What are the three main macronutrients in food?
AnswerCarbohydrates, proteins and fats
Carbohydrates, proteins and fats supply most of the energy in our diet.
Food · Facts & stats
My Diet facts & stats
7 fact-checked facts about diet and nutrition, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Food energy is commonly measured in which unit?
AnswerCalories
Food energy is measured in kilocalories, called Calories on labels, or in kilojoules.
Going deeper
Which mineral is a key part of hemoglobin, which carries oxygen in blood?
AnswerIron
Each hemoglobin molecule contains iron atoms that bind oxygen.
Proteins are built from chains of what?
AnswerAmino acids
Proteins are long chains of amino acids folded into specific shapes.
The orange pigment beta-carotene in carrots is converted by the body into which vitamin?
AnswerVitamin A
The body converts beta-carotene into vitamin A, which is needed for vision.
Expert level
In 1747, which Scottish naval surgeon ran an early controlled trial showing citrus fruit treated scurvy?
AnswerJames Lind
James Lind gave sailors different treatments and found those eating oranges and lemons recovered fastest.
How many essential amino acids must adults get from food?
Answer9
Of the 20 standard amino acids, 9 are essential because the body cannot make them.
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