Browse the evidence

Not consuming healthy foods (ignoring healthiness of food choices) is significantly associated with increased weight gain during lockdown.

Pay attention to the healthiness of your food choices. The study found that ignoring whether food is healthy or not was significantly linked to weight gain. Try to prioritize fruits, vegetables, and lean proteins, even if you are stressed.

Female samples experience significantly greater benefits from dietary interventions for both depression and anxiety symptoms compared to male samples.

If you are female, improving your diet may have a particularly strong positive impact on your mood and anxiety levels. While men also benefit, the evidence suggests women may see greater improvements. This highlights the importance of considering sex-specific factors in dietary interventions for mental health.

A strict low-carbohydrate diet (approx. 20g carbs/day) in obese patients with type 2 diabetes causes significant weight loss primarily through spontaneous reduction in caloric intake, rather than increased metabolic expenditure or water loss.

If you have type 2 diabetes and are obese, switching to a strict low-carb diet (around 20g carbs/day) for two weeks can help you lose weight. You don't need to count calories or exercise more; your body naturally reduces the amount of food you eat. This leads to fat loss without needing to increase your energy expenditure. Note: This was a short-term study, so long-term effects are not confirmed.

A strict low-carbohydrate diet decreases plasma triglyceride and total cholesterol levels in obese patients with type 2 diabetes.

If you are concerned about heart health markers like triglycerides, switching to a low-carb diet (20g carbs/day) for two weeks can significantly lower them. Total cholesterol also dropped, while 'good' (HDL) and 'bad' (LDL) cholesterol levels stayed the same. This suggests that reducing carbs, not just fat, is key to improving these specific lipid markers.

Dietary polyphenols from sources like coffee, tea, berries, and cocoa may improve glycemic control and insulin sensitivity through multiple mechanisms, including inhibition of carbohydrate-digesting enzymes, modulation of gut microbiota, and activation of AMPK, although human clinical trial results are inconsistent.

Incorporate polyphenol-rich foods like coffee, tea, berries, and dark chocolate into your diet as part of a balanced approach to health. Do not rely on them as a primary treatment for diabetes or pre-diabetes, as clinical evidence is mixed. Focus on overall dietary patterns and lifestyle factors for significant glycemic control.

A high-protein diet (30% protein) may offer minor differential improvements in lipid profiles (specifically maintaining HDL-C) and postprandial glucose response compared to a low-protein diet during energy restriction, but does not improve reproductive outcomes.

If you are following a weight loss diet for PCOS, choosing a higher protein intake (around 30% of calories) might help preserve your 'good' cholesterol (HDL) and blunt post-meal blood sugar spikes compared to a lower protein diet. However, this is a minor benefit compared to the main goal of losing weight.

A low-protein diet (15% protein) during the weight maintenance phase may lead to a deterioration in the Free Androgen Index (FAI) compared to a high-protein diet, potentially reversing some metabolic benefits achieved during weight loss.

When you stop dieting and start maintaining your weight, be careful with very low-protein diets. This study suggests that a low-protein diet might cause your androgen levels (like testosterone) to creep back up, undoing some of the hormonal benefits you gained from weight loss. Keeping protein intake moderate to high may help maintain these improvements.

Higher household availability of ultra-processed food products is positively and independently associated with higher average BMI and increased prevalence of obesity across all age groups.

Focus on reducing the availability of ultra-processed foods in your home. These are industrial formulations with little whole food (e.g., soft drinks, packaged snacks, instant noodles). The study shows that higher availability of these items is linked to higher obesity rates, independent of other factors. Simple processed foods (like canned vegetables or cheese) do not show the same association. Public health policy should target the production and consumption of these ultra-processed items.

Higher time spent in sedentary behavior is associated with a 73% increased odds of metabolic syndrome in adults, independent of physical activity levels.

If you spend a lot of time sitting, your risk of metabolic syndrome is significantly higher, regardless of how much you exercise. To lower this risk, actively reduce your total sitting time (e.g., stand up more, take walking breaks) in addition to maintaining an active lifestyle.

Roux-en-Y gastric bypass (RY-GBP) surgery significantly enhances postprandial secretion of incretins (GLP-1 and GIP) and restores the incretin effect on insulin secretion within one month, independent of significant weight loss.

For patients with type 2 diabetes undergoing Rou-en-Y gastric bypass, the surgery triggers a rapid increase in gut hormones (GLP-1 and GIP) that significantly improves insulin secretion within one month. This hormonal shift is a key driver of early diabetes remission, occurring before significant weight loss is achieved. This mechanism supports the development of non-surgical therapies that target these same incretin pathways.

HIIE significantly improves insulin sensitivity and lowers fasting insulin levels, with effects lasting up to 72 hours post-exercise in some protocols.

For individuals with insulin resistance or Type 2 Diabetes, incorporating short bursts of high-intensity cycling (HIIE) can significantly improve how your body handles insulin, potentially reducing medication needs or improving metabolic health. This benefit appears to last for several days after the exercise session.

Resveratrol acts as a SIRT1 activator to inhibit NF-κB activation and suppress proinflammatory molecules (IL-1β, IL-6) in a dose-dependent manner, thereby inhibiting inflamm-aging.

