Some 1.7 million pupils are taking part in "Healthy Eating Week" after a general lack of knowledge about nutrition among Britain's school children was revealed by the British Nutrition Foundation.
The health charity found the majority of 11-16 year olds (52%) believe carbohydrate provides more energy than either fat or protein when fat has more calories.
Children were found to be confused about what went into their five-a-day; more than a fifth of 11-14 year olds and 16% of 14-16-year-olds believe that frozen fruit and vegetables do not count.
One quarter of 11-14 year olds and a fifth of 14-16-year-olds did not think that canned fruit and vegetables count.
However, 85.5% of children aged between 5-16-years-old did know they were supposed to consume five portions of fruit and vegetables every day.
More top news
More than 550 people have been killed in flooding across northern India, Nepal and Bangladesh.
Showers in the north. Fine in the south
A British man was injured in a suspected terror attack in Finland in which two people were killed, the Government has said.