond to sleep

Progesterone decline disrupts sleep architecture. Magnesium glycinate before bed, reducing caffeine and eating enough throughout the day all make a measurable difference.

Practical fix: Magnesium glycinate 300mg before bed. Eat regularly. No caffeine after noon.

Anxiety and mood changes

Oestrogen decline reduces serotonin production. A gut-supporting diet rich in diverse plant foods, fermented foods and omega-3 directly supports mood stability.

Practical fix: Greek yoghurt, kefir or sauerkraut daily. Reduce alcohol. Eat regularly.

Weight gain around the middle

Hormonal changes shift fat storage to the abdomen. Protein intake and blood sugar stability are the two most powerful dietary responses – not eating less.

Practical fix: 25 to 30g protein at every meal. Reduce refined carbs. Do not skip meals.

Joint pain and physical discomfort

As oestrogen declines, inflammation rises. An anti-inflammatory diet is not optional during this transition – it is essential for managing pain and maintaining physical capacity at work.

Practical fix: Oily fish, berries, turmeric, leafy greens daily. Reduce alcohol and sugar.

For a comprehensive menopause nutrition guide that employees can access independently, see the Managing Menopause Through Food plan at traceywarrennutrition.co.uk

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
06

Nutrition for Desk Workers

Specific challenges – and specific solutions

Desk workers face a unique set of nutritional challenges. Sedentary for most of the day, screen-fatigued by afternoon, snacking out of boredom or stress rather than hunger, and often with no proper break from their desk.

Sitting all day and blood sugar

Physical inactivity makes blood sugar spikes more severe and longer lasting. A short walk after lunch – even 10 minutes – measurably improves blood sugar control and afternoon focus.

Screen fatigue and food choices

Decision fatigue from screen work depletes the mental energy needed to make good food choices. Pre-preparing lunch and having good snacks at your desk removes the need for willpower.

Eating at the desk

Eating while working means you eat faster, register fullness less accurately and eat more overall. Even 15 minutes away from your screen at lunch makes a significant difference.

Chronic dehydration

Office environments are dry, air-conditioned and full of caffeine. Most desk workers are mildly dehydrated for most of the working day. Brain fog and poor concentration are often just thirst.

The desk worker’s daily quick wins

1
Water on your desk
750ml bottle. Fill it twice. Drink before you feel thirsty.
2
Protein at lunch
Chicken, tuna, eggs, lentils. Every single day without exception.
3
No caffeine after 12
Switch to herbal tea. Sleep better. Feel better tomorrow.
4
Walk after lunch
10 minutes. Measurably improves blood sugar and afternoon focus.
5
Good snacks at your desk
Nuts, dark chocolate, oatcakes. Remove the need for willpower.
6
Leave your desk at lunch
Even 15 minutes. Eat consciously. Register fullness properly.
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
07

Nutrition for Shift Workers

Nurses, care workers, factory staff, security, hospitality

Shift work is one of the most nutritionally demanding working patterns. Disrupted sleep, irregular meal times, limited food options during shifts and the physical demands of the work create a perfect storm of poor nutrition outcomes.

1
Eat to your shift pattern – not the clock.
  • Your body responds to when you eat relative to when you sleep and work – not what the clock says
  • For night shifts, eat a proper meal before your shift starts and a lighter meal mid-shift
  • Avoid large meals within 2 to 3 hours of sleep regardless of what time that is
  • Keep a protein-rich snack for the lowest energy point – usually 3 to 5am for night workers
2
Manage caffeine strategically – not constantly.
  • Caffeine is useful for shift workers but needs to be timed carefully
  • Use caffeine at the start of a shift for alertness – not throughout to maintain energy
  • Stop caffeine consumption at least 6 hours before your planned sleep window
  • Hydration is more important than caffeine – dehydration causes more fatigue than most people realise
3
Prepare food in advance. Options disappear on a shift.
  • Vending machines and canteens offer very poor nutritional options, particularly during unsociable hours
  • Batch cook on days off and portion into containers for each shift
  • Keep emergency staples in your bag – mixed nuts, high protein bars (20g+), oatcakes
  • A thermos of homemade soup or a cold rice pot is far better than anything available mid-shift
4
Protect your gut health. Shift work disrupts it significantly.
  • Irregular eating patterns directly disrupt the gut microbiome and circadian rhythm
  • Include fermented foods daily – Greek yoghurt, kefir, sauerkraut – to support gut bacteria
  • Aim for 30 different plant foods per week – even small amounts count towards the total
  • Magnesium glycinate helps with sleep quality regardless of when sleep occurs
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
08

