Browse the evidence

Primary care behavioral counseling interventions targeting diet and physical activity produce small, statistically significant improvements in intermediate cardiovascular risk factors (blood pressure, cholesterol, BMI) in adults without known CVD risk factors, but do not consistently improve long-term health outcomes like mortality or morbidity.

If you are generally healthy, talking to your doctor about diet and exercise will likely lower your blood pressure and cholesterol slightly. However, do not expect this counseling alone to prevent heart attacks or death. The benefits are modest and require sustained effort (high-intensity counseling yields better results).

EPA reduces cardiovascular risk through multiple mechanisms including lowering triglycerides, reducing inflammation, stabilizing cell membranes, and improving endothelial function, distinct from DHA.

EPA works by lowering triglycerides, reducing inflammation, and stabilizing cell membranes, which together protect the heart.

DASH and Mediterranean diets reduce systemic inflammation (e.g., hs-CRP, cytokines), which indirectly attenuates neuroinflammation and neurodegeneration.

Focus on reducing systemic inflammation by following anti-inflammatory dietary patterns like DASH or Mediterranean. This helps protect the brain by lowering inflammatory markers like CRP and cytokines.

Direct supplementation with Urolithin A (UA) improves skeletal muscle mitochondrial function and health span in elderly humans, bypassing the need for gut microbiome conversion of dietary precursors.

If you are over 60 and interested in supporting muscle health and mitochondrial function, direct Urolithin A supplementation is a viable option, especially if you do not naturally produce it from your diet. The first human trials show it is safe and improves muscle biomarkers. You do not need to rely on eating pomegranates or berries, as your gut may no longer convert them effectively.

Sleep problems are significantly associated with higher levels of psychological distress (anxiety and depression) across healthcare professionals, the general population, and COVID-19 patients.

If you are experiencing sleep problems during a high-stress period, recognize that this is strongly linked to increased anxiety and depression. Prioritizing sleep hygiene or seeking treatment for sleep issues is not just about rest; it is a critical step in mitigating psychological distress. Treating sleep problems may help reduce psychological distress, and vice versa.

The prevalence of sleep problems is highest among COVID-19 patients (57%), followed by healthcare professionals (31%), and the general population (18%).

Target sleep interventions should prioritize COVID-19 patients and healthcare workers, as they face the highest risk of sleep disruption. For the general public, sleep issues are less prevalent but still significant (1 in 5 people).

Time-restricted eating (TRE), defined as restricting daily caloric intake to a consistent 8–12 hour window, prevents and manages chronic metabolic diseases by aligning nutrient intake with circadian rhythms, independent of caloric restriction.

Restrict your daily food intake to an 8–12 hour window each day. For example, eat all your meals between 8 AM and 4 PM, or 10 AM and 6 PM. Try to keep this window consistent every day. You do not need to count calories or restrict the amount of food you eat, but aligning your eating with your body's natural clock helps regulate blood sugar and metabolism.

Dietary composition (specifically carbohydrate vs. animal fat/protein intake) shapes gut microbiota enterotypes (Prevotella vs. Bacteroides dominance), which in turn influences host health outcomes including inflammation, metabolic disease risk, and immune function via microbial metabolite production.

Focus on the quality and type of carbohydrates and fats in your diet, as these directly shape your gut bacteria. A diet high in fiber/carbs may favor Prevotella, while high animal fat/protein may favor Bacteroides. These shifts affect your inflammation and metabolic health. Personalized nutrition based on your microbiome may be more effective than universal dietary guidelines.

An increase in the proportion of ultraprocessed foods in the diet is associated with a higher risk of all-cause mortality in middle-aged adults.

To lower your risk of early death, try to reduce the percentage of your diet that comes from ultraprocessed foods (like packaged snacks, sugary drinks, and ready meals). Even a small reduction in these items can have a measurable positive impact on your longevity.

High intake of simple carbohydrates (sucrose, fructose) causes rapid deregulation of gut microbiota composition, leading to metabolic dysfunction, whereas complex carbohydrates (fiber, resistant starch) promote beneficial bacteria (Bifidobacterium, Lactobacillus) and short-chain fatty acid (SCFA) production, supporting metabolic health.

Focus on complex carbohydrates like vegetables, whole grains, and legumes rather than sugary foods. Aim for about 30g of fiber daily to support gut bacteria that produce beneficial compounds for your metabolism.

High intake of saturated fatty acids (SFA) promotes gut dysbiosis characterized by increased bile-tolerant anaerobes (Bilophila) and inflammation, whereas polyunsaturated fatty acids (PUFA) support a healthier microbiota profile with higher diversity and beneficial bacteria.

Prioritize sources of unsaturated fats (like nuts, fish, olive oil) over saturated fats (like butter, fatty meats). This shift supports a more diverse and healthy gut microbiome.

Daily consumption of 20g of extra-virgin olive oil (EVOO) containing at least 5mg of hydroxytyrosol (HT) and its derivatives provides cardioprotective benefits, including protection of LDL from oxidative damage, maintenance of normal blood pressure, and anti-inflammatory effects.

To get the heart-protective benefits described, you need to eat about 1.5 tablespoons (20g) of high-quality Extra-Virgin Olive Oil every day. It is not enough to just eat 'olive oil'; it must be Extra-Virgin and contain at least 5mg of hydroxytyrosol and its derivatives. This fits into a Mediterranean diet pattern rich in vegetables and fruits. If you are at high risk for heart disease, this specific intake has been shown to significantly reduce major cardiovascular events compared to a low-fat diet.

