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Lewis HowesDOCTOR REVEALS 4 Essential Foods YOU NEED To Eat To LIVE LONGER |Dr. Rhonda Patrick & Lewis Howes
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How Psychological Stress Weakens the Immune System
Lewis Howes asks what pandemic-era stress and routine disruption do to the body. Dr. Rhonda Patrick explains that psychological stress and raised cortisol depress immune function while also driving inflammation, and shares her own stress-linked bouts of flu.
- •Psychological stress is known to depress immune function while also causing inflammation
- •Cortisol rises with stress and suppresses the immune system
- •Patrick's flu came during finals week and after her son's birth when she was sleep-deprived
- •Sleep, diet, lifestyle and genetics also affect immune function
Innate vs. Adaptive Immunity and the Role of Microbes
Patrick explains that nobody can fend off every pathogen, and describes the innate and adaptive arms of the immune system. She says microbes, including early-life exposure to dirt and pets, help train and regulate immunity.
- •The innate response uses myeloid cells such as neutrophils, which produce hydrogen peroxide and hypochlorite
- •The adaptive response relies on B and T cells and antibodies to a pathogen already encountered
- •Early-life exposure to dirt and pet dander may help protect against asthma and autoimmune disease
- •The skin and gut microbiomes help regulate the immune system
Feeding the Gut Microbiome with Fermentable Fiber
Patrick describes how gut bacteria ferment certain fibers into short-chain fatty acids that signal T cells, including regulatory T cells that prevent autoimmune attack. She stresses variety in fermentable fiber and distinguishes it from non-fermentable fiber.
- •Short-chain fatty acids act as signals that tell T cells to make regulatory T cells
- •Blueberries, nuts, mushrooms, leafy greens, onions and garlic provide different fermentable fibers
- •Non-fermentable fiber mainly moves material through the intestines
- •Eating only one fiber such as inulin feeds only certain bacteria, so diversity matters
Patrick's Ideal Four-Food Meal: Salmon, Kale, Blueberries, Avocado
Lewis asks what single meal Patrick would sell for good immune and gut health. She picks wild Alaskan salmon, sauteed kale, blueberries and avocado, and explains the omega-3s, lutein, zeaxanthin and sulforaphane in them.
- •Wild Alaskan salmon provides EPA and DHA and is low in mercury, and cooking lowers mercury bioavailability further
- •Kale offers lutein and zeaxanthin, linked to eye health and cognitive function
- •Sulforaphane raises glutathione in plasma and the brain
- •Broccoli sprouts have far more sulforaphane than mature broccoli
Is Kale Harmful? Sulforaphane, Iodine and Thyroid Concerns
Lewis asks about claims that kale is bad for you. Patrick says she has seen no such research, explains the antinutrient argument about iodine and the thyroid, and cites human and animal studies that found no harm.
- •The antinutrient claim says sulforaphane competes with iodine for thyroid transport
- •Short-term human studies showed no effect on thyroid function
- •Animals with hypothyroidism given broccoli sprout extract were not made worse and had better thyroid antioxidant status
- •Iodine deficiency is not a big issue in the United States
- •Harm may arise only from extreme cases such as juicing enormous amounts of kale
Whole Foods vs. Supplements and the Food Matrix
Lewis, a self-described picky eater, asks whether supplements can replace food. Patrick says food holds many compounds beyond single vitamins and describes a nutrient bar study where benefits depended on the whole fiber-containing package, though she still sees a role for multivitamins and fish oil.
- •There are 40 essential micronutrients, and food has many further beneficial compounds
- •Blueberry anthocyanins were linked to improved blood flow to the brain, cognition and memory
- •In Patrick's postdoc bar studies, benefits faded when the fiber matrix was removed
- •She takes a multivitamin and fish oil daily
Conflicting Nutrition Research and How to Weigh Evidence
Lewis asks how to know what to trust amid constant health news. Patrick says dose, statin use and genetics complicate clinical trials, and that confidence comes when epidemiological, randomized and mechanistic evidence converge.
- •Some people need more fish oil because of their genes
- •Some people convert plant omega-3 (ALA) poorly into EPA and DHA
- •Dose and statin use can mask benefits in trials
- •Converging epidemiological, randomized controlled and mechanistic evidence strengthens conclusions
Vegetarian vs. Meat Eater: Mortality, IGF-1 and Lifestyle
Lewis asks whether a healthy vegan or a healthy omnivore would be better off. Patrick says that once obesity, smoking, inactivity and heavy drinking are removed, meat eaters and vegetarians have similar mortality, and she explains the IGF-1 pathway and the importance of exercise.
