Nutrition Science & Plant-Based Dietetics 2026 Guide

1. What is the fundamental difference between "complete" and "incomplete" proteins in plant-based diets? A) Complete proteins are only found in animals; incomplete proteins in plants. B) Complete proteins contain all nine essential amino acids in adequate amounts; incomplete proteins are deficient in one or more. C) Complete proteins are easier to digest. D) Incomplete proteins do not contain any amino acids. Correct Answer: B) Complete proteins contain all nine essential amino acids in adequate amounts; incomplete proteins are deficient in one or more. 2. Which vitamin is most commonly at risk of deficiency in strict plant-based (vegan) diets without supplementation? A) Vitamin C B) Vitamin B12 (Cobalamin) C) Vitamin E D) Vitamin K Correct Answer: B) Vitamin B12 (Cobalamin) 3. "Bioavailability" in nutrition refers to: A) The total caloric content of a food. B) The proportion of a nutrient that is digested, absorbed, and metabolized by the body. C) The cost of the food product. D) The fiber content of a plant. Correct Answer: B) The proportion of a nutrient that is digested, absorbed, and metabolized by the body. 4. Why is "Heme iron" (from animals) more bioavailable than "Non-heme iron" (from plants)? A) Heme iron is larger. B) Heme iron is absorbed directly via specific receptors, whereas non-heme iron absorption is influenced by inhibitors like phytates and tannins. C) Non-heme iron is toxic. D) Heme iron is not iron at all. Correct Answer: B) Heme iron is absorbed directly via specific receptors, whereas non-heme iron absorption is influenced by inhibitors. 5. Which substance, found in many plant-based foods, can enhance non-heme iron absorption? A) Calcium B) Vitamin C (Ascorbic acid) C) Caffeine D) Fiber Correct Answer: B) Vitamin C (Ascorbic acid) 6. Omega-3 fatty acids are essential. What is the primary plant-based source of ALA (Alpha-linolenic acid)? A) Coconut oil B) Flaxseeds, walnuts, and chia seeds C) Corn oil D) Olive oil Correct Answer: B) Flaxseeds, walnuts, and chia seeds 7. Why is the conversion of ALA to EPA/DHA inefficient in humans? A) The body uses ALA for protein synthesis only. B) The rate-limiting enzyme (delta-6 desaturase) has low efficiency in humans. C) DHA is not needed by the body. D) ALA is destroyed by stomach acid. Correct Answer: B) The rate-limiting enzyme has low efficiency in humans. 8. What is "Protein Complementation"? A) Eating two types of protein at the same time to ensure all essential amino acids are consumed. B) Using supplements to reach protein goals. C) Avoiding protein entirely. D) Mixing protein with carbohydrates. Correct Answer: A) Eating two types of protein at the same time to ensure all essential amino acids are consumed. 9. In 2026, "Precision Nutrition" (Nutrigenomics) focuses on: A) Universal diet plans for everyone. B) Tailoring dietary recommendations based on an individual's genetic profile and metabolic response. C) Reducing the price of food. D) Eliminating carbohydrates. Correct Answer: B) Tailoring dietary recommendations based on an individual's genetic profile and metabolic response. 10. "Phytochemicals" are: A) Hormones created by animals. B) Bioactive compounds in plants that may provide health benefits (e.g., flavonoids, carotenoids). C) Synthetic additives in processed food. D) Types of fats. Correct Answer: B) Bioactive compounds in plants that may provide health benefits. 11. Which plant-based staple is a complete protein? A) Quinoa B) Apple C) Lettuce D) Olive Correct Answer: A) Quinoa 12. "Phytates" (phytic acid) are considered "antinutrients" because they: A) Are poisonous. B) Can bind to minerals like zinc and iron, inhibiting their absorption. C) Prevent protein digestion completely. D) Add calories without nutrition. Correct Answer: B) Can bind to minerals like zinc and iron, inhibiting their absorption. 13. Which process can reduce the content of antinutrients like phytates and lectins in legumes? A) Freezing B) Soaking, sprouting, or cooking. C) Microwaving D) Drying Correct Answer: B) Soaking, sprouting, or cooking. 14. What is the role of the "Gut Microbiome" in plant-based nutrition? A) It is irrelevant to digestion. B) It ferments plant fibers (prebiotics) into short-chain fatty acids (SCFAs) like butyrate, which support colon health. C) It destroys all vitamins in food. D) It only processes animal fats. Correct Answer: B) It ferments plant fibers into short-chain fatty acids (SCFAs) which support colon health.