Mental Health and Food

The gut-brain connection every employer needs to understand

Around 95% of serotonin – the neurotransmitter most associated with mood, wellbeing and emotional regulation – is produced in the gut. The connection between what we eat and how we feel mentally is not metaphorical. It is physiological, direct and measurable.

The gut-brain axis

The gut and brain are in constant two-way communication via the vagus nerve. The state of your gut microbiome directly influences anxiety levels, mood stability, stress resilience and cognitive function.

Ultra-processed food and mental health

Multiple large-scale studies now link high ultra-processed food consumption with increased rates of depression and anxiety. The mechanism is gut dysbiosis, chronic inflammation and nutrient depletion.

Nutrients most commonly deficient in depression

Omega-3 (oily fish, walnuts), Vitamin D (sunlight, oily fish, eggs), Magnesium (leafy greens, seeds), B vitamins (whole grains, meat, eggs), Iron (particularly in women). All common and impactful.

Blood sugar and anxiety

Blood sugar crashes feel physically similar to anxiety – racing heart, sweating, difficulty concentrating. Many people experience what they believe is anxiety that is partly driven by blood sugar instability.

Key
The five most important foods for mental health at work
  • Oily fish twice a week – omega-3 is the most evidence-backed nutritional intervention for mood
  • Fermented foods daily – Greek yoghurt, kefir, sauerkraut to support the gut-brain axis
  • Dark leafy greens daily – magnesium supports the nervous system and reduces anxiety
  • Berries – anthocyanins reduce neuroinflammation which is increasingly linked to depression
  • Regular eating – blood sugar stability is the foundation of emotional regulation
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
09

Supplements for Focus and Concentration

Food first. Always. But these have strong evidence behind them.

The supplement industry is full of overclaiming. This section covers only those with genuine, consistent evidence for cognitive performance, focus and energy at work. None of these replace a good diet – but for people who are eating well and still struggling, they can make a meaningful difference.

1
Magnesium Glycinate – 300mg before bed
  • The most deficient mineral in the UK adult population and one of the most impactful for cognitive function
  • Directly supports memory, learning, stress regulation and sleep quality
  • Poor sleep is the single biggest driver of poor workplace performance – magnesium glycinate consistently improves sleep depth
  • Glycinate form is best absorbed. Avoid magnesium oxide – it is poorly absorbed.
2
Omega-3 (EPA and DHA) – 1 to 2g daily
  • The most evidence-backed supplement for brain health, focus and cognitive performance
  • EPA reduces neuroinflammation linked to depression, anxiety and brain fog
  • DHA is a structural component of brain cell membranes – essential for cognitive function
  • Look for a combined EPA and DHA of at least 1000mg per dose. Algae-based versions available for plant-based workers.
3
B Complex – daily with breakfast
  • B vitamins are critical for energy production, neurotransmitter synthesis and stress response
  • B6 directly supports serotonin and dopamine production – the neurotransmitters of motivation and mood
  • B12 is essential for nervous system function and mental clarity – deficiency causes fatigue and brain fog
  • Depleted rapidly by stress – particularly important during demanding periods at work
4
Vitamin D3 with K2 – 1000 to 2000 IU daily
  • Around 1 in 5 UK adults are deficient in Vitamin D – rising to 1 in 3 in winter months
  • Deficiency causes fatigue, low mood, poor concentration and reduced immunity
  • Particularly important for desk workers and shift workers with limited sunlight exposure
  • Always take D3 and K2 together. Take with a meal containing fat – Vitamin D is fat soluble.
5
Lion’s Mane Mushroom – 500 to 1000mg daily
  • One of the most interesting emerging supplements for cognitive function with a growing evidence base
  • Contains compounds that stimulate Nerve Growth Factor – supporting brain cell growth and connectivity
  • Studies show improvements in focus, memory and mild cognitive decline
  • Effects build over 4 to 8 weeks. Look for a fruiting body extract – significantly higher active compounds.
6
Ashwagandha – 300 to 600mg daily
  • Consistent evidence for reducing cortisol, improving stress resilience and supporting cognitive performance under pressure
  • Particularly useful during high-pressure periods – restructuring, deadlines, demanding projects
  • Studies show reductions in perceived stress of 30 to 44% compared to placebo
  • Takes 4 to 8 weeks for full effect. KSM-66 is the most studied and bioavailable form. Not suitable during pregnancy.
Important note

