Browse the evidence

Both obesity (high BMI) and physical inactivity are independently and strongly associated with increased prevalence of type 2 diabetes and cardiovascular comorbidities, meaning fitness does not override the risks of fatness.

You cannot exercise away the risks of obesity, nor can you ignore the risks of inactivity by just being thin. To minimize your risk of diabetes and heart disease, you must address both your body weight and your activity level simultaneously.

High dietary intake of specific carotenoids (alpha-carotene, beta-carotene, lutein/zeaxanthin) and vitamins (A, C) from foods is inversely associated with breast cancer risk in premenopausal women, particularly those with a positive family history or high alcohol consumption.

If you are premenopausal, focus on getting alpha-carotene, beta-carotene, lutein, zeaxanthin, vitamin A, and vitamin C from whole fruits and vegetables rather than supplements. This is especially important if you have a family history of breast cancer or drink alcohol regularly, as the protective association is strongest in these groups. Postmenopausal women without hormone therapy may not see the same benefits from these specific nutrients.

Consumption of tuna or other broiled/baked fish (≥3 times/week) is associated with a significantly lower risk of total and arrhythmic ischemic heart disease (IHD) death in older adults, whereas fried fish or fish sandwich consumption shows no such benefit and trends toward higher risk.

If you are over 65 and want to protect your heart, eat tuna or other baked/broiled fish at least three times a week. Avoid fried fish and fish sandwiches, as they do not offer the same heart protection and might even increase risk. The way you cook the fish is just as important as the fish itself.

In resistance-trained individuals, performing resistance training to volitional failure with loads between 30-90% of 1RM produces similar muscle hypertrophy and strength gains, regardless of whether the load is high or low.

If you are already experienced with resistance training, you do not need to lift extremely heavy weights to build muscle. You can use lighter weights (30-50% of your max) for higher reps (20-25), as long as you push each set to near failure. Both heavy and light loading strategies work equally well for hypertrophy if volume and effort are matched. Focus on consistency and reaching failure rather than obsessing over lifting the heaviest possible weight.

Consuming nuts two or more times per week is associated with a significantly reduced risk of sudden cardiac death compared to rare or no consumption.

Aim to eat a small handful (about 1 ounce) of nuts at least twice a week. This habit is linked to a significantly lower risk of sudden cardiac death in men. You do not need to eliminate other foods to make room for nuts; just ensure your overall calorie intake stays stable. Focus on variety, as walnuts provide specific antiarrhythmic fatty acids.

Bariatric surgery (Roux-en-Y gastric bypass, vertical sleeve gastrectomy, biliopancreatic diversion) induces sustained weight loss and high remission rates for type 2 diabetes compared to non-surgical management.

For adults with severe obesity (BMI ≥35-40) who have not succeeded with lifestyle changes, bariatric surgery is the most effective intervention for sustained weight loss and type 2 diabetes remission. It involves surgical alteration of the stomach and/or intestines. Lifelong daily nutritional supplementation and regular medical monitoring are required to prevent deficiencies.

Bariatric surgery reduces long-term all-cause mortality and the incidence of type 2 diabetes in obese adults.

Bariatric surgery offers a significant long-term survival advantage for severely obese individuals, reducing the risk of death by nearly 30% over 16 years compared to non-surgical care. This benefit extends to a drastic reduction in the development of type 2 diabetes.

Reducing daily step count by approximately 76% for 14 days in healthy elderly adults induces leg lean mass loss and blunts postprandial myofibrillar protein synthesis (anabolic resistance).

For older adults, maintaining habitual daily activity levels is critical even during short periods of illness or recovery. A significant drop in daily steps (e.g., by 75%) for just two weeks can lead to measurable muscle loss and metabolic issues. Do not assume that minor reductions in activity are harmless; consistency in daily movement helps preserve muscle mass and metabolic health.

High intake of refined carbohydrates and high glycemic index foods promotes oxidative stress and chronic inflammation via NF-κB-mediated signaling, contributing to insulin resistance and metabolic syndrome.

