Browse the evidence

Consumption of 3-4 cups of coffee per day is associated with the largest reduction in relative risk for all-cause mortality, cardiovascular mortality, and cardiovascular disease compared to non-consumption.

If you drink coffee, 3-4 cups a day appears to offer the greatest protection against early death and heart disease based on current observational data. If you do not drink coffee, this review does not strongly recommend starting, as causation is not proven, but it suggests that moderate consumption is likely safe and potentially beneficial for most adults.

Coffee consumption is associated with a lower risk of several specific cancers (e.g., liver, colorectal) and metabolic conditions (e.g., type 2 diabetes, gout).

Regular coffee consumption is linked to a lower risk of certain cancers and metabolic diseases. This adds to the potential benefits of moderate coffee drinking.

Dietary fat co-ingestion significantly enhances the absorption of quercetin aglycone supplements.

Take quercetin aglycone supplements with a meal containing fat to maximize absorption. Studies show high-fat meals can increase plasma quercetin concentration by 45% compared to fat-free meals.

Omega-3 fatty acid supplementation reduces pro-inflammatory cytokines (e.g., IL-6) and may improve outcomes in viral infections, though excessive inflammation reduction during active infection could potentially be detrimental.

Consider supplementing with Omega-3 fatty acids (1.25-2.5g/day) to help manage inflammation. While generally beneficial, be aware that the timing of supplementation relative to an active infection might matter, as excessive anti-inflammatory effects could theoretically interfere with necessary immune responses.

Intermittent fasting regimens that induce the metabolic switch (shifting from glucose to fatty acid/ketone oxidation) preserve lean muscle mass more effectively than continuous caloric restriction.

If you are trying to lose weight while keeping your muscle, try intermittent fasting. It helps your body switch to burning fat and ketones, which protects your muscle better than just eating less all the time. Make sure you fast long enough (12+ hours) to trigger this switch.

Kefir consumption improves lactose digestion and reduces flatulence severity in individuals with lactose malabsorption, performing similarly to plain yogurt.

If you get bloated or gassy from milk, try kefir. It contains natural enzymes that break down the lactose, so you get the nutrients without the stomach upset. One study showed it caused less gas than milk and was just as easy to handle as yogurt.

Higher protein doses (up to 2 g/kg/day) may be appropriate for persons with severe illness, injury, or pro-inflammatory/catabolic states.

If you have a severe illness, injury, or are in a catabolic state, your protein intake might need to be increased to up to 2 grams per kilogram of body weight, but this should be determined by your healthcare provider.

Zinc supplementation (45 mg elemental Zn gluconate/day for 12 months or 25 mg zinc sulfate/day for 3 months) improves immune function in older adults by increasing activated T helper and cytotoxic T lymphocytes and reducing infection incidence.

If you are an older adult, ensuring adequate zinc intake through supplementation (e.g., 25-45 mg/day) may help boost your immune response and reduce infections, as shown in clinical trials. However, results can vary, so consult a doctor before starting high-dose zinc.

Adherence to a Mediterranean diet (rich in fruits, vegetables, whole grains, legumes, olive oil, and low in red/cured meat) attenuates inflammation and oxidative stress, thereby modulating immunosenescence.

Adopting a Mediterranean-style diet, emphasizing plant-based foods, olive oil, and limiting red meat, can help reduce chronic inflammation associated with aging. This dietary pattern is linked to lower levels of inflammatory markers like CRP and IL-6.

Restoring deficient micronutrients (Vitamins A, C, D, E, B2, B6, B12, folic acid, iron, selenium, zinc) to recommended levels improves immune function and increases resistance to infection.

If you suspect you are deficient in key immune-supporting nutrients (like Vitamin D, Zinc, or Vitamin C), getting your levels checked and restoring them to the recommended range is a proven way to support your immune system. This is especially important for infants, the elderly, and those with restricted diets, as food alone may not provide enough of these specific nutrients to maintain optimal immune defense.

Micronutrient deficiencies (specifically Zinc, Vitamin A, Iron, Selenium) impair both innate and adaptive immune responses, increasing susceptibility to infections like pneumonia, diarrhea, and measles.

Ensure your diet includes sources of Zinc, Vitamin A, Iron, and Selenium, especially if you are caring for young children or are elderly. If you have a restricted diet or known absorption issues, consider that food alone might not be enough to support full immune competence, and professional guidance on supplementation may be beneficial.

Pandemic-related disruptions to daily routines, social isolation, and restricted physical activity increase eating disorder risk by removing protective factors and increasing reliance on maladaptive coping strategies like restrictive or binge eating.

Recognize that the loss of routine and social connection is a major stressor that can trigger disordered eating. Try to recreate simple structures for mealtimes and physical activity, even if you are at home. Seek out digital support networks or telehealth services if you feel isolated or if your eating behaviors are becoming problematic.

