Browse the evidence

High body weight (obesity) causes increased psychological distress and depressive symptoms, primarily through weight stigma and biological mechanisms like HPA-axis dysregulation and systemic inflammation.

If you have obesity, be aware that societal stigma and biological factors like inflammation can contribute to depression. Focus on mental health support and reducing stigma rather than self-blame. Healthcare providers should adopt weight-inclusive attitudes to improve patient wellbeing.

Endurance-based exercise training induces skeletal muscle mitochondrial biogenesis through a hormetic feedback loop triggered by acute disruptions in cellular energy and ionic homeostasis.

To build more mitochondria and improve endurance, you must challenge your body's energy balance. This happens through endurance exercise (like running or cycling) or high-intensity interval training (HIIT). The key is that the exercise must be intense enough to disrupt your muscle's normal energy state (depleting ATP/creatine phosphate and raising AMP/Calcium), which signals your cells to build more mitochondria over time. Consistency and progressive overload are necessary because your body adapts to the stress.

Higher body mass index (BMI) is a strong, linear, and likely causal risk factor for severe COVID-19 outcomes, including hospitalization and death, with risk increasing by approximately 5-10% per kg/m² increase in BMI.

Maintaining a healthy weight is one of the most effective ways to reduce the risk of severe illness from COVID-19. The risk of hospitalization and death increases linearly with BMI. While weight loss is challenging, even modest reductions in weight (e.g., through bariatric surgery or lifestyle changes) have been associated with significantly lower risks of severe outcomes. Public health efforts should prioritize obesity prevention and management as a key strategy to mitigate the impact of the pandemic.

Physical activity reduces the risk of chronic diseases including cardiovascular disease, cancer, and dementia independent of weight loss.

Aim for 10,000 steps a day to lower your risk of heart disease, cancer, and early death. You get these benefits even if you don't lose weight on the scale.

Obesity (BMI ≥ 30 kg/m²) is associated with the highest risk of incident atrial fibrillation and ischemic stroke in young adults (20-39 years), with risk attenuating significantly in those over 60.

Maintain a healthy weight starting in your 20s. The cardiovascular damage from obesity (atrial fibrillation and stroke risk) is most potent when you are young. Waiting until middle age to manage weight misses the window where obesity causes the most severe relative risk increase.

Waist circumference (WC) is a more consistent predictor of atrial fibrillation and stroke risk across all age groups than BMI, which shows a J-shaped or attenuated relationship in the elderly.

Track your waist circumference, not just your weight. For predicting heart rhythm issues and stroke, visceral fat (waist size) is a more reliable indicator across all ages than total body mass (BMI).

Being underweight (BMI < 18.5 kg/m²) is associated with an increased risk of atrial fibrillation, particularly in adults over 60 years.

If you are over 60, do not aim for extreme thinness. Being underweight increases your risk of atrial fibrillation, likely due to loss of muscle mass and malnutrition. Focus on maintaining a healthy, robust weight.

Network meta-analyses (NMA) provide superior clinical utility for diabetes management compared to standard pairwise meta-analyses by simultaneously comparing multiple treatments using both direct and indirect evidence.

When choosing between multiple diabetes medications (like SGLT-2 inhibitors, GLP-1 RAs, or finerenone), rely on Network Meta-Analyses (NMA) rather than single-trial results. NMAs allow you to compare all options simultaneously against standard care, revealing which drugs best reduce specific risks like heart failure or kidney disease for your patient's specific profile.

Interval training (IT) and moderate intensity continuous training (MICT) produce equivalent changes in whole-body fat mass and lean mass when compared directly.

You do not need to train at high intensities to lose fat or build muscle. Moderate intensity continuous training (MICT) is just as effective as interval training (IT) for changing body composition. Choose the intensity you can sustain consistently, as the physiological outcome regarding fat and lean mass is essentially the same.

Higher BMI is associated with increased all-cause mortality in a J-shaped curve, with the lowest mortality risk occurring at a BMI of 20-25 kg/m2 for never-smokers without chronic disease, and increased risk for BMI > 25 kg/m2.

Maintain a BMI between 20 and 25 kg/m2 to minimize your risk of death. If you are a smoker or have a chronic disease, your optimal BMI might be slightly higher, but for the general healthy population, staying in this range is the safest bet for longevity.

Lower grip strength is significantly associated with higher risks of all-cause mortality, cardiovascular disease mortality, respiratory disease mortality, and mortality from specific cancers (colorectal, lung, breast), independent of traditional risk factors.

Measure your grip strength regularly using a dynamometer. If your score is low (below sex-specific thresholds, e.g., <26 kg for men, <16 kg for women), it is a strong signal to review your overall health, including cardiovascular and metabolic markers, even if you feel healthy. Focus on building strength through resistance training, as higher grip strength is linked to lower mortality risk.

The association between lower grip strength and adverse health outcomes is stronger in younger age groups compared to older age groups.

If you are under 55 and have low grip strength, do not dismiss it as 'just being weak.' The risk associated with low strength is actually higher for you than for older adults. Prioritize strength training and medical check-ups.

Healthier nutrient-based diet patterns do not cost significantly more per day than less healthy options, but cost more per 2000 kcal.

If you are trying to eat healthier, expect to pay more per calorie. This meta-analysis confirms that healthier nutrient-based diets cost about $1.56 more per 2000 kcal than less healthy options. However, the cost per day is not significantly different. This suggests that healthy foods are often more nutrient-dense but also more calorie-dense in terms of cost. To mitigate this, focus on affordable healthy staples like grains and dairy, which showed smaller or no price differences, and consider policy-level changes or subsidies to make healthy food more accessible.

