Browse the evidence

Sarcopenic obesity is defined by the co-existence of excess adiposity and low skeletal muscle mass/function, requiring a two-step diagnostic algorithm of screening followed by functional and body composition assessment.

To identify sarcopenic obesity, first screen for high BMI or waist circumference. If positive, test muscle function (e.g., handgrip strength). If function is low, assess body composition (DXA or BIA) to confirm low muscle mass relative to fat. This two-step process ensures accurate diagnosis without unnecessary expensive testing for everyone.

Abdominal or upper-body obesity is independently associated with a higher risk of developing type 2 diabetes, hypertension, and cardiovascular disease compared to lower-body fat distribution.

If you are overweight, where you carry the weight matters for your health risks. Abdominal or upper-body fat is more strongly linked to diabetes and heart disease than lower-body fat. Monitoring waist circumference may provide better insight into your metabolic risk than BMI alone.

Obesity is associated with an increased risk of hypertension, with risk increasing as BMI and abdominal obesity increase.

Managing your weight is important for preventing high blood pressure. The risk of developing hypertension increases as your BMI increases, and those with a BMI of 32 or higher have nearly five times the risk compared to those with a BMI of 23 or lower.

Obesity is associated with an increased risk of coronary heart disease (CHD) mortality, with risk increasing as BMI and waist-to-hip ratio increase.

Maintaining a healthy weight is crucial for preventing heart disease. The risk of dying from coronary heart disease increases significantly as your BMI rises, with those having a BMI of 32 or higher facing nearly six times the risk compared to those with a BMI under 22.

Obesity is associated with an increased risk of gallbladder disease, with risk increasing as BMI and waist-to-hip ratio increase.

Maintaining a healthy weight can help prevent gallbladder disease. The risk of being hospitalized for gallbladder disease increases as your BMI increases, with morbidly obese women facing 2.5 times the risk compared to those with a BMI under 25.

Obesity is associated with an increased risk of cancer mortality, with risk increasing as BMI increases.

Maintaining a healthy weight can help reduce the risk of dying from cancer. The risk of cancer mortality increases as your BMI increases, with women who are at least 40% overweight facing 55% higher risk compared to those of average weight.

Obesity is associated with an increased risk of all-cause mortality, with risk increasing as BMI increases.

Maintaining a healthy weight is crucial for longevity. The risk of dying from any cause increases as your BMI rises, with the lowest mortality found among those with a BMI between 19.0 and 26.9 kg/m2.

Maintaining a BMI between 23.0 and 24.9 is associated with the lowest risk of all-cause mortality in Korean adults, establishing an optimal weight range lower than standard Western classifications.

For Korean adults, aiming for a BMI between 23.0 and 24.9 is associated with the lowest risk of death. This is lower than the standard Western 'normal' range (18.5-24.9). If your BMI is above 25, you may be increasing your risk of cardiovascular disease and cancer. If your BMI is below 18.5, you may be increasing your risk of respiratory diseases. Focus on maintaining this specific range rather than just 'being healthy' by Western standards.

Low BMI (underweight) is associated with increased mortality primarily due to respiratory diseases, while high BMI (overweight/obese) is associated with increased mortality due to cardiovascular disease and cancer.

Your weight matters for different reasons depending on where you are. If you are underweight, you are at higher risk for respiratory diseases like TB and COPD. If you are overweight or obese, you are at higher risk for heart disease and cancer. Aim for a BMI of 23-24.9 to minimize both risks.

High blood pressure, high BMI, high blood glucose, and high serum cholesterol collectively account for 63% of global deaths from cardiovascular disease, chronic kidney disease, and diabetes, with high blood pressure being the single largest individual risk factor.

Your risk of dying from heart disease, kidney disease, or diabetes is largely determined by four measurable numbers: blood pressure, body weight (BMI), blood sugar, and cholesterol. High blood pressure is the single biggest contributor to these deaths globally. You can significantly lower your risk by managing these four metrics through diet, exercise, and medication if prescribed, as they are modifiable.

Five days of insufficient sleep (5 hours/night) increases total daily energy expenditure by approximately 5% but leads to a net positive energy balance and weight gain because ad libitum food intake increases by ~6%, disproportionately driven by post-dinner snacking.

If you consistently sleep only 5 hours a night, you will likely gain weight even if you don't feel hungrier. Your body burns slightly more calories, but you eat significantly more, especially late at night. To prevent this, prioritize getting 7-9 hours of sleep, as it naturally reduces the drive to overeat, particularly carbohydrates and fats.

Inulin-type fructans selectively stimulate the growth of beneficial gut bacteria, particularly Bifidobacteria, acting as prebiotics.

Regularly consume prebiotic fibers like inulin and oligofructose to support beneficial gut bacteria. Don't obsess over high doses; consistency and your existing gut health are key.