Always speak to a GP before starting new supplements if you are on medication or have existing health conditions. Supplements work best alongside a good diet – they are not a replacement for it. For Tracey’s specific brand recommendations visit traceywarrennutrition.co.uk

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
10

Detoxifying the Workplace

The hidden toxins in your office that nobody talks about

Almost no workplace wellness conversations address the chemical environment employees spend 40 hours a week in. The research on everyday office chemicals – from air fresheners to cleaning products – and their impact on hormones, focus and long-term health is well-established and widely ignored.

Indoor air can be up to 5 times more polluted than outdoor air.

Plug-in air fresheners and aerosol sprays

Most contain synthetic fragrances which are a cocktail of undisclosed chemicals. Phthalates – used to make scent last longer – are endocrine disruptors that interfere with oestrogen and testosterone.

Synthetic cleaning products

Many contain quaternary ammonium compounds (quats), chlorine bleach and synthetic fragrances. Quats are linked to respiratory sensitisation and disruption of the gut microbiome.

Printer ink and toner

Laser printers emit ultrafine particles during printing that are small enough to penetrate deep into the lungs. High-volume printing areas without adequate ventilation are a genuine occupational health concern.

Plastic water bottles and food containers

BPA and its replacements leach from plastic into food and drink – particularly when heated. These are oestrogen-mimicking chemicals that accumulate in the body over time. Switching to glass or stainless steel is a simple, permanent fix.

Scented candles

Paraffin wax candles release toluene and benzene when burned – both classified as carcinogens. In enclosed offices with poor ventilation, regular candle burning measurably reduces air quality.

Carpets, furniture and off-gassing

New carpets, furniture, paint and building materials release VOCs for months to years after installation. Formaldehyde – found in many synthetic materials – is a known carcinogen and common cause of headaches.

Simple swaps that make a real difference

Swap Out Swap In Why It Matters
Plug-in air freshenersOpen windows, plants, essential oil diffuserRemoves phthalates and VOCs from the air entirely
Aerosol cleaning spraysWhite vinegar, bicarbonate of soda or certified non-toxic brandsEliminates quats and synthetic fragrance from the working environment
Plastic water bottlesGlass or stainless steel bottles for all staffRemoves BPA and BPS exposure permanently at very low cost
Synthetic scented candlesNo candles or soy wax with essential oils onlyEliminates benzene and toluene from indoor air
Air freshener sprays in toiletsExtractor fans, natural bamboo charcoal bagsRemoves VOCs and fragrance chemicals from a confined space
Unnecessary printed documentsDigital alternatives where possibleReduces thermal paper BPA exposure for reception and admin staff

The best air-purifying plants for offices

Spider plant (Chlorophytum comosum)

One of the most effective air purifiers available. Removes formaldehyde, xylene and carbon monoxide. Virtually indestructible and thrives in office lighting. Recommended for printer areas.

Peace lily (Spathiphyllum)

Removes benzene, formaldehyde, trichloroethylene and ammonia. Thrives in low light. Also increases humidity which improves respiratory comfort in air-conditioned environments.

Snake plant (Sansevieria)

Converts CO2 to oxygen at night as well as during the day. Extremely low maintenance and tolerates low light. Ideal for desk plants and communal areas.

