New research out yesterday found that fewer than one in four adults know what a recommended portion of fruit or veg should look like.
Only 23 per cent of the 2,000 people quizzed correctly identified that a cupped handful makes up an approximate correct portion of fruit or veg.
More than half of survey respondents chose a difference amount, while 26 per cent admitted they did not know what a portion should look like.
The research was commissioned by the National Charity Partnership, formed by Diabetes UK, the British Heart Foundation and supermarket giant Tesco.
The new figures coincide with the release of the group’s Hands on Healthy Eating campaign, which aims to raise awareness of correct portion sizes.
The initiative will also provide inspiration on ways for people to incorporate more fruit and vegetables into their diets.
Katherine Hale, prevention programme manager for the partnership, said: “This project aims to engage and motivate young families to have healthier portion sizes using interactive activities.
“Data shows this demographic has some of the unhealthiest shopping baskets.”
According to the charity, 4.2 million people are living with type 2 diabetes in the UK, with 11.9 million at “increased risk” of developing the condition.
An estimated seven million people have heart and circulatory diseases.