Q&A with Dr. Greger 16

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• Consuming powdered green tea (matcha) is healthier than brewed tea because it includes the fiber and other compounds found in the discarded tea leaves, provided the source is Japanese to minimize lead exposure.  Copied to clipboard!
• LDL cholesterol should be kept as low as possible, ideally down to the species-normal level of about 25-28 mg/dL, as evidence shows no adverse effects from very low levels and it benefits both heart and brain health.  Copied to clipboard!
• When evaluating dietary advice, one must demand sources from the peer-reviewed medical literature, as expert opinion is the lowest tier of evidence-based medicine, and longevity leaders generally recommend restricting protein intake to recommended levels (0.8g/kg body weight).  Copied to clipboard!

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Carnivore Diet & Vitamin C

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(00:00:35)

• Key Takeaway: Vitamin C deficiency, leading to decreased wound healing, can manifest within weeks on a cooked meat-only (carnivore) diet because cooking destroys the vitamin C naturally present in raw meat.
• Summary: Vitamin C is found in raw meat, but cooking destroys it, posing a risk on a carnivore diet. Collagen production requires Vitamin C, and deficiency can cause decreased wound healing within weeks. Listeners worried about this deficiency on a carnivore diet should check resources on NutritionFacts.org.

Green Tea Powder vs. Brewed

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(00:02:17)

• Key Takeaway: Consuming green tea as a powder (matcha) is nutritionally superior to brewing because it incorporates all the tea compounds, fiber, and other solids that are typically discarded with brewed tea leaves.
• Summary: Powdered green tea is healthier than brewed tea because it includes the insoluble components thrown away when steeping. This is analogous to eating boiled greens instead of just drinking the water. If consuming powdered tea, Japanese-sourced matcha is recommended over Chinese-sourced due to significantly lower lead levels in the soil.

Green Beans Classification

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(00:04:15)

• Key Takeaway: Green beans are classified as an ‘other vegetable’ category, lacking the specific nutritional properties of true legumes (dried beans) or dark green leafy vegetables.
• Summary: Green beans are not categorized as a ‘green’ (like dark leafy greens) or a ‘bean’ (legume) in the daily design framework. They do not possess the same compounds found in dark green leafy vegetables, nor the nutritional profile of actual dried beans. They remain a healthy vegetable choice.

Freezing Nuts and Seeds

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(00:05:01)

• Key Takeaway: Storing whole flax, pumpkin seeds, sunflower seeds, and walnuts in the freezer or refrigerator has no negative consequences and is recommended to prevent oxidation, especially for more susceptible nuts like walnuts.
• Summary: There are no negatives to storing nuts and seeds in the freezer or fridge. While whole flax seeds can last months at room temperature in an airtight container, other items like walnuts are more susceptible to oxidation. Storing them cold is a safe practice.

Protein Guidelines and Evidence

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(00:05:49)

• Key Takeaway: Conflicting dietary opinions should be resolved by adhering strictly to the best available balance of evidence in peer-reviewed literature, such as the Institute of Medicine’s recommendation of 0.8 grams of protein per kilogram of body weight.
• Summary: Dr. Greger emphasizes demanding sources for health claims, noting that expert opinion is the lowest tier of evidence. The Institute of Medicine recommends 0.8 grams of protein per healthy kilogram of body weight, which is much lower than high-protein advocates suggest. Longevity leaders also support restricting protein intake for health and longevity.

Safety of Low Cholesterol Levels

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(00:08:14)

• Key Takeaway: There are no apparent negative effects from achieving very low LDL cholesterol levels, even down to single digits achieved by modern drugs, contradicting earlier theoretical concerns about steroid hormone production.
• Summary: The recommendation is to get LDL cholesterol as low as possible, ideally down to the species-normal level of about 25 mg/dL, as the lower the better for longer. Theoretical concerns about low cholesterol impacting steroid hormones were disproven by drugs that drop levels into the single digits without adverse effects. High cholesterol (225+ total) significantly increases the odds of developing amyloid plaques in the brain.

