Superfoods Case Studies & Practical Application 2 — Questions and Answers
Question 1: A 45-year-old woman with high LDL cholesterol adds 2 tablespoons of ground flaxseed to her morning oatmeal daily. After 3 months, her LDL dropped 10%. Which compound in flaxseed is most responsible?
- Alpha-linolenic acid
- Lignans
- Soluble fiber (beta-glucan) (Correct answer)
- Phytosterols
Correct answer: Soluble fiber (beta-glucan)
Soluble fiber, particularly beta-glucan in oats combined with flaxseed fiber, binds bile acids and reduces LDL cholesterol reabsorption.
Question 2: A marathon runner incorporates tart cherry juice into her recovery routine post-race. The primary evidence-based benefit she would experience is:
- Increased glycogen resynthesis
- Reduced muscle soreness and inflammation (Correct answer)
- Improved hydration status
- Enhanced iron absorption
Correct answer: Reduced muscle soreness and inflammation
Tart cherries are rich in anthocyanins with strong anti-inflammatory properties, clinically shown to reduce post-exercise muscle soreness and speed recovery.
Question 3: A nutrition counselor is designing a meal plan for a client with type 2 diabetes. Which superfood pairing would best help manage postprandial blood glucose spikes?
- White rice with blueberries
- Brown rice with cinnamon and chia seeds (Correct answer)
- Whole wheat pasta with tomato sauce
- Quinoa with avocado
Correct answer: Brown rice with cinnamon and chia seeds
Brown rice provides slow-digesting carbohydrates, chia seeds add soluble fiber that slows glucose absorption, and cinnamon improves insulin sensitivity.
Question 4: An oncology dietitian recommends cruciferous vegetables to a patient in remission from breast cancer. The phytochemical most associated with cancer-protective effects in these vegetables is:
- Lycopene
- Resveratrol
- Sulforaphane (Correct answer)
- Quercetin
Correct answer: Sulforaphane
Sulforaphane, found in broccoli and other cruciferous vegetables, activates phase II detoxification enzymes and has demonstrated anti-cancer properties in studies.
Question 5: A 60-year-old man concerned about cognitive decline begins eating fatty fish twice weekly. After one year, brain imaging shows improved white matter integrity. The most likely protective mechanism is:
- DHA incorporation into neuronal cell membranes (Correct answer)
- EPA reducing systemic blood pressure
- Astaxanthin crossing the blood-brain barrier
- Vitamin D activating neural growth factors
Correct answer: DHA incorporation into neuronal cell membranes
DHA is a structural component of neuronal membranes and myelin sheaths; adequate DHA intake supports white matter integrity and cognitive function.
Question 6: A registered dietitian working with athletes recommends beetroot juice before competition. The ergogenic mechanism relies on:
- High potassium content improving muscle contractions
- Nitrates converting to nitric oxide, improving oxygen efficiency (Correct answer)
- Betaine increasing creatine synthesis
- Betalains reducing oxidative stress during exercise
Correct answer: Nitrates converting to nitric oxide, improving oxygen efficiency
Dietary nitrates in beetroot are converted to nitric oxide, which dilates blood vessels and improves oxygen delivery to muscles, enhancing endurance performance.
Question 7: A patient with iron-deficiency anemia asks about dietary strategies. A dietitian advises pairing plant-based iron sources with vitamin C-rich foods. Which superfood combination best exemplifies this strategy?
- Spinach salad with lemon juice dressing (Correct answer)
- Kale smoothie with almond milk
- Quinoa bowl with tahini dressing
- Lentil soup with turmeric
Correct answer: Spinach salad with lemon juice dressing
Spinach provides non-heme iron while lemon juice supplies vitamin C, which reduces ferric iron to the more absorbable ferrous form.
Superfoods Case Studies & Practical Application 2
A 45-year-old woman with high LDL cholesterol adds 2 tablespoons of ground flaxseed to her morning oatmeal daily.
After 3 months, her LDL dropped 10%.
Which compound in flaxseed is most responsible?