Focus on reducing refined carbohydrates and high glycemic index foods (like white rice and added sugars) to lower oxidative stress and inflammation. Opt for lower glycemic index options to help manage blood sugar and metabolic health, especially if you are overweight or have metabolic syndrome.

High intake of processed meats, particularly those cooked at high temperatures, increases the formation of genotoxic and carcinogenic compounds like heterocyclic amines and N-nitroso compounds, contributing to oxidative stress and colorectal cancer risk.

Limit intake of processed meats and avoid cooking red meat at high temperatures (e.g., grilling, charring) to reduce the formation of carcinogenic compounds and oxidative stress. Opt for fresh, unprocessed meats and gentler cooking methods.

Replacing saturated fatty acids (SFA) with monounsaturated fatty acids (MUFA) lowers LDL cholesterol but has an unclear or neutral effect on clinical cardiovascular disease events and mortality compared to SFA.

Swapping saturated fats for monounsaturated fats (like olive oil) will lower your bad (LDL) cholesterol. However, this swap alone may not be enough to prevent heart attacks or strokes. For better protection against heart disease, prioritize replacing saturated fats with polyunsaturated fats (like fish oils, walnuts) or whole grains instead.

Dairy fat has a less adverse impact on cardiovascular disease risk compared to other animal fats (like meat), but it still increases CVD risk relative to unsaturated fatty acids.

Dairy fat (from cheese, butter, milk) is not as bad for your heart as fat from red meat, but it is still worse than unsaturated fats (like olive oil or fish). To protect your heart, limit high-fat dairy and replace it with unsaturated fats or whole grains. You don't need to eliminate dairy, but don't rely on it for heart health.

High responders to 12 weeks of resistance training exhibit differential regulation of specific microRNAs (miR-378, miR-29a, miR-26a, and miR-451) compared to low responders, with miR-378 levels strongly correlating with lean body mass gains.

Resistance training results vary significantly between individuals. This study suggests that 'high responders' maintain stable levels of certain microRNAs (like miR-378) during training, which correlates with greater muscle gain. Low responders show different molecular adaptations (downregulation of miR-378, upregulation of miR-451). If you are not seeing expected muscle gains, it may be due to these underlying molecular differences rather than just effort. Consistency is key, as your body may be using different molecular pathways to adapt.

High intake of trans-fatty acids from partially hydrogenated vegetable oils significantly increases the risk of myocardial infarction, independent of plasma cholesterol levels.

To lower your risk of heart attack, minimize your intake of trans-fatty acids, specifically those from partially hydrogenated vegetable oils. Focus on reducing consumption of stick margarine, which is a major source, and limit processed foods like cookies, crackers, and fried foods that often contain these fats. Opt for tub margarine or other unsaturated fats instead, as the study indicates the risk is driven by vegetable-derived trans-isomers rather than animal-derived ones.

Loss of hip girth (>4.1 cm) is associated with a 1.5 times increased risk of diabetes, independent of weight change, likely due to loss of lean muscle mass.

For men, maintaining hip circumference (likely reflecting muscle mass) is important for diabetes prevention. Losing more than 4.1 cm in hip girth over 9 years increases diabetes risk by 50%, independent of total weight. Focus on preserving muscle mass through resistance training while managing abdominal fat.

During mild-to-moderate intensity exercise (40% VO2max), women oxidize a significantly higher proportion of fat and a lower proportion of carbohydrate compared to men, a difference driven by greater lipolytic sensitivity to catecholamines despite lower absolute catecholamine levels in women.

If you are a woman exercising at a moderate intensity (where you can hold a conversation), your body is likely prioritizing fat burning more efficiently than a man doing the same relative effort. This is due to hormonal differences, specifically how your body responds to stress hormones like epinephrine. This doesn't mean you should avoid carbs, but it does mean your fuel utilization strategy during endurance activities differs from men's.

Consuming nuts two or more times per week is inversely associated with total mortality and mortality from heart disease, cancer, and respiratory disease compared to never consuming nuts.

