🫀 Nutrition & Diet Trivia Questions & Answers
Vitamins, calories, macros and what food actually does inside you. Below are 30 free nutrition & diet trivia questions with answers — part of Health trivia on BUZZ. Want a real challenge that adapts to what you know? Play the Health quiz — no signup needed to start.
30 Nutrition & Diet trivia questions
Q1. Which fruit-derived vitamin was the missing piece that finally stopped sailors dying of scurvy?
Answer: Vitamin C
💡 In 1747, ship surgeon James Lind ran one of the first controlled trials in medical history, giving sick sailors different remedies — only citrus fruit worked.
Q2. Bananas are famous for being loaded with which mineral that helps muscles and nerves fire properly?
Answer: Potassium
💡 A medium banana carries roughly 400 milligrams of potassium — about a tenth of what most adults need in a day.
Q3. Which classic energy-drink ingredient can still linger in your system hours after a coffee?
Answer: Caffeine
💡 Caffeine's half-life averages around 5 hours, so a portion of your last cup can still be circulating well into the evening.
Q4. Carrots and sweet potatoes owe their color to beta-carotene, converted into which essential vitamin?
Answer: Vitamin A
💡 The conversion happens right in your small intestine, turning the orange pigment into a form your eyes and immune system can actually use.
Q5. Your own enzymes can't break down dietary fiber — what actually processes most of it in your colon?
Answer: Bacteria in your gut
💡 That fermentation produces short-chain fatty acids that your gut lining actually uses as fuel.
Q6. Which macronutrient packs about 9 calories per gram, over double the others?
Answer: Fat
💡 Carbs and protein each supply about 4 calories per gram by comparison.
Q7. Name the metric energy unit, alongside the calorie, printed on food labels worldwide.
Answer: Kilojoule
💡 One food Calorie converts to roughly 4.2 kilojoules.
Q8. Which enzyme in your saliva starts breaking down starch the second food hits your mouth?
Answer: Amylase
💡 It's why plain rice or bread can start tasting faintly sweet the longer you chew — amylase is already converting starch into sugar.
Q9. Sunlight on your skin triggers your body to manufacture which vitamin almost entirely on its own?
Answer: Vitamin D
💡 UVB rays convert a cholesterol-like compound in your skin into vitamin D3 — this route supplies most people with the majority of their vitamin D.
Q10. About how much of your entire body weight is made up of plain water?
Answer: Around 60%
💡 The exact figure shifts with age and muscle mass — since muscle holds far more water than fat tissue does.
Q11. Roughly how many trillion bacterial cells live in a typical human gut, per modern estimates?
Answer: About 38 trillion
💡 That figure is close to the estimated number of human cells in your body — scientists once thought gut bacteria outnumbered us 10 to 1, but that older estimate has been revised.
Q12. Roughly what share of the world's adults have at least some trouble fully digesting milk sugar?
Answer: About two-thirds
💡 The ability to digest milk into adulthood is actually the genetic exception, not the rule — it evolved recently in a few dairy-herding populations.
Q13. Which of these hormones does your stomach release to tell your brain it's time to eat?
Answer: Ghrelin
💡 Its counterpart, leptin, is made by fat cells and does the opposite job — signaling that you're full.
Q14. Which fiber type dissolves in water, slowing digestion by forming a gel?
Answer: Soluble fiber
💡 It also feeds beneficial gut bacteria as it moves through your digestive tract.
Q15. Which stomach enzyme, activated by acid, starts breaking dietary protein into peptides?
Answer: Pepsin
💡 It only works in the stomach's acidic environment and shuts off once food reaches the gut.
Q16. About what share of your body's calcium is locked away in bones and teeth?
Answer: About 99%
💡 The remaining sliver circulates in blood, where it helps muscles and nerves function.
Q17. Omega-3 and omega-6 fats are called 'essential' because your body can't do what with them?
Answer: Make them itself
💡 Without the right enzymes, humans simply can't build these fats from scratch.
Q18. Name the term for nutrients like vitamins and minerals, needed only in tiny amounts.
Answer: Micronutrients
💡 They're the counterpart to macronutrients — carbs, protein, and fat — needed in much larger amounts.
Q19. Chili peppers taste hot because capsaicin tricks the nerve receptor that normally warns of what?
Answer: Actual heat
💡 The receptor is called TRPV1, and it fires at genuine burn-level temperatures — capsaicin just flips the same switch at room temperature.
Q20. What finger-like projections line your small intestine, expanding its area for absorbing nutrients?
Answer: Villi
💡 Thanks to villi and even smaller microvilli, the small intestine's absorbing surface unfolds to roughly the size of a tennis court.
Q21. Humans share a strange quirk with guinea pigs and fruit bats — what can't any of them do?
Answer: Make their own vitamin C
💡 Most mammals manufacture their own vitamin C internally — humans, apes, and a handful of other species lost that enzyme through evolution.
Q22. In 1908, a Japanese chemist named a fifth basic taste beyond sweet, sour, salty, and bitter — what?
Answer: Umami
💡 He'd isolated glutamate, the same compound behind MSG, and coined the word from the Japanese for 'deliciousness.'
Q23. Which fiber type stays intact through digestion, adding bulk that speeds things along?
Answer: Insoluble fiber
💡 It passes through the gut largely unchanged, unlike gel-forming soluble fiber.
Q24. Just existing at rest, your basal metabolic rate burns roughly what share of daily calories?
Answer: About 60-75%
💡 Digesting food and moving around make up most of the rest.
Q25. Which 19th-century energy system still underlies the calorie counts on food labels?
Answer: The Atwater system
💡 It assigns 4 calories per gram to carbs and protein, and 9 to fat.
Q26. Roughly what share of the body's iron is bound up in oxygen-carrying hemoglobin?
Answer: About 70%
💡 Most of the rest is held in reserve inside a storage protein called ferritin.
Q27. Name the score that ranks how quickly a carbohydrate food raises blood sugar.
Answer: Glycemic index
💡 Researchers at the University of Toronto first published the concept in 1981.
Q28. Which B vitamin is essential for forming a growing baby's neural tube during pregnancy?
Answer: Folate
💡 A deficiency in early pregnancy is linked to neural tube defects like spina bifida.
Q29. Which vitamin deficiency, tied to polished-rice diets, causes the disease beriberi?
Answer: Thiamine (Vitamin B1)
💡 It was the first human disease ever officially traced to a nutrient deficiency.
Q30. Which vitamin deficiency, common in corn-heavy diets, causes the disease pellagra?
Answer: Niacin (Vitamin B3)
💡 Corn does contain niacin, but in a chemically bound form the body can't absorb.
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