Portion Sizes: Common Questions
Practical ways to judge how much food is on the plate without weighing it.
Last revised
Portion Sizes: the questions people actually ask, answered from published guidance.
Key takeaways
- Protein portion: 1 palm
- Vegetable portion: 1 or more fists
- Most useful single change: Fill half the plate with vegetables before serving anything else.
- Commonest mistake: Treating hand portions as precise; they are deliberately approximate.
- See a doctor if any of the signs under "When to get help" below apply to you.
What is Portion Sizes?
Practical ways to judge how much food is on the plate without weighing it.
Why does it matter?
Weighing produces better data and worse adherence; hand-based portions scale with body size and survive restaurants.
Protein portion for Portion Sizes?
1 palm.
Vegetable portion for Portion Sizes?
1 or more fists.
Starchy carbohydrate portion for Portion Sizes?
1 cupped hand.
Fat portion for Portion Sizes?
1 thumb.
What is the single most useful thing to do?
Fill half the plate with vegetables before serving anything else.
What is the most common mistake?
Treating hand portions as precise; they are deliberately approximate.
When should I see a doctor?
Speak to a GP or dietitian rather than using general portion guidance if you have diabetes requiring carbohydrate counting, chronic kidney disease, or a history of an eating disorder. If focusing on portions is making you anxious about food, stop and speak to your GP; the Beat helpline is 0808 801 0677.
Where to go next
- The Short Guide to Portion Sizes
- Portion Sizes: Sorting the Evidence From the Noise
- Portion Sizes — the reference entry
- The Evidence on Weight Fluctuation, Without the Hype
- The Evidence on Weight Maintenance, Without the Hype
When to get help
Speak to a GP or dietitian rather than using general portion guidance if you have diabetes requiring carbohydrate counting, chronic kidney disease, or a history of an eating disorder. If focusing on portions is making you anxious about food, stop and speak to your GP; the Beat helpline is 0808 801 0677.
Where this comes from
- NHS — The Eatwell Guide
- British Dietetic Association — portion sizes
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