Arachidonic acid supplementation affects body composition, muscle function, and power output in strength-training individuals.

If you are strength training, ensuring adequate ARA intake may support muscle function and power output. Since ARA is naturally present in animal products, a balanced diet likely provides sufficient amounts for most athletes.

Vitamin D3 supplementation may significantly reduce diabetes risk in individuals with severe vitamin D insufficiency (baseline <12 ng/mL), although this finding is from a post hoc subgroup analysis.

If you are severely vitamin D deficient (levels <12 ng/mL), supplementation with 4000 IU of Vitamin D3 daily might significantly lower your diabetes risk. However, this was a small subgroup analysis, so consult your doctor to check your levels before relying on this.

Western diets high in refined carbohydrates and sugars cause hyperinsulinemia and insulin resistance, which drive obesity and civilization diseases through increased fat storage, prevented lipolysis, and metabolic distortion, independent of caloric surplus alone.

To manage weight and metabolic health, prioritize reducing refined carbohydrates and sugars found in Western diets. These foods spike insulin, which signals your body to store fat and blocks fat burning. Switching to a diet lower in these high-insulinemic foods may help regulate insulin levels and support weight management.

Short-chain fatty acids (SCFAs), particularly butyrate, produced by gut microbiota fermentation of fiber, have anti-inflammatory properties and improve insulin sensitivity, although their net effect in obesity is complex and context-dependent.

Increase intake of dietary fiber to promote the production of short-chain fatty acids (SCFAs) by gut bacteria, which supports insulin sensitivity and reduces inflammation. Start slowly to minimize digestive discomfort.

Caloric restriction, exercise, and circadian rhythm calibration are health-promoting activities that delay aging and extend healthspan.

To delay aging, incorporate caloric restriction, regular exercise, and consistent circadian rhythms into your routine. These behaviors are proven to extend healthspan.

Physical exercise induces Nrf2-dependent mitochondrial biogenesis in skeletal muscle and the brain, contributing to neuroprotection and metabolic health.

Engage in moderate-intensity physical exercise regularly. This activity triggers the Nrf2 pathway, which increases the number and function of mitochondria in your muscles and brain. This biological upgrade supports energy levels, cognitive function, and resilience against age-related decline.

Acetate administration, whether via oral vinegar, colonic infusion, or microbial fermentation of acetogenic fibers, improves body weight control and insulin sensitivity through mechanisms involving increased energy expenditure, fat oxidation, and the secretion of satiety hormones (GLP-1, PYY).

To leverage acetate for metabolic health, you can consume vinegar (containing acetic acid) or foods rich in acetogenic fibers (like inulin or galacto-oligosaccharides). Studies suggest that 0.75g to 1.5g of acetic acid daily from vinegar may help with modest weight loss and improved fat oxidation in overweight individuals. However, results vary, and targeting the distal colon (via fiber fermentation) might be more effective for hormone secretion than direct acetate absorption in the upper gut. There is no single 'best' dose, and individual response depends on your gut microbiome composition.

Timed food restriction or scheduled meal timing can serve as a potent non-photic zeitgeber to resynchronize peripheral clocks and improve activity rhythms in aged individuals, potentially mitigating age-associated pathologies.

Try eating your meals within a consistent daily window (e.g., 8-10 hours). This regularity acts as a strong time cue for your body's organs, helping to stabilize your sleep and metabolism, especially as you age.

COVID-19 physical distancing restrictions and remote work/schooling lead to increased recreational screen time and decreased physical activity in parents and young children.

During periods of remote work or school, expect increased screen time and decreased physical activity. To counter this, schedule specific times for active play and try to integrate movement into screen-based activities (e.g., active video games) or ensure breaks from screens include physical movement. Focus on maintaining routines rather than achieving pre-pandemic levels of intensity.

COVID-19 restrictions lead to increased consumption of snack foods (chips, cookies) and decreased consumption of fast food/take-out among parents and children.

Expect an increase in snack food consumption during periods of stress or boredom. To mitigate this, keep healthy snacks accessible and involve children in meal preparation. Focus on reducing fast food/take-out by cooking more meals from scratch, which many families found to be a positive change.

Participation in organized sports provides significant psychosocial and behavioral health benefits beyond the physiological effects of physical activity, including reduced alcohol consumption and improved social integration.

If you enjoy organized sports, prioritize them. The social structure and behavioral norms of team sports (like reduced alcohol use) offer health benefits that solo exercise routines often miss.

Polarization of physical activity (high-intensity training combined with high sedentary time) may lead to increased health risks despite meeting physical activity recommendations.

If you do intense workouts, do not sit for the rest of the day. Break up sedentary time with light movement to avoid the health risks associated with 'polarization'.