Browse the evidence

Modifying dietary fat by replacing saturated fats with unsaturated fats reduces the risk of combined cardiovascular events by approximately 14% in adults, whereas simply reducing total fat intake without modification does not significantly reduce cardiovascular risk.

To lower your risk of heart disease, focus on the quality of your fats rather than just the quantity. Replace saturated fats (found in animal products) with unsaturated fats (found in plant oils and spreads). Simply cutting down on total fat without changing the types of fats you eat does not appear to reduce cardiovascular risk. Aim to maintain this modified diet for at least two years for the best results.

Rapid increases in training load can cause immunosuppression, increasing illness risk if the athlete does not return to baseline within 7-21 days.

After a period of intense training, allow yourself 7-21 days to recover. If you don't feel back to baseline, you are at higher risk of illness. Monitor your health closely during this window.

Individual characteristics such as fitness, body composition, injury history, and age significantly impact internal training loads and susceptibility to injury/illness.

Don't copy your teammate's load. Your injury history, age, and fitness level mean you have a unique tolerance. Use personal data to guide your training, not others'.

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.

Regular exercise induces adverse metabolic responses (worsening of cardiovascular or diabetes risk factors) in approximately 8-13% of individuals, affecting fasting insulin, systolic blood pressure, triglycerides, and HDL-cholesterol.

If you have been exercising regularly and your blood pressure, cholesterol, or blood sugar markers are getting worse instead of better, do not stop exercising. This is a known phenomenon affecting about 1 in 10 people. Consult a healthcare provider or exercise physiologist to identify if you are an 'adverse responder' and adjust your exercise type or intensity, as standard protocols may not be optimal for your specific metabolic profile.

Acute ingestion of 75g glucose reduces regional cerebral blood flow (CBF) in appetite and reward-regulating brain regions (hypothalamus, striatum, insula), whereas fructose fails to produce this deactivation, suggesting glucose promotes satiety signaling while fructose does not.

Eating 75g of glucose triggers brain signals that reduce activity in areas controlling hunger and reward, promoting a feeling of fullness. Eating the same amount of fructose does not trigger these specific brain satiety signals, which may explain why high-fructose diets are associated with increased food intake and weight gain.

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.

Short-term aerobic exercise (12 weeks, 3 sessions/week) improves immediate and delayed memory, increases resting cerebral blood flow in the anterior cingulate and hippocampus, and enhances cardiovascular fitness in sedentary adults aged 57-75.

If you are a sedentary adult over 57, start with 3 one-hour aerobic sessions per week (walking or cycling) at a moderate intensity (50-75% of your max heart rate). You can expect improvements in memory and brain blood flow within 3 months, which may help counter age-related cognitive decline.

The ER22/23EK polymorphism in the glucocorticoid receptor gene confers relative resistance to glucocorticoids, resulting in a healthier metabolic profile characterized by lower fasting insulin, increased insulin sensitivity, and lower cholesterol levels.

If you carry the ER22/23EK variant, your body naturally handles glucocorticoids differently, leading to better insulin sensitivity and lower cholesterol. This is a protective genetic factor. Focus on maintaining this advantage through standard healthy living, as your biology already supports a favorable metabolic profile compared to non-carriers.

The ER22/23EK polymorphism is associated with increased lean body mass and muscle strength in young adult males, and reduced abdominal fat measures in young adult females, due to relative glucocorticoid resistance.

For young adults carrying the ER22/23EK variant, your body composition may naturally favor higher muscle mass in men and lower abdominal fat in women. This is a genetic advantage. Focus on resistance training to maximize this potential in men, and maintain a healthy lifestyle to preserve this favorable fat distribution in women.

Higher dietary intake of six specific flavonoid classes (flavonols, anthocyanidins, proanthocyanidins, flavones, flavanones, and flavan-3-ols) is inversely associated with the risk of cardiovascular disease (CVD).

To support cardiovascular health, aim for a diet rich in foods containing flavonoids. This includes fruits, vegetables, tea, and red wine. Specific classes like flavonols (found in onions, kale), anthocyanidins (berries), and flavan-3-ols (cocoa, tea) are linked to lower CVD risk. You do not need to track specific milligrams, but ensuring variety in plant-based foods is key.