Resveratrol is a supplement that activates SIRT1, which helps turn off inflammatory pathways like NF-κB. While effective in cell studies, specific dosing for humans is not defined in this review, so consult a healthcare provider before use.

Most adults attempting weight loss do not use the recommended combination of reducing calorie intake and engaging in at least 150 minutes of leisure-time physical activity per week.

If you are trying to lose weight, relying on just one strategy (like cutting fat or just walking) is likely to fail. You must combine a caloric deficit with at least 150 minutes of moderate physical activity per week. Most people fail because they do not do both.

Women are significantly more likely than men to attempt weight loss, even at normal BMI levels, suggesting societal pressure toward thinness is a primary driver.

Women are more likely to try to lose weight than men, even if they are already at a healthy weight. This is likely due to societal pressure. Focus on health metrics rather than just weight if you are a normal-weight woman.

Saturated fat intake interacts with genetic variants (such as APOE4, APOA2, and obesity genetic risk scores) to modulate cardiovascular risk and obesity, suggesting that personalized dietary recommendations based on genetics may be beneficial for specific subgroups.

If you have a family history of high cholesterol or heart disease, you might be more sensitive to saturated fat. Consider getting genetic testing or consulting a professional to see if a lower saturated fat diet is beneficial for you, especially if you carry the APOE4 gene.

Vitamin D supplementation at moderate to high doses (approximately 1000 IU/d or higher) may reduce the risk of cardiovascular disease (CVD) events, whereas calcium supplementation appears to have minimal or no effect on CVD risk.

If you are considering Vitamin D for heart health, standard low doses (400 IU) may not be enough. Current evidence suggests moderate to high doses (around 1000 IU/day) might offer a slight reduction in cardiovascular risk, though the results are not definitive. Calcium supplements do not appear to help prevent heart disease and should not be taken for that purpose alone. Consult your doctor before increasing Vitamin D dosage.

Eight weeks of resistance exercise reduces intrahepatic lipid (liver fat) by approximately 13% in adults with non-alcoholic fatty liver disease (NAFLD) without causing any change in body weight or visceral fat.

If you have fatty liver, you do not need to lose weight to start improving your liver health. Start a resistance training program (lifting weights) 3 times a week. Focus on progressive overload (lifting heavier over time) rather than burning calories through cardio. You will likely see improvements in liver fat and insulin sensitivity even if the scale stays exactly the same.

Schools can improve student nutrition and maintain financial viability by restricting competitive foods and enhancing the quality of reimbursable school meals.

Schools should replace unhealthy competitive foods (like soda and chips) with healthier alternatives rather than removing them entirely. This strategy can maintain or increase revenue by encouraging more students to purchase reimbursable school meals, thereby supporting both student health and school budgets.

Regular moderate physical exercise acts as an antioxidant by upregulating endogenous defense systems (enzymes and non-enzymatic antioxidants), thereby protecting against oxidative stress and age-related decline.

Engage in regular, moderate physical activity (like walking or cycling) consistently. This trains your body to produce its own antioxidants, protecting you from aging and disease, rather than relying on supplements to fix damage from overexertion.

Supplementation with specific polyphenols (quercetin, resveratrol, curcumin) activates SIRT1, which modulates AMPK and mTOR pathways to support mitochondrial biogenesis and reduce oxidative stress.

If you are an endurance athlete, consider quercetin supplementation (1000mg/day) for 6 weeks to potentially reduce markers of oxidative stress (MDA). However, prioritize regular exercise as the primary driver of health.

Strenuous or excessive exercise without proper training adaptation can be detrimental, leading to increased oxidative stress, hormonal imbalance, and immune suppression.

Avoid excessive exercise if you are untrained. Start with moderate activity and progress gradually to allow your body to adapt and detoxify ROS effectively, preventing negative hormonal and immune effects.

Multisensory wearable sleep trackers (using HR, HRV, temperature, and motion) offer improved sleep stage classification (light, deep, REM) compared to motion-only devices, but still struggle with accurate wake detection and slow-wave sleep classification.

Multisensory wearables are better at distinguishing sleep stages than older models, but they are still not accurate enough for medical diagnosis. Use them to track general trends, not specific sleep stage durations.

Higher adherence to a Mediterranean dietary pattern is associated with slower cognitive decline and a reduced risk of developing Alzheimer's disease in older adults.

To support cognitive health and reduce Alzheimer's risk, adopt a Mediterranean-style diet. This means eating plenty of fruits, vegetables, cereals, legumes, and fish, using olive oil as your main fat source, and limiting red meat and saturated fats. While you don't need to track every gram, aiming for high adherence to this pattern is associated with slower cognitive decline in older adults.

Dietary resistant starch increases the production of satiety hormones GLP-1 and PYY, contributing to reduced adiposity and improved insulin sensitivity.

Incorporate resistant starches like cooled potatoes, legumes, or high-amylose maize flour into your diet. Start with small amounts to minimize digestive discomfort. This can help improve insulin sensitivity and promote satiety through natural hormone production.