Purple vs. Green Kale Benefits

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(00:09:48)

• Key Takeaway: Purple or red kale offers added benefits due to anthocyanin pigments, which are the same beneficial compounds found in berries associated with improved cognition.
• Summary: Purple kale, also known as red kale, contains anthocyanin pigments that provide benefits beyond those found in standard green kale. These pigments are associated with improved cognition, similar to those found in berries. Listeners should prioritize purple kale if available.

Carb Sensitivity and Sources

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(00:10:42)

• Key Takeaway: The health impact of carbohydrates depends entirely on the source; for those who are ‘carb sensitive’ (experiencing exaggerated blood sugar spikes), healthy sources like legumes should replace refined flour and sugar products.
• Summary: Carbohydrates are neither inherently good nor bad; the source matters (e.g., lentils versus lollipops). If carb sensitive, one should focus on eating healthy carbohydrate sources like legumes while skipping refined flour and sugar products. Fruit or sweet potatoes are better sweet alternatives than candy bars.

Moderation and Sugar Intake

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(00:11:43)

• Key Takeaway: The term ‘moderation’ is often misused by the food industry to mean whatever amount an individual is currently consuming, and excess sugar consumption, even at low levels, increases risks like dental cavities.
• Summary: People subjectively define ‘moderation’ as their current consumption level, which the food industry exploits to promote unhealthy foods. Excess sugar consumption has negative effects, including increasing the risk of dental cavities even at low levels. Whole food sweeteners like date sugar (ground dates) are the best alternative to honey or maple syrup.

Fava Bean Tofu Studies

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(00:14:34)

• Key Takeaway: While fava bean tofu exists due to proteins that create a curdling quality, there are currently no specific studies on its benefits, though it is presumed nutritionally similar to soy tofu.
• Summary: Proteins in various plants, including fava beans, can create tofu-like products. No specific studies on fava bean tofu benefits are known, but it is presumed similar to soy tofu. Eating whole fava beans or soybeans is better than tofu, as tofu production removes some fiber and minerals.

Citrus Peel and Seed Consumption

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(00:15:41)

• Key Takeaway: The beneficial phytonutrients in citrus fruits are concentrated in the zest, not the bitter white pith, and there is insufficient data to recommend consuming citrus seeds.
• Summary: The beneficial citrus phytonutrients are found in the zesty part of the peel, not significantly in the white pith. While seeds of some fruits (like watermelon) are healthy, there is no known data on the benefits or risks of citrus seeds, so picking them out is fine.

Essential Oils vs. Whole Foods

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(00:16:48)

• Key Takeaway: When using plant compounds for health, consuming the whole food form, such as eating lavender flowers or making tea, is encouraged over supplemental extracts where the active ingredients are not fully understood.
• Summary: Dr. Greger encourages using whole food forms of plants, like eating lavender flowers or making tea, rather than essential oil supplements. This preference stems from uncertainty regarding what the ‘active ingredients’ in extracts are and whether the extraction process captures the full benefit.

Flu Shot Rationale and Risk

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(00:17:40)

• Key Takeaway: The flu shot is strongly recommended, especially for older individuals, because preventing the flu also prevents the subsequent dramatic increase in cardiovascular disease risk (like heart attack or stroke) that follows a flu infection.
• Summary: The flu vaccine saves lives partly by preventing the increased cardiovascular risk that follows flu infection, where blood becomes more coagulable. This post-flu cardiovascular event risk may ironically kill more people than the virus itself. While the vaccine typically decreases flu risk by about 30%, it is essential for anyone interacting with other people.

Statins and LDL Lowering

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(00:19:21)

• Key Takeaway: Dr. Greger agrees with Dr. Esselstyn’s use of cholesterol-lowering medications when deemed useful, emphasizing that decisions regarding statins should be based on an individual’s calculated 10-year cardiovascular risk.
• Summary: The new book on LDL lowering includes a section detailing the pros and cons of statins. Decisions about medication should be made based on an individual’s 10-year risk of cardiovascular disease, which can be calculated using various risk calculators. Listeners can use these tools to adjust lifestyle factors to achieve their desired risk level.