Age-related sarcopenia is driven by a combination of motor unit loss, fiber atrophy (specifically Type II), inflammatory cytokine expression, and hormonal declines (IGF-1, testosterone).

Understanding that muscle loss is biological (hormonal/inflammatory) helps explain why it happens, but it does not negate the effectiveness of exercise as a treatment.

In healthy men, estrogen deficiency (caused by aromatase inhibition) is the primary driver of increased body fat, whereas testosterone deficiency is the primary driver of decreased lean mass, muscle size, and strength.

If you are a man experiencing fat gain or loss of muscle/strength, do not assume it is solely due to low testosterone. This study shows that low estrogen (estradiol) is a primary driver of fat gain, while low testosterone drives muscle loss. Treatment strategies should consider both hormones, not just testosterone replacement.

Sexual desire and erectile function decline when both testosterone and estradiol levels are low, indicating that both hormones are required for normal sexual function.

If you are experiencing low libido or erectile dysfunction, check both your testosterone and estradiol levels. Low estrogen can impair sexual function even if testosterone is normal. A balanced hormonal profile is key for sexual health.

Type 2 diabetes mellitus (T2DM) and insulin resistance are significant independent risk factors for the progression of NAFLD to NASH, fibrosis, and cirrhosis, and are associated with increased mortality.

If you have NAFLD and Type 2 Diabetes, managing your blood sugar and insulin resistance is critical to preventing liver damage. T2DM is an independent risk factor for progression to cirrhosis and liver-related mortality.

GLP-1 receptor agonists (GLP-1RAs) effectively treat type 2 diabetes and obesity by mimicking endogenous GLP-1 to stimulate glucose-dependent insulin secretion, suppress glucagon, delay gastric emptying, and reduce appetite via central nervous system signaling.

GLP-1 medications are highly effective for managing type 2 diabetes and obesity. They work by mimicking a natural hormone to boost insulin when needed, lower blood sugar, slow digestion, and reduce hunger. While they often require injections, many are now available as once-weekly shots or even pills. Side effects like nausea are common at first but usually fade. They are not for type 1 diabetes. Always combine with diet and exercise.

Pharmacological therapy with statins, fibrates, niacin, or thiazolidinediones (TZDs) can improve the atherogenic dyslipidemic phenotype in type 2 diabetes, leading to reduced coronary artery disease progression and cardiovascular events.

While diet and exercise are crucial, most people with type 2 diabetes and abnormal lipids will likely need medication to protect their heart. Drugs like statins, fibrates, or TZDs can significantly lower your risk of heart attacks and stroke by correcting specific blood fat abnormalities that lifestyle changes alone might not fully fix. Discuss these options with your doctor.

Obesity and insulin resistance are core drivers of NAFLD, leading to liver accumulation of triglycerides and free fatty acids.

Managing body weight and insulin sensitivity is the most critical step in preventing and treating NAFLD, as these conditions directly cause fat accumulation in the liver.

Weight gain during adulthood (after age 18) is a stronger predictor of diabetes risk than being overweight at age 18, as the risk associated with early-life BMI is eliminated when adjusted for current BMI.

Your weight at age 18 does not permanently sentence you to diabetes. What matters most is your current weight and how much weight you have gained since young adulthood. If you were heavier in your youth but have since reached an average or healthy weight, your risk is significantly lower than if you had remained heavy. Focus on preventing weight gain in adulthood.

Central (visceral) obesity is a primary driver of metabolic syndrome, hypertension, and insulin resistance through mechanisms involving increased lipolysis, pro-inflammatory cytokine release, and free fatty acid flux to the liver.

Focus on reducing abdominal fat, as it is more dangerous than fat stored elsewhere. This involves managing overall energy balance and addressing insulin resistance through lifestyle changes, as visceral fat drives metabolic syndrome.

Women with polycystic ovary syndrome (PCOS) exhibit intrinsic insulin resistance independent of body mass index (BMI), with a prevalence of 75% in lean women and 95% in overweight women, as measured by the gold-standard euglycaemic-hyperinsulinaemic clamp.

If you have PCOS, do not assume your metabolic health is determined solely by your weight. Even if you are lean, you may have 'intrinsic' insulin resistance that lifestyle changes alone cannot fully correct. This biological reality requires targeted medical screening (like glucose tolerance tests) and potentially pharmacological interventions (like metformin) alongside lifestyle changes, regardless of your BMI.

High sedentary time is a convincing risk factor for increased Type 2 Diabetes Mellitus (T2DM) incidence.

Reducing your sedentary time is a highly effective strategy to reduce your risk of Type 2 Diabetes. The evidence is very strong: people who spend more time being sedentary have a significantly higher risk of developing the disease. Try to incorporate more movement into your daily routine, even if you already exercise.

Genetically predicted lower alcohol consumption is associated with lower systolic blood pressure, lower inflammatory markers (IL-6, CRP), and lower non-HDL cholesterol, but does not significantly affect