Pothos (Epipremnum aureum)

Highly effective at removing VOCs including formaldehyde and benzene. Very low maintenance and fast growing. One plant quickly becomes several – the best value air purifier in any office.

One medium-sized plant per 10 square metres of office space is the widely cited guideline for meaningful air quality improvement. A well-planted office is not just aesthetically better – it is measurably healthier.

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
11

Reducing Absenteeism Through Nutrition

The immune system is built in the gut – and the gut is built in the kitchen

Sickness absence costs UK employers an average of £554 per employee per year. Much of this is driven by respiratory infections, fatigue-related illness and stress-related conditions – all of which are directly influenced by nutrition. A well-nourished immune system is more resilient, recovers faster and is less likely to succumb to workplace infections.

£554

Per Employee Per Year

Average cost of sickness absence in the UK. Much of this is preventable through better nutrition.

70%

Immune System in the Gut

Making diet the primary driver of immune resilience. What your team eats determines how often they get ill.

4x

More Likely to Get Ill

When chronically sleep-deprived. Sleep quality is directly nutrition-dependent – it all connects.

Key nutrients for immune resilience

Nutrient Best Food Sources Why It Matters
Vitamin CRed peppers, kiwi, broccoli, citrusStimulates white blood cell production. Reduces duration and severity of respiratory infections.
Vitamin DOily fish, eggs, fortified foods, sunlightRegulates immune response. Deficiency significantly increases susceptibility to respiratory infection.
ZincPumpkin seeds, oysters, meat, legumesEssential for immune cell development. Deficiency impairs almost every aspect of immune function.
SeleniumBrazil nuts (2 per day), tuna, eggsPowerful antioxidant that supports immune cell activity. Two Brazil nuts provides the full daily requirement.
IronRed meat, lentils, spinach, tofuDeficiency impairs immune cell production. Particularly important for women of working age.
ProbioticsGreek yoghurt, kefir, sauerkraut, kimchiSupport the gut microbiome housing 70% of immune cells. Daily consumption measurably reduces upper respiratory infections.
Omega-3Oily fish, walnuts, flaxseedReduces chronic inflammation which suppresses immune function. Supports faster recovery from illness.
1
Provide vitamin D supplements in winter – the ROI is extraordinary.
  • UK government guidance recommends vitamin D supplementation for all adults from October to March
  • A 90-day supply of vitamin D3 costs approximately £5 per person
  • Studies show vitamin D supplementation reduces respiratory infections by up to 42% in deficient individuals
  • If 10 employees avoid even one sick day each that is already a significant financial return on a minimal investment
2
Provide genuinely nutritious food options – not just any food.
  • Ultra-processed food drives gut dysbiosis which directly weakens immune function
  • Providing fruit, mixed nuts and Greek yoghurt alongside biscuits and pastries is not just wellness theatre – it is immune support
  • A fruit bowl as standard office provision – cost is minimal, impact on immune resilience over winter is real
3
Address the stress-immunity link directly.
  • Chronic stress suppresses immune function through sustained cortisol elevation
  • Employees who are chronically stressed are significantly more likely to get ill and take longer to recover
  • Workload management, psychological safety and adequate breaks are not just HR concerns – they are immune health interventions
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
12

What to Serve in Meetings

The biscuit tin is actively damaging the quality of your decisions

The standard meeting refreshments in most UK offices – biscuits, pastries, sugary drinks – create a predictable blood sugar spike in the first 20 minutes of a meeting, followed by a crash that impairs concentration, decision-making and creative thinking for the rest of it. These are the rooms where strategy is set, problems are solved and important decisions are made.

What you serve in meetings directly affects the quality of the decisions made in them.

