Nutrition tends to get filed under personal wellbeing, something for the individual to sort out on their own time. But the evidence tells a different story, and it is one that belongs in a business conversation.
What your people eat has a direct, measurable effect on how well they think and perform. This is not a soft perk. It is a performance input.
The numbers
The research here is more concrete than most people expect.
- Employees with unhealthy diets are around 66% more likely to report lower productivity than those eating plenty of whole grains, fruit and vegetables.
- Some studies link healthier eating to productivity gains of up to around 20%.
- A 2022 study in JAMA Neurology found that diets high in ultra-processed food were associated with a 28% faster rate of cognitive decline.
Whatever the exact figure in your workplace, the direction is clear. Better-fuelled people think and perform better.
Why this matters at work, not just at home
Most of the cost of poor nutrition at work is invisible. It is not people off sick. It is people at their desks in the afternoon fog, making slower decisions and slipping the odd error, after a lunch that set them up to crash.
So what that means is: nutrition is not competing with your other performance priorities. It underpins them.
What a workplace can actually do
You cannot, and should not, police what people eat. But you can shape the environment. Here's what to do:
- Make the easy option the good option. Look at what is in the canteen, the meeting rooms and the vending machine.
- Educate, simply. Most people have never been told why the afternoon slump happens or how to avoid it.
- Support it with coaching, so it becomes habit, not a one-off talk that fades in a fortnight.
The bottom line
If you care about focus, decision quality and afternoon performance, you cannot ignore what fuels them. Diet is a lever on productivity, and it is one most organisations leave completely untouched.
