CLS Lifestyle Modification & Nutrition Counseling 3 — Questions and Answers
Question 1: Which type of dietary fiber has the greatest evidence for LDL cholesterol reduction?
- Insoluble fiber found in wheat bran
- Soluble viscous fiber found in oats and psyllium (Correct answer)
- Resistant starch from cooked and cooled potatoes
- Cellulose from leafy green vegetables
Correct answer: Soluble viscous fiber found in oats and psyllium
Soluble viscous fibers (beta-glucan from oats, psyllium) bind bile acids in the gut, increasing fecal excretion and reducing hepatic LDL-C, with a well-established evidence base.
Question 2: A patient following a very-low-carbohydrate ketogenic diet shows elevated LDL-C on labs. What is the most likely explanation?
- Ketosis directly stimulates hepatic VLDL overproduction
- High saturated fat intake common in ketogenic diets upregulates LDL receptor degradation (Correct answer)
- Low carbohydrate intake directly inhibits LDL receptor expression
- Ketones suppress bile acid synthesis, reducing LDL clearance
Correct answer: High saturated fat intake common in ketogenic diets upregulates LDL receptor degradation
High saturated fat consumption typical of ketogenic diets increases hepatic PCSK9 activity and reduces LDL receptor expression, leading to elevated plasma LDL-C.
Question 3: Which strategy best helps a patient adhere to long-term dietary changes for lipid management?
- Prescribe a rigid meal plan with zero flexibility
- Use motivational interviewing to align dietary changes with the patient's own values and goals (Correct answer)
- Recommend the most restrictive diet possible for maximum LDL reduction
- Avoid discussing diet since patients rarely comply
Correct answer: Use motivational interviewing to align dietary changes with the patient's own values and goals
Motivational interviewing is an evidence-based counseling approach that improves long-term dietary adherence by exploring patient ambivalence and building intrinsic motivation.
Question 4: Plant sterols and stanols lower LDL cholesterol primarily through which mechanism?
- Inhibiting HMG-CoA reductase in the liver
- Competing with dietary and biliary cholesterol for intestinal absorption (Correct answer)
- Activating LDL receptors on hepatocytes
- Increasing fecal bile acid excretion via viscosity
Correct answer: Competing with dietary and biliary cholesterol for intestinal absorption
Plant sterols and stanols are structural analogs of cholesterol that displace cholesterol from intestinal micelles, reducing its absorption by 30-50%.
Question 5: A 45-year-old sedentary patient with mixed dyslipidemia asks which type of exercise most effectively lowers triglycerides. What is most accurate?
- Resistance training is superior to aerobic exercise for triglyceride reduction
- Aerobic exercise of sufficient duration and intensity is most effective for lowering triglycerides (Correct answer)
- Flexibility exercises such as yoga are equally effective as aerobic exercise
- Short 5-minute walks several times daily are as effective as prolonged aerobic sessions
Correct answer: Aerobic exercise of sufficient duration and intensity is most effective for lowering triglycerides
Sustained aerobic exercise increases lipoprotein lipase activity and reduces hepatic VLDL secretion, making it the most effective exercise modality for triglyceride reduction.
Question 6: Which omega-3 fatty acid has the strongest evidence for reducing cardiovascular events at prescription doses?
- Alpha-linolenic acid (ALA) from flaxseed
- Eicosapentaenoic acid (EPA) as icosapentaenoic acid ethyl ester (Correct answer)
- Docosahexaenoic acid (DHA) from algae supplements
- Linoleic acid from vegetable oils
Correct answer: Eicosapentaenoic acid (EPA) as icosapentaenoic acid ethyl ester
High-dose icosapentaenoic acid (EPA ethyl ester, 4g/day) demonstrated significant CV event reduction in the REDUCE-IT trial, distinct from ALA or DHA alone.
Question 7: A patient with familial hypercholesterolemia asks if lifestyle changes alone can normalize their LDL-C. What is the most appropriate response?
- Lifestyle changes alone are typically sufficient to normalize LDL-C in FH
- Lifestyle changes are important adjuncts but rarely normalize LDL-C in FH; pharmacotherapy is almost always required (Correct answer)
- Diet changes are ineffective in FH because the defect is genetic
- Vigorous exercise can compensate for the LDL receptor defect in FH
Correct answer: Lifestyle changes are important adjuncts but rarely normalize LDL-C in FH; pharmacotherapy is almost always required
In FH, the defective LDL receptor limits the efficacy of lifestyle interventions; while helpful, lifestyle alone typically cannot achieve adequate LDL-C reduction without pharmacotherapy.
CLS Lifestyle Modification & Nutrition Counseling 3
Which type of dietary fiber has the greatest evidence for LDL cholesterol reduction?