What to serve instead – and where to get it

Serve This Not This Where to Get It
Mixed nuts and dried fruitBiscuits and shortbreadAny supermarket. Buy in bulk. Decant into bowls.
Dark chocolate 70%+ (broken into pieces)Milk chocolate bars or sweetsSupermarket own brand is fine. Hotel Chocolat for client meetings.
Fresh fruit platterDanish pastries and croissantsMost supermarkets sell pre-cut platters. Marks and Spencer for client meetings.
Greek yoghurt pots with berriesFlavoured yoghurts or cereal barsSupermarket own brand Greek yoghurt. Add frozen berries defrosted overnight.
Oatcakes with hummus or nut butterCrackers with processed cheeseSupermarket. Pret has good hummus pots for bought-in meetings.
Sparkling water and herbal teasSugary soft drinks and juiceStandard supermarket purchase. Fever-Tree sparkling water for client meetings.
Protein balls or energy bitesFlapjacks or cereal barsMarks and Spencer, Pret, Itsu or homemade in batches. Recipe below.

Easy no-bake energy balls – batch recipe for meetings

Makes 20 balls  ·  Takes 15 minutes  ·  Keeps 5 days in the fridge
Ingredients
  • 200g oats
  • 4 tbsp peanut or almond butter
  • 3 tbsp honey or maple syrup
  • 2 tbsp ground flaxseed
  • 50g dark chocolate chips
  • Pinch of salt
Method
  1. Mix everything together in a bowl
  2. Roll into 20 balls
  3. Refrigerate for 30 minutes
  4. Serve on a plate at room temperature
High protein. No refined sugar. Slow release energy. Costs approximately 20p per ball.
Template briefing note for office managers

Going forward, please replace meeting biscuits.

Going forward please replace biscuits and pastries in meetings with the following: a bowl of mixed nuts, a plate of dark chocolate (70%+), fresh fruit and a jug of sparkling water alongside the usual tea and coffee. For client meetings please also add a fresh fruit platter from Marks and Spencer or similar. The cost difference is minimal and the reasoning is that we want to support people’s focus and energy during meetings.

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
13

Hydration in the Workplace

The most overlooked driver of poor performance

Mild dehydration – as little as 1 to 2% of body weight in fluid loss – causes measurable reductions in cognitive performance, concentration, short-term memory and mood. In a typical office environment, most employees are mildly dehydrated for most of the working day. The economic cost is significant and almost entirely avoidable.

1-2%

Dehydration Threshold

The level at which cognitive performance measurably declines. Most people reach this before lunch.

23%

Cognitive Reduction

Drop in cognitive performance on tasks at even mild dehydration. The cost to your business is real.

2L

Daily Minimum

Minimum daily fluid intake recommended for adults in an office environment. Most employees drink far less.

Air conditioning removes moisture from the air

Air-conditioned offices have significantly lower humidity than outdoor environments. This increases insensible water loss through breathing and skin – most people do not notice it until they are already dehydrated.

Caffeine is a diuretic

Coffee and tea – consumed in large quantities in most offices – increase urine output. Four cups of coffee requires at least an extra 400ml of water to compensate. Most people do not drink this additional water.

Thirst is a late signal

By the time you feel thirsty you are already mildly dehydrated. Waiting to feel thirsty before drinking means spending most of the working day in a state of mild cognitive impairment.

People confuse thirst for hunger

The hypothalamus regulates both hunger and thirst and the signals can be confused. Many afternoon snack cravings in offices are actually thirst. Drinking 500ml of water before reaching for a snack resolves this for many people.

What counts and what does not

Counts Towards Hydration Counts but Use Wisely Does Not Help Hydration
Plain waterCoffee and tea (in moderation)Alcohol – actively dehydrating
Sparkling waterCoconut water – natural electrolytesEnergy drinks – high caffeine and sugar
Herbal teasMilk – contains water and electrolytesSugary soft drinks – drive fluid loss
Water-rich foods (cucumber, watermelon)Diluted juice – more water than juiceMore than 4 coffees – net dehydrating effect

The single most effective hydration intervention for an office is a large water bottle on every desk. Not a glass. Not a cup. A 750ml bottle that employees can see, track and refill. Visibility drives behaviour.

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
14

Five Working Lunches to Bring to the Office

All prepped in under 10 minutes the night before. All genuinely nutritious.

The best workplace lunch is one that is already made. Decision fatigue by midday means most people default to whatever is easiest – which is rarely the most nutritious option. These five lunches can all be made the night before in under 10 minutes.

