£138bn a year: why nutrition belongs on your wellbeing P&L

In January 2024, Vitality's Britain's Healthiest Workplace study — run with RAND Europe, the University of Cambridge and Mercer — reported that poor employee health cost UK businesses an average of 49.7 days per employee in lost productivity, equivalent to around £138.3bn across the economy. It was the largest figure in the study's ten-year history.

The report singled out musculoskeletal conditions, depression and poor sleep quality as the biggest drivers. Diet sits underneath all three: what people eat during the working day shapes energy, mood, sleep quality and long-term metabolic health. Yet on most wellbeing budgets, nutrition is still a fruit bowl and a subsidised sandwich.

"Nutrition is the wellbeing lever employers understand least — and touch most often."

How the £138bn actually breaks down

The headline figure hides two very different cost lines. Absenteeism — days simply not worked — is the smaller number. The bulk of the loss is presenteeism: people at their desks, in meetings, on the phone, but operating well below their capable output because they are tired, uncomfortable, distracted or under-fuelled. BHW's methodology asks employees to self-report both, and year after year presenteeism is the larger and more stubborn of the two.

That matters for HR strategy. Absence policies target the smaller line. The bigger prize — recovering usable hours from people who are already at work — sits with the levers that shape daily functioning: sleep, movement and, more directly than any other, what people eat between 8am and 6pm.

The afternoon dip is a data point, not a mood

Research from the Human Appetite Research Unit at the University of Leeds (led for many years by Professor Louise Dye) has shown repeatedly that meals high in refined carbohydrate and low in protein and fibre trigger measurable drops in sustained attention within 90 minutes. Higher-protein, lower-glycaemic meals hold reaction time and working memory steadier through the afternoon.

The UK's National Diet and Nutrition Survey, commissioned by the Office for Health Improvement and Disparities and the Food Standards Agency, shows working-age adults consistently fall short on fibre, oily fish, magnesium and vitamin D — all nutrients linked to fatigue, mood and cognition. None of these are exotic supplement categories. They are the boring middle of a normal weekly shop, and most working adults are quietly under-eating them.

Why this is now an HR problem, not a canteen problem

Deloitte's May 2024 Mental Health and Employers report put the cost of poor mental health to UK employers at £51bn a year, with presenteeism alone accounting for around £24bn. Nutrition, sleep and movement are the three modifiable behaviours most tightly coupled to that presenteeism number — and they all reinforce each other. Better daytime fuelling leads to steadier energy, which leads to less late-night snacking, which leads to better sleep, which leads to better focus the next morning.

The BHW dataset also shows that musculoskeletal complaints — the single largest driver of lost days — track closely with metabolic health markers that diet directly influences. That's why isolating nutrition from the rest of the wellbeing portfolio understates its ROI. It is not one lever among many. It is the lever that quietly lifts several others.

The case for investing now

• Treat food as infrastructure, not perk — and measure it against absence, engagement and self-reported energy.
• Give employees education and tools, not just fruit bowls; behaviour change beats vending-machine swaps.
• Report nutrition alongside mental health and movement in your quarterly wellbeing scorecard.
• Buy from providers who can evidence outcomes, not just recipe counts.
• Track presenteeism, not just absenteeism — the bigger cost lives there.
• Build the business case in lost-days recovered, not perk uptake.

If even a fraction of those 49.7 lost days per employee can be recovered through better daily fuelling, the ROI on a modern workplace nutrition programme is measured in weeks, not years. For a 1,000-person business, recovering just three days per employee a year is 3,000 days of usable output — the equivalent of adding roughly 12 full-time colleagues without a single new hire. That is the number worth taking to your CFO.