PreventionEvidence-basedLesson 17 of 32

Ultra-processed food and your appetite

In controlled trials, people ate 500 more calories a day on an ultra-processed diet — without meaning to.

4 min+20 XP

The landmark study

In a tightly controlled NIH trial, participants given matched macronutrients ate about 500 more calories daily on the ultra-processed menu and gained weight, while losing weight on the whole-food menu.

Why it happens

Ultra-processed food is engineered for speed and reward: soft textures, high energy density, little fibre and combinations of fat, sugar and salt rarely found in nature. You eat faster and register fullness later.

A practical filter

You don't need perfection. Aim to make most of your plate recognisable as a plant, animal or grain, and treat highly engineered products as occasional rather than default.

Key takeaways

Ultra-processed diets increase intake by around 500 calories a day.
Soft, energy-dense, low-fibre food is eaten faster.
Aim for mostly recognisable whole ingredients, not perfection.

Check your understanding

1 question · answer to earn XP

1. In the NIH trial, how much more did participants eat on the ultra-processed diet?

Evidence & sources

This lesson reflects guidance from recognised health bodies and peer-reviewed research.

For education purposes only — not intended to diagnose, treat or replace medical advice.