An incremental increase of 10 mg/day in flavonol intake is associated with a 5% reduction in CVD risk.

Increasing your daily flavonol intake by just 10 mg (e.g., adding a small serving of onions or berries) is associated with a modest 5% lower risk of heart disease. Small, consistent dietary additions matter.

Cold exposure activates brown adipose tissue (BAT) in a subset of adults, significantly increasing energy expenditure and thermogenesis, but this response is strongly inhibited by high body mass index (BMI) and body fat percentage.

If you have detectable brown fat, exposing your body to cold (like a cool room or shower) will significantly increase your calorie burn. However, if you are obese, your body's ability to do this is blunted. You might not feel the 'burn' or see the same metabolic spike as a lean person, but the mechanism is still there in some individuals. Focus on maintaining or building metabolic health rather than relying solely on cold for weight loss if you are obese.

Aging causes anabolic resistance to protein intake, characterized by a blunted muscle protein synthetic response to amino acids, which contributes to sarcopenia.

As you age, your muscles become less sensitive to protein. To build or maintain muscle, you likely need to consume more protein per meal (specifically leucine-rich sources) or time it precisely around exercise, rather than just eating the standard amount spread out.

Increasing the leucine content of meals can compensate for the blunted muscle protein synthetic response in the elderly.

Ensure your protein sources are rich in leucine (e.g., whey, eggs, meat) or consider leucine supplementation to maximize muscle building signals.

A single night of partial sleep restriction (4 hours) induces insulin resistance in healthy subjects by reducing both hepatic and peripheral insulin sensitivity.

If you only get 4 hours of sleep, expect your body to handle glucose less efficiently the next day, even if you are healthy and lean. This means your blood sugar may stay higher after meals, and your body is less effective at storing glucose in muscles. Prioritize sleep duration to maintain metabolic health.

Consuming fish 1 to 3 times per month is associated with a significantly reduced risk of ischemic stroke compared to never consuming fish or eating it less than once per month.

To lower your risk of ischemic stroke, you do not need to eat fish daily. Eating fish just 1 to 3 times a month is associated with a significantly lower risk compared to not eating fish. This benefit is likely due to omega-3 fatty acids found in fish. While fish oil supplements exist, the study suggests eating whole fish is preferable due to potential synergistic nutrients.

High fish consumption (>=5 times per week) is associated with a 31% lower risk of total stroke compared to low/non-consumers, with the strongest protective effect seen at this highest intake level.

Eating fish 5 or more times a week is associated with the greatest reduction in total stroke risk (31% lower risk). However, you do not need to reach this high frequency to see benefits; even eating fish 1-3 times a month lowers the risk of ischemic stroke. If you can afford and access fish regularly, aiming for 5+ times a week offers the maximum protective effect observed in this study.

The Edmonton Obesity Staging System (EOSS) score is a stronger predictor of all-cause mortality than BMI classification alone, independently predicting increased mortality risk even after adjusting for metabolic syndrome and hypertriglyceridemic waist.

If you have overweight or obesity, your risk of death is better predicted by your overall health status (like blood pressure, diabetes, or mobility) than by your BMI alone. Doctors should use a comprehensive staging system (like EOSS) to assess your risk and prioritize treatments, rather than relying solely on weight metrics.

Prepregnancy consumption of high dietary fiber (specifically cereal and fruit) and low dietary glycemic load is associated with a significantly reduced risk of developing gestational diabetes mellitus (GDM).

To lower your risk of gestational diabetes before and during pregnancy, prioritize foods high in fiber, specifically from cereal (whole grains) and fruit sources, while minimizing foods that cause rapid spikes in blood sugar (high glycemic load). Aim for at least 10g more of total fiber or 5g more of cereal/fruit fiber per day as part of your pre-pregnancy diet.

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.

Female reproductive function (menarche and ovulatory cycles) requires a critical minimum body fat percentage (approximately 17% for menarche onset and 22% for cycle maintenance), below which hypothalamic dysfunction causes amenorrhea.

If you are female and experiencing irregular periods or amenorrhea, check your body fat percentage, not just your weight. If your body fat drops below ~17-22%, your reproductive system may shut down. To restore cycles, you likely need to gain fat or reduce exercise intensity, even if your total body weight remains the same.