- •No randomized trial can last decades, so the evidence is largely epidemiological
- •Vegetarians show lower mortality, but the difference disappears after controlling for lifestyle factors
- •Amino acids in meat activate IGF-1, which helps growth and repair but can let damaged cells keep growing
- •Exercise moves IGF-1 into brain and muscle
- •Vegetarians must work to avoid shortfalls such as zinc and B12
Epigenetic Age, Fish and Poultry, and Red Meat Nuance
Asked which meats to choose, Patrick cites epigenetic age research linking fish and poultry, but not red meat, to lower biological age. She says she is not convinced red meat is bad unless a person is obese, and notes that processed meat with nitrites complicates the studies.
- •Epigenetic clocks use DNA methylation patterns to estimate biological age
- •Fish and poultry were associated with lower epigenetic age, red meat was not
- •Red meat studies often lump in processed meats containing nitrites, which can form nitrosamines
- •Red meat's link to type 2 diabetes appeared mostly in people with high BMI
Genetics, Blood Glucose and Foods to Avoid
Patrick explains that genes shape responses to protein and fat, and describes the Weizmann Institute glucose study and her own continuous glucose monitoring. She names refined carbohydrates and sugary drinks as the top things to cut, notes that grapes spike her glucose, and says protein or fiber before sweets can blunt the response.
- •Packaged toddler foods with added sugar spiked her glucose sharply
- •The Weizmann study of 800 people found glucose responses vary with genetics, microbiome and exercise
- •Refined carbohydrates like cereals, white bread, pizza, cookies and sugary beverages are the biggest thing to avoid
- •Magnesium shortfalls and Bruce Ames's triage theory show why micronutrients matter
- •Eating protein or fiber about 10 minutes before sweets lowers the glucose response
Food, Inflammation, Depression and Exercise
Lewis asks how much food affects mental health. Patrick explains that obesity and diets high in saturated fat and refined sugar drive inflammation that reaches the brain, and that aerobic exercise raises BDNF and is an effective anti-inflammatory and remedy for depression.
- •Saturated fat combined with refined sugar causes a strong postprandial inflammatory response
- •Inflammatory molecules cross into the brain and affect dopamine and serotonin signaling and activate microglia
- •Injecting an inflammatory cytokine into a person caused depressive symptoms
- •Aerobic exercise raises BDNF, which supports new neurons and neuroplasticity
- •Hormesis: a little stress produces many beneficial responses, while chronic low-grade stress does not
Self-Love, Sugar Addiction and Healing Depression
Lewis asks whether the self-love movement can discourage change. Patrick says it started from something real but has spiraled into accepting things that can be changed, and she compares sugar withdrawal and dopamine receptor changes to nicotine, saying diet and exercise can improve depression.
- •Patrick says there is a balance between high expectations and accepting what cannot change
- •Refined sugar acts on the dopamine reward pathway in a way similar to controlled substances, though to a lesser degree
- •In nicotine studies dopamine receptors normalize in about three months after quitting
- •Exercise and diet changes, especially combined, can improve depression scores
- •Fat cells produce inflammatory cytokines, and low-grade inflammation drains energy
Obesity, Genetics and Resetting with Long Fasts
Lewis asks whether genes can hold back weight loss. Patrick says many genes regulate obesity, recommends blood biomarkers and genetic testing, and says hormone dysregulation such as insulin and leptin may need a reset, as with her mother-in-law's multi-day fasts.
- •Genes can change how a person responds to protein, fat ratios and carbohydrates
- •Biomarkers such as LDL, hs-CRP, triglycerides and HbA1c can be measured
- •Caloric restriction usually leads to weight loss, but sustainability is the question
- •Her mother-in-law did a three-day and a four-day fast about a month apart and began losing weight
Daily Supplements: Vitamin D, COVID-19 Severity, Fish Oil, Multivitamin
Asked which supplements everyone should take, Patrick, noting she is not giving medical advice, names vitamin D, fish oil and a multivitamin. She spends most of the time on vitamin D, covering deficiency, blood testing and the evidence and hypothesis around COVID-19 severity and ACE2.
- •Vitamin D acts as a hormone regulating about 5% of protein-coding genes, and about 70% of Americans are insufficient
- •Patrick cites 4,000 IU as the tolerable upper intake and says 10,000 IU daily showed no toxicity, but advises a blood test, with 40 to 60 ng/mL ideal
- •There is no direct evidence that vitamin D prevents or treats COVID-19; the link to severity is a hypothesis
- •A pooled analysis of 25 trials found vitamin D cut respiratory infections by 50% in deficient people
- •Fish oil should be high quality and refrigerated, and third-party testing sites can help choose a brand
Three Truths and Definition of Greatness
In closing, Lewis asks his final-questions segment. Patrick's three truths center on micronutrients and exercise as low-hanging fruit for happiness and longevity, plus enjoying what you love, and she defines greatness as honesty.
- •Getting the right micronutrients and exercising is low-hanging fruit for happiness
- •Getting micronutrients from food leads to eating healthier since refined foods have none
- •Take time to enjoy the things you love doing
- •Patrick defines greatness as honesty
