Eating well

Understanding Portion Sizes

Portion sizes have grown over time, and eating the right amount for you — even of healthy foods — is key to a balanced diet and healthy weight.

Written by Meds Global Health Clinical Team · Clinically reviewed by Dr Muhammad Suffyan, MB BS, Founder & Clinical Director · Last reviewed · How we review

What it means

Portion size is simply how much of a food you eat at one time. Because portions in packets, restaurants and at home have grown over the years, it is easy to eat more than the body needs without realising.

Why it matters

Even healthy foods provide energy, so consistently large portions can lead to weight gain. Getting portions right helps balance energy, control weight and make sure meals are made up in healthy proportions.

Practical tips

How to make it work

  • Use your hand as a guide: a palm of protein, a fist of vegetables, a cupped handful of carbohydrates, a thumb of fats.
  • Fill about half your plate with vegetables or salad, a quarter with protein, and a quarter with starchy carbohydrates.
  • Use smaller plates and bowls, which naturally reduce how much you serve.
  • Check the serving size on food labels — packets often contain more than one portion.
  • Eat slowly and stop when you feel satisfied rather than full.
  • Avoid eating straight from large packets; put a sensible amount on a plate instead.

Good to know. Portion guides are general — children, very active people and those with certain conditions have different needs. If you are unsure how much you should eat, a GP or dietitian can give tailored advice.

Answers

Understanding Portion Sizes: frequently asked questions

How can I judge a healthy portion without weighing food?

Your hand is a handy guide: a palm-sized amount of protein, a fist of vegetables, a cupped hand of carbohydrates and a thumb of fats. The plate model — half vegetables, a quarter protein, a quarter carbs — also helps.

Can I gain weight eating healthy foods?

Yes. All foods contain energy, so large portions even of healthy foods can lead to weight gain over time. Getting portion sizes right matters alongside choosing nutritious foods.

Related

More on eating well

Mediterranean DietThe Mediterranean diet is a way of eating rich in vegetables, fruit, wholegrains, beans, o…DASH DietThe DASH diet is an eating pattern designed to lower blood pressure, rich in fruit, vegeta…Intermittent FastingIntermittent fasting means cycling between periods of eating and not eating, such as the 5…Low-Carb DietA low-carb diet reduces carbohydrate foods such as bread, rice and sugar in favour of prot…Low-FODMAP DietThe low-FODMAP diet is a short-term, dietitian-led approach to identify which fermentable …Gluten-Free DietA gluten-free diet avoids gluten, a protein in wheat, barley and rye. It is essential for …

Education and reference only. This is general UK health guidance, not personal medical or dietitian advice. If you have a health condition or specific needs, check with your GP, pharmacist or a registered professional before making big changes.

Sources

Where this is drawn from

  • NHS — Eat well & Live Well
  • British Dietetic Association (BDA)
  • UK Scientific Advisory Committee on Nutrition (SACN)

Building health-promotion or lifestyle content?

We create clear, accurate, referenced health explainers, guides and behaviour-change content for teams and learners.

Talk to us ☎ +44 7448 439750
☎ Call Get a Proposal