Lifestyle factors (smoking, lipids, hypertension, diabetes, obesity, diet, inactivity, alcohol, psychosocial factors) account for over 90% of the risk for acute myocardial infarction and stroke.

Your risk of heart attack or stroke is overwhelmingly determined by your lifestyle, not your genes. Nine key factors—smoking, blood lipids, blood pressure, diabetes, obesity, diet, physical inactivity, alcohol, and psychosocial stress—account for over 90% of this risk. Addressing these factors can drastically reduce your likelihood of these events.

Structured endurance or resistance exercise training induces distinct, comprehensive molecular adaptations across multiple organ systems, serving as the mechanistic basis for health benefits.

This paper establishes that endurance and resistance exercises trigger different molecular pathways. To maximize health benefits, you should incorporate both types of exercise, as they affect different molecular transducers in your muscles, fat, and blood. The specific molecular details are still being mapped, but the structural commitment (12 weeks) is key to seeing these changes.

Increasing cardiorespiratory fitness (CRF) or physical activity (PA) consistently reduces all-cause and cardiovascular mortality risk, whereas intentional weight loss does not consistently reduce mortality risk and may increase it in healthy individuals.

Prioritize increasing your physical activity and cardiorespiratory fitness over focusing on weight loss. Regular exercise provides consistent mortality benefits that are independent of whether you lose weight. If you are overweight or obese, becoming 'fit' significantly lowers your health risks, often more effectively than trying to lose weight alone.

A 10-year intensive lifestyle intervention (caloric restriction and increased physical activity) significantly delays the onset of moderate or severe physical disability and increases disability-free life expectancy in adults with type 2 diabetes, particularly in women and those without cardiovascular disease.

If you have type 2 diabetes, committing to a structured lifestyle program involving calorie-controlled eating and regular physical activity (aiming for ~175 minutes of moderate activity per week) can significantly delay the onset of physical disability. This benefit is particularly pronounced for women and those without existing heart disease. While it may not extend your total lifespan, it can add nearly a year to your life spent free from physical limitations, improving your quality of life in your later years.

The physical function benefits of long-term intensive lifestyle intervention are more pronounced in older adults (≥60 years) compared to younger adults (<60 years).

If you are over 60, the mobility benefits of lifestyle changes may be even more valuable to you than for younger people, as the intervention had a larger effect on physical function scores in this age group.

Interval training (IT) and moderate intensity continuous training (MICT) produce equivalent changes in whole-body fat mass and fat-free mass over time.

If your goal is to change your body composition (lose fat or gain muscle), it does not matter whether you choose high-intensity interval training (HIIT) or moderate-intensity continuous training (MICT). Both approaches yield similar results. Focus on choosing the type of exercise you enjoy and can stick with consistently, as adherence is likely more important than the specific intensity profile for long-term body composition changes.

Consuming processed meat increases the risk of colorectal cancer, with each 50-gram daily increase linked to an 18% higher risk.

To reduce colorectal cancer risk, limit processed meat intake (bacon, sausage, hot dogs, lunch meats). Each 50g daily increase raises risk by 18%. Be aware that 'nitrite-free' labels often use celery juice, which acts as a nitrate source and carries similar risks. Focus on reducing overall processed meat consumption rather than seeking 'safer' processed alternatives.

Unhealthy lifestyle factors (current smoking, low physical activity, and low dietary adherence) increase the risk of myocardial infarction and coronary heart disease, with elevated remnant cholesterol explaining 12-21% of this excess risk.

Your lifestyle choices directly impact a specific type of fat in your blood called remnant cholesterol, which contributes to heart disease risk. Quitting smoking, increasing physical activity, and adhering to dietary guidelines can lower these levels, thereby reducing your risk of heart attack and coronary heart disease. This reduction in risk is partly mediated by the improvement in your remnant cholesterol levels.

Regular physical activity induces systemic molecular adaptations across multiple organ systems, reducing the risk of cardiovascular, metabolic, and mental health diseases through mechanisms involving energy mobilization, structural adaptation, and exerkine signaling.

Make movement a non-negotiable part of your daily routine, not an optional extra. Your body is biologically designed for activity, and regular exercise is one of the most powerful tools you have to prevent heart disease, metabolic issues, and mental health disorders. Focus on consistency across different types of movement (endurance, resistance) to trigger these protective molecular adaptations.

Intensive lifestyle intervention for weight loss in adults with type 2 diabetes does not significantly alter the prevalence of abnormal ankle-brachial index (ABI), but it does significantly reduce interartery systolic blood pressure differences.

For people with type 2 diabetes, losing weight through diet and exercise improves how blood pressure varies between different arteries, which may indicate better vascular health, even if the standard ABI test (used to diagnose peripheral artery disease) doesn't show a change. Stick to the weight loss program for overall cardiovascular benefits.

Obesity is a chronic disease of dysregulated energy balance involving neuroendocrine factors, requiring lifelong, multimodal management (lifestyle, pharmacotherapy, surgery) tailored to individual patient characteristics and evolving goals.

Treat obesity as a chronic disease requiring long-term management. Work with your healthcare provider to create a personalized plan involving lifestyle changes, medications, or surgery based on your specific health needs and goals. Regular follow-up is essential to adjust treatment as your needs change.