Browse the evidence

Maintaining a BMI between 21 and 25 kg/m² is associated with the lowest risk of all-cause and cause-specific mortality (including cancer, cardiovascular, and respiratory diseases) in never-smokers, whereas obesity (BMI ≥30) reduces life expectancy by 3.5–4.2 years compared to healthy weight.

For long-term health and longevity, aim for a BMI between 21 and 25 kg/m². This range is associated with the lowest risk of death from major diseases like cancer and heart conditions. While being 'overweight' (BMI 25-29.9) is not as dangerous as obesity, this study indicates that health risks start to climb once you exceed 25. Avoiding being underweight (<18.5) is equally critical for maximizing life expectancy.

Progressive resistance strength training (PRT) significantly improves physical function, muscle strength, and performance of daily activities in older adults, with large effects on strength and moderate-to-large effects on functional tasks like chair standing.

Engage in progressive resistance training 2-3 times per week using weights, machines, or bands. Start with a weight that challenges you but allows proper form, and gradually increase the resistance as you get stronger. This is one of the most effective ways to maintain independence, strength, and quality of life as you age.

Resistance training counteracts age-related muscle mass and strength loss, improving mobility, physical functioning, and independence in older adults.

Keep moving and lifting. It's not too late to build strength. This will help you do daily tasks easier and stay independent longer.

Mechanical tension, muscle damage, and metabolic stress are the three primary factors responsible for initiating the hypertrophic response to resistance exercise.

Design your workouts to include heavy loads (mechanical tension), exercises that cause some muscle soreness/damage (muscle damage), and sets that leave you pumped with metabolites (metabolic stress). All three contribute to growth.

Combining moderate exercise with dietary weight loss produces significantly greater improvements in physical function, pain, and mobility in older adults with knee osteoarthritis compared to either intervention alone or usual care.

If you are over 60 with knee arthritis and are overweight, doing just diet OR just exercise is not enough to significantly improve your daily function or pain. You must do both. Aim for a 5% weight loss through diet while engaging in 3 days per week of mixed exercise (walking and light resistance). This combination significantly reduces pain and improves your ability to walk and climb stairs, whereas doing either one alone does not show these benefits compared to doing nothing special.

Combining weight loss (via caloric restriction) with exercise produces greater improvements in physical function and frailty reduction in obese older adults than either intervention alone.

If you are an older adult with obesity and some frailty, combining a moderate calorie-reduced diet with regular exercise (both aerobic and resistance) is the most effective way to improve your daily physical function and reduce frailty. Doing just one of these is less effective than doing both together.

In obese older patients with heart failure with preserved ejection fraction (HFPEF), both caloric restriction and aerobic exercise training significantly increase peak oxygen consumption (peak VO2), and their combined effect is additive.

If you are an older adult with heart failure and excess weight, both diet and exercise can significantly improve your stamina (oxygen consumption). Doing both together provides the biggest boost. While there is a common belief that being overweight protects heart failure patients, structured weight loss through diet and exercise is safe and effective for improving your ability to exercise, provided you are clinically stable.

Higher levels of physical activity are associated with a 10-24% lower risk of developing seven specific cancers (colon, breast, kidney, endometrial, bladder, esophageal adenocarcinoma, and stomach/cardia), with evidence strength rated as 'strong' by the Physical Activity Guidelines Advisory Committee.

Engage in regular physical activity, particularly moderate-to-vigorous intensity, to significantly lower your risk of developing several common cancers. You do not need to be an elite athlete; even modest increases in activity levels compared to a sedentary lifestyle provide measurable protective benefits.

Adherence to the Mediterranean Diet (MedDiet) significantly reduces the incidence of major cardiovascular events, including coronary heart disease, stroke, and cardiovascular mortality, in high-risk populations.

Adopt a Mediterranean-style eating pattern as your primary dietary strategy for heart health. Prioritize extra-virgin olive oil as your main cooking fat, fill your plate with minimally processed vegetables, fruits, legumes, and nuts, and include moderate amounts of fish and poultry. Limit red and processed meats, refined grains, and full-fat dairy. If you drink alcohol, moderate red wine with meals is consistent with the traditional pattern, but do not start drinking if you do not already. This pattern has been shown to reduce the risk of heart attack, stroke, and cardiovascular death by approximately 30% in high-risk individuals.

Consuming an additional daily serving of minimally processed plant-based foods (whole grains, fruits, vegetables, nuts, legumes, olive oil) is associated with significantly reduced risk of mortality and chronic diseases (CHD, diabetes, stroke, colorectal cancer) and has among the lowest environmental impacts.

Add one extra serving of whole grains, fruits, vegetables, nuts, legumes, or olive oil to your daily diet. This simple change is linked to lower risks of heart disease, diabetes, stroke, cancer, and early death, while also being better for the environment. Focus on minimally processed options.

Structured exercise programs significantly improve maximum walking distance and pain-free walking distance in patients with intermittent claudication compared to usual care or placebo.

If you have leg pain when walking due to narrowed arteries, do not stop walking. Supervised exercise programs are the standard, high-quality treatment. Aim for sessions 2-3 times a week for at least 30 minutes. You may need to walk until pain starts, rest, then walk again. This improves your walking distance significantly over time.

When resistance training sets are performed to momentary muscular failure, low-load training (≤60% 1RM) produces muscle hypertrophy equivalent to high-load training (>60% 1RM).