To support long-term health and reduce mortality risk, aim to eat a serving of nuts (about 1 ounce or 28 grams) at least twice a week. This can include tree nuts (almonds, walnuts, etc.) or peanuts. Consistency matters more than the specific type, as both showed similar benefits. This habit is associated with lower risks of death from heart disease, cancer, and respiratory issues.

Age-related declines in taste and smell acuity reduce dietary variety and palatability, which contributes to reduced energy intake and impaired energy regulation in older adults.

Enhance the flavor, smell, and variety of your meals. Since your senses may be duller, use spices, herbs, and diverse textures to make food appealing, which can help stimulate the cephalic phase of digestion and encourage adequate intake.

SGLT2 inhibitor-induced glycosuria triggers a compensatory increase in energy intake (hyperphagia) that partially offsets the expected weight loss, resulting in net weight loss significantly lower than predicted by urinary glucose excretion alone.

If you take an SGLT2 inhibitor like empagliflozin, your body will naturally try to regain the calories lost in urine by making you eat more. This biological compensation significantly reduces the amount of weight you will lose compared to what the drug's mechanism suggests. To achieve significant weight loss, you cannot rely on the drug alone; you must actively implement caloric restriction to overcome this increased appetite.

Dual GIP/GLP-1 receptor agonism (e.g., tirzepatide) yields superior glycemic control and body weight reduction compared to selective GLP-1 receptor agonists.

For patients with type 2 diabetes seeking maximum glucose and weight reduction, dual GIP/GLP-1 agonists (like tirzepatide) are clinically superior to selective GLP-1 agonists. This represents a shift from previous assumptions that GIP was therapeutically useless in diabetes.

A low-glycemic load diet produces significantly greater weight loss and body fat reduction than a low-fat diet in obese young adults with high insulin secretion (high 30-min post-glucose insulin), whereas both diets yield comparable results in those with low insulin secretion.

If you are obese and struggling with weight loss, your insulin response to carbohydrates might be the key. If you have high insulin levels after eating carbs, switching to a low-glycemic load diet (focusing on nonstarchy vegetables, legumes, and healthy fats) is likely to be more effective for weight loss than a standard low-fat diet. If your insulin response is normal, a low-fat diet will work just as well. Consider getting your insulin response tested to guide your dietary choice.

Higher circulating levels of trans-palmitoleic acid (trans-16:1n-7), an exogenous fatty acid derived primarily from dairy fat, are associated with a significantly lower incidence of type 2 diabetes and improved metabolic risk factors, including lower insulin resistance and triglycerides.

Higher levels of trans-palmitoleic acid, a fatty acid found in dairy products, are linked to a lower risk of developing type 2 diabetes and better metabolic health. While this is an observational finding, it suggests that including whole-fat dairy as part of a balanced diet may be associated with these benefits, distinct from industrial trans fats.

A higher triglyceride-glucose (TyG) index, serving as a surrogate marker for insulin resistance, is significantly associated with increased risks of composite cardiovascular events, cardiovascular mortality, myocardial infarction, stroke, and incident type 2 diabetes.

Your risk for heart disease and diabetes is closely linked to your insulin resistance, which can be estimated using a simple calculation from your fasting triglyceride and glucose levels. This risk is not uniform; it is significantly higher for people living in low- and middle-income countries. Regular monitoring of these markers can help identify those at high risk for cardiovascular events and diabetes, allowing for earlier intervention.

Regular resistance training attenuates the acute increase in muscle protein breakdown (FBR) and synthesis (FSR) following intense pleiometric exercise compared to untrained individuals.

If you are experienced in resistance training, your body becomes more efficient at handling intense workouts. You will see a smaller spike in muscle protein breakdown and synthesis immediately after training compared to when you were a beginner. This does not mean you aren't growing; it means your muscles are adapted to handle the stress with less damage and turnover. Focus on consistency and progressive overload rather than chasing acute soreness or 'maximal' spikes in synthesis.