RDN Cheat Sheet 2026

The 30 highest-yield RDN facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. According to FDA guidelines, what is the maximum time ready-to-eat refrigerated foods can be held after preparation before they must be discarded? → 7 days
2. A hospital RDN is asked to develop a policy for nutrition screening of all inpatients. Which resource would be MOST appropriate to consult first? → The Joint Commission standards and current evidence-based clinical practice guidelines
3. A patient post-Roux-en-Y gastric bypass is at highest risk for deficiency of which nutrient due to bypass of the primary absorption site? → Iron
4. Which mycotoxin, produced by Aspergillus molds, is a potent hepatocarcinogen and a significant food safety concern in corn and peanuts? → Aflatoxin
5. A food frequency questionnaire (FFQ) is BEST suited for which of the following research purposes? → Ranking individuals by dietary exposure in epidemiological studies
6. What is the difference between generic and brand-name drugs? → Generic drugs have the same active ingredient but different name and typically lower cost
7. In a single-blind clinical nutrition trial, which party is unaware of the group assignment? → Only the participants do not know their group assignment
8. Which degree is the minimum requirement to become a Registered Dietitian Nutritionist (RDN)? → Bachelor’s Degree
9. Which of the following is an example of food service management within the RDN scope of practice? → Developing menus that meet nutritional and budgetary requirements for institutions
10. In HACCP, a Critical Control Point (CCP) is best defined as: → A step where control can be applied to prevent or eliminate a food safety hazard
11. An odds ratio (OR) of 0.5 in a case-control study examining dietary fiber intake and colon cancer risk MOST suggests: → High fiber intake is associated with half the odds of developing colon cancer
12. A hospital dietitian is planning menus for immunocompromised patients. Which food should be EXCLUDED due to Listeria risk? → Cold deli meats served without reheating
13. A dietitian is reviewing a client's food diary and notices repeated entries of 'coffee with cream and sugar.' Which assessment step is MOST important next? → Probe for specific quantities, type of cream, and amount of sugar per cup
14. What is the primary purpose of professional certification in Lifecycle Nutrition? → To validate competency and knowledge in the field
15. Which of these is a requirement for dietetics licensure in most U.S. states? → Internship or supervised practice
16. A 24-hour recall is conducted on a Monday. Which factor MOST threatens the representativeness of this recall for habitual intake? → Weekend vs. weekday eating differences
17. Which study approach is most effective for Lifecycle Nutrition material? → Active recall with practice questions
18. When storing foods in a walk-in refrigerator, which storage order from top to bottom is correct according to food safety guidelines? → Ready-to-eat foods → whole seafood → whole cuts of beef → ground meats → whole poultry
19. What is the relationship between theory and practice in Lifecycle Nutrition? → Theory provides the foundation; practice applies it to real situations
20. A patient reports eating 'a handful of almonds' as a snack. Which tool would BEST help convert this to grams? → Food model aids or portion estimation tools
21. Which dietary modification is the primary MNT recommendation for a patient newly diagnosed with nephrotic syndrome? → Sodium restriction to manage edema
22. When should you change an answer on a test? → Only when you have a clear reason the new answer is better
23. What is a side effect? → An unintended effect of a medication beyond its intended action
24. In a randomized controlled trial (RCT), what is the PRIMARY purpose of randomization? → To eliminate selection bias and ensure group comparability
25. When using anthropometric data as part of dietary assessment, which measurement provides the best surrogate for visceral adiposity? → Waist circumference
26. An RDN realizes mid-session that a client's question falls outside their area of competence. What is the appropriate professional response? → Acknowledge the limitation and refer or consult with an appropriate specialist
27. What does 'PRN' mean on a prescription? → As needed
28. What should you do when encountering a difficult question? → Mark it, move on, and return to it later
29. Which foodborne illness is caused by a preformed toxin and typically causes symptoms within 1–6 hours of ingestion, with no fever? → Staphylococcal food poisoning
30. Why is reading the question carefully important? → To avoid misinterpreting what is being asked