The Ketogenic Diet alters gut microbiota composition, increasing beneficial bacteria like Akkermansia and Parabacteriodes, which contributes to anti-seizure and anti-inflammatory effects.

Following a ketogenic diet changes your gut bacteria, increasing beneficial types like Akkermansia and reducing harmful ones. This shift is linked to reduced inflammation and seizure activity. You don't need to take probiotics; the diet itself drives these positive changes.

Acute reduction in daily physical activity (step count) for 2-3 weeks causes significant increases in insulin resistance, intra-abdominal fat, and inflammatory markers in healthy adults, even when dietary intake is maintained.

If you are confined to home, you must actively manage your step count and avoid overeating. Your body loses insulin sensitivity and gains abdominal fat within weeks of inactivity, regardless of whether you change your diet. Keep moving to maintain metabolic health.

Overfeeding combined with physical inactivity exacerbates metabolic deterioration, increasing body mass, fat mass, and worsening lipid profiles more than inactivity alone.

During confinement, if you cannot exercise, you must restrict your calorie intake to match your reduced energy expenditure. Overeating during this time will lead to rapid fat gain and worsened metabolic health.

Vitamin D signaling in innate immune cells (macrophages/dendritic cells) stimulates the intracrine synthesis of 1,25-dihydroxyvitamin D, which directly induces the expression of antimicrobial proteins (cathelicidin, beta-defensin 2) and enhances autophagy to combat intracellular pathogens like Mycobacterium tuberculosis.

Ensure your Vitamin D levels are sufficient, as the immune system needs this nutrient to produce antimicrobial proteins that fight bacteria and viruses. This is not just about bone health; your immune cells actively use Vitamin D to fight infections. If you are deficient, your immune cells cannot effectively produce these protective proteins, regardless of how much you take.

Vitamin D signaling suppresses proinflammatory T helper 1 (Th1) and Th17 cells while inducing immunotolerogenic T-regulatory (Treg) responses, thereby modulating adaptive immunity and reducing inflammation.

If you have an autoimmune condition or chronic inflammation, maintaining adequate Vitamin D levels may help regulate your immune system by reducing harmful inflammation and promoting tolerance. However, do not expect it to cure these conditions, as clinical trials show only modest effects.

Women with PCOS have a significantly higher prevalence of impaired glucose tolerance (IGT) and type 2 diabetes (T2DM) compared to women without PCOS, with the magnitude of risk varying by ethnicity.

If you have PCOS, you are at a significantly higher risk for pre-diabetes and type 2 diabetes than women without PCOS, regardless of your weight. You should undergo regular screening (like an OGTT) as recommended by your doctor, rather than waiting for symptoms to appear.

Fermented dairy products can alleviate lactose intolerance symptoms by degrading lactose through the action of lactase produced by lactic acid bacteria.

If you are lactose intolerant, try eating yogurt or kefir. The bacteria in these foods break down most of the lactose, making them easier to digest than regular milk. Start with small amounts to see how your body reacts.

Consumption of animal-source foods (ASF) by children aged 6-23 months in low- and middle-income countries significantly reduces stunting and improves cognitive development compared to plant-based or starch-heavy diets.

If you live in a region where stunting is common and diets rely heavily on starches, introducing small amounts of animal-source foods (like eggs, milk, or fish) to young children is one of the most effective ways to prevent stunting and support brain development. This is not about overconsumption, but about filling critical nutrient gaps that plant-based diets often miss.

High baseline total cholesterol (TC) is significantly associated with an increased risk of myocardial infarction (MI) in men, whereas associations for LDL-C, triglycerides, and total CVD events disappear after adjusting for confounders like diet and BMI.

For middle-aged men, monitoring Total Cholesterol (TC) is crucial for predicting heart attack risk, potentially more so than LDL-C alone when other health factors are considered. Ensure your TC is managed through a balanced diet and lifestyle, as high levels are strongly linked to myocardial infarction in this demographic.

Fish oil and Eicosapentaenoic Acid (EPA) supplementation (2.0-2.2 g/day EPA and 1.5 g/day DHA) can help preserve skeletal muscle and reduce intramuscular adipose tissue in cancer patients, particularly those with advanced lung or pancreatic cancer.

Cancer patients, especially those with lung or pancreatic cancer, may benefit from fish oil supplements providing 2-2.2g of EPA and 1.5g of DHA daily. This can help preserve muscle mass and reduce harmful intramuscular fat during chemotherapy.

Female skeletal muscle exhibits greater fatigue resistance than male skeletal muscle when subjected to equivalent high-intensity exercise dosages, primarily due to a higher proportion of type I muscle fibers and greater oxidative capacity.

When prescribing high-intensity exercise, recognize that women may sustain effort longer or recover faster from fatigue than men at the same relative intensity. This is due to their muscle composition favoring oxidative metabolism. Training programs should account for this by potentially adjusting recovery periods or intensity progression based on individual fatigue markers rather than assuming male-centric norms.

Females have a higher Critical Power (CP) relative to single-limb isometric exercise intensity compared to males, but CP is similar between sexes during whole-body exercise when normalized to maximum capacity.

For whole-body exercises like cycling or running, men and women have similar Critical Power relative to their maximum capacity. However, for single-limb tasks, women may have a higher threshold for fatigue. Use metabolic thresholds (like CP) to prescribe intensity rather than fixed percentages of maximums to ensure accurate comparison and training loads.