If you want to build muscle but only have light dumbbells or bodyweight, you can still get great results. The key is to perform your sets until you physically cannot complete another repetition with good form (momentary muscular failure). You will likely need to do more repetitions (e.g., 20-30+) compared to heavy lifting, but the muscle growth will be the same as if you were lifting heavy weights.

High-load resistance training (>60% 1RM) produces significantly greater gains in maximal strength (1RM) compared to low-load resistance training (≤60% 1RM), even when both are taken to failure.

If your primary goal is to increase your maximum lifting capacity (1RM), you should prioritize heavier weights (above 60% of your max). While light weights will still make you stronger, heavy weights will make you stronger faster and to a greater degree. However, light weights are still a valid tool for building strength, especially for joint health or volume accumulation.

Physical activity interventions significantly improve quality of life, body composition (BMI, body weight), and physical function (peak oxygen consumption, peak power output, 6-minute walk distance) in cancer survivors after completion of primary treatment.

If you have completed your primary cancer treatment, engaging in regular physical activity (aerobic and/or resistance training) is strongly recommended. Aim for a program lasting at least 13 weeks, performed 2-5 times per week at a moderate to vigorous intensity. This will help you improve your body composition, physical strength, and overall quality of life compared to remaining sedentary.

Short-term high-intensity interval training (ST-HIIT, <12 weeks) significantly improves maximal oxygen uptake (VO2 max), diastolic blood pressure, and fasting glucose in overweight/obese populations.

If you are overweight or obese, engaging in short-term high-intensity interval training (less than 12 weeks) can significantly boost your aerobic fitness, lower your diastolic blood pressure, and improve your fasting glucose levels. Focus on intervals performed at high intensity (at least 85% of your max heart rate or oxygen uptake) with short rest periods.

Long-term high-intensity interval training (LT-HIIT, ≥12 weeks) significantly improves waist circumference, body fat percentage, VO2 max, resting heart rate, systolic blood pressure, and diastolic blood pressure in overweight/obese populations.

If you are overweight or obese, committing to long-term high-intensity interval training (12 weeks or more) can significantly reduce your waist circumference and body fat, improve your aerobic fitness, lower your resting heart rate, and reduce both systolic and diastolic blood pressure. Consistency over time is key to seeing these broad cardiometabolic benefits.

Regular consumption of nuts (tree nuts and peanuts) significantly reduces the risk of coronary heart disease (CHD) and sudden cardiac death, with a dose-response relationship observed in prospective studies.

Incorporate a handful (approx. 28g or 1 ounce) of unsalted nuts into your diet several times a week. This habit is strongly linked to a significantly lower risk of heart disease and sudden cardiac death. You do not need to fear weight gain from nuts; they are part of a healthy diet and may even help with weight control.

Regular nut consumption lowers total and LDL cholesterol levels in a dose-dependent manner, particularly in individuals with higher baseline LDL and lower BMI.

If you have high cholesterol, adding about 2-3 ounces of nuts daily to your diet can help lower your LDL levels. This effect is most pronounced if your cholesterol levels are currently high and if you are not overweight.

Regular exercise training induces direct structural and functional vascular adaptations (such as improved flow-mediated dilation and arterial remodeling) via hemodynamic stimuli (shear stress and pressure), which contributes to cardiovascular risk reduction independently of changes in traditional risk factors like blood pressure or lipids.

To improve your cardiovascular health, you must engage in regular physical activity. This is not just about burning calories or lowering numbers on a lab test; the mechanical force of blood flow during exercise physically remodels your arteries to be healthier and more resilient. Consistency is key to maintaining these structural changes.

Being physically active (7.5+ MET-h/wk) and normal weight (BMI 18.5–24.9) is associated with a 7.2-year gain in life expectancy compared to being inactive and obese (BMI 35.0+).

To maximize your life expectancy, aim to be physically active (at least 7.5 MET-h/wk, or 150 minutes of brisk walking per week) and maintain a normal weight (BMI 18.5–24.9). This combination is associated with a 7.2-year gain in life expectancy compared to being inactive and obese. Both factors are critical, and addressing both offers the greatest longevity benefit.

The blood pressure-lowering effects of the DASH diet are greater in individuals with higher baseline blood pressure or higher BMI.

If you have high blood pressure or are overweight, the DASH diet will likely provide you with the most significant blood pressure benefits. Focus on the dietary pattern, as your body is primed to respond to these changes more robustly than those with normal baseline levels.

High conformity with the Mediterranean dietary pattern is associated with a statistically significant reduction in all-cause, cardiovascular, and cancer mortality in a large US population.

Adopt a Mediterranean-style diet by prioritizing vegetables, legumes, fruits, nuts, whole grains, and fish, while limiting red/processed meat and dairy. This pattern is associated with a 20-25% lower risk of death from all causes, including heart disease and cancer, in US adults. You do not need to calculate a score; simply make these food choices your default.

Combining sibutramine pharmacotherapy with intensive group lifestyle modification counseling produces significantly greater weight loss than either intervention administered alone.

If you are using prescription weight-loss medication, do not rely on it alone. You must combine it with intensive lifestyle counseling, specifically focusing on behavioral skills like keeping daily food records. The study shows that combining the drug with 30 weeks of group counseling leads to more than double the weight loss compared to using the drug alone.

Diet and physical activity based interventions during pregnancy significantly reduce gestational weight gain compared to routine care, with a mean difference of -0.70 kg.

Engage in moderate physical activity and follow a balanced diet during pregnancy. This combination significantly reduces excessive weight gain and lowers the risk of caesarean section without harming the baby. These benefits apply to women of all body weights, not just those who are obese.