01
Tuna and Brown Rice Pot
5 min prep · 35g protein
Ingredients
  • Cooked brown rice
  • 1 to 2 tins tuna in spring water
  • Spring onions and cucumber
  • Soy sauce and lemon juice
Method
  1. Mix cold rice with drained tuna
  2. Add spring onion, cucumber, soy and lemon
  3. Pack in a container. Eat cold or microwave 2 minutes.
02
Chicken and Avocado Wrap
5 min prep · 38g protein
Ingredients
  • 1 wholegrain wrap
  • 150g cooked chicken
  • Half an avocado, mashed
  • Spinach and cucumber
Method
  1. Spread mashed avocado on wrap
  2. Add chicken, spinach and cucumber
  3. Roll tightly, wrap in foil. Keeps well until lunchtime.
03
Lentil and Roasted Veg Salad
5 min prep · 20g protein · plant-based
Ingredients
  • 1 tin green lentils
  • Roasted veg (batch cooked)
  • 2 tbsp tahini
  • Lemon juice and cumin
Method
  1. Drain lentils and mix with roasted veg
  2. Combine tahini with lemon and cumin
  3. Drizzle over and pack in a container. Brilliant cold.
04
Salmon and Edamame Rice Bowl
5 min prep · 40g protein
Ingredients
  • Leftover cooked salmon
  • Brown rice
  • Frozen edamame (defrosted)
  • Soy sauce and sesame oil
Method
  1. Layer rice, salmon and edamame in a container
  2. Drizzle with soy sauce and sesame oil
  3. Eat cold or microwave 2 minutes. Outstanding nutritional density.
05
Overnight Oats with Flaxseed and Berries
1 min prep · 22g protein · doubles as breakfast
Ingredients
  • 80g oats
  • 250ml oat milk
  • 1 scoop protein powder
  • 2 tbsp ground flaxseed
  • Frozen berries
Method
  1. Mix everything in a jar the night before
  2. Add berries on top
  3. Grab from the fridge on the way out. Zero morning effort.
Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
15

The Monday Morning Reset

For when the weekend did not go to plan

Weekends happen. Social events, late nights, less structure around food and drink. Monday can feel like starting from behind before the week has even begun. This is a simple, realistic reset that does not require perfection – just a few key actions that make Monday manageable and set the week up well.

AM
Monday morning – before you leave the house
  • 500ml of water before anything else – you are dehydrated from the weekend regardless of how much you drank
  • A high-protein breakfast – eggs, Greek yoghurt or a protein smoothie. Not toast. Not nothing.
  • No caffeine until after breakfast – let cortisol do its natural morning job before you add caffeine
  • If you feel rough – add a B complex and a vitamin C to your breakfast. Both are water soluble and help with the after-effects of poor sleep.
MID
Monday midmorning – at your desk
  • Drink consistently throughout the morning – 750ml by 12pm
  • A small snack mid-morning if hungry – nuts, a piece of fruit, Greek yoghurt. Not biscuits.
  • If you are craving sugar it is almost certainly dehydration or blood sugar instability. Drink water first.
LUNCH
Monday lunch – make it count
  • The most important meal of the Monday. Protein and vegetables – no exceptions.
  • If you have nothing prepared – a chicken or tuna salad from any supermarket is fine. Not a meal deal with crisps.
  • Eat away from your screen if at all possible. Monday needs a proper break more than any other day.
  • A short walk after lunch on a Monday sets the tone for the whole week. Five minutes outside makes a measurable difference.
EVE
Monday evening – set Tuesday up
  • Make double at dinner – Tuesday lunch is already sorted
  • Prep your water bottle and snacks for tomorrow before you go to bed
  • No alcohol on a Monday – your body is still recovering and one drink will affect Tuesday significantly more than usual
  • Magnesium glycinate before bed – the best investment in a good Tuesday you can make on a Monday night
Remember

The Monday reset is not about punishment.

It is not about compensating for the weekend or starting a new diet on a Monday for the fifteenth time this year. It is simply about giving your body what it needs to function well today. Water. Protein. A walk. An early night. That is it.

Tracey Warren Nutrition  ·  traceywarrennutrition.co.uk
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