Which vitamin does the body make when skin is exposed to sunlight?
AnswerVitamin D
Skin produces vitamin D when exposed to UVB light.
Food · Facts & stats
Nutrition facts & stats
7 fact-checked facts about nutrition, nutrients and everyday eating, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Oranges are best known as a source of which vitamin?
AnswerVitamin C
Citrus fruits like oranges are classic sources of vitamin C.
Going deeper
About how many calories are in one gram of protein?
Answer4
Protein supplies about 4 calories per gram, the same as carbohydrate.
Which disease was historically common among sailors who lacked vitamin C?
AnswerScurvy
Long voyages without fresh produce caused scurvy, a vitamin C deficiency.
Adding iodine to table salt was introduced mainly to prevent which condition?
AnswerGoiter
Iodized salt was introduced to prevent goiter caused by iodine deficiency.
Expert level
Pellagra is linked to a deficiency of which vitamin?
AnswerNiacin (B3)
Pellagra is caused by too little niacin, vitamin B3.
Which vitamin is essential for normal blood clotting?
AnswerVitamin K
Vitamin K is needed to make several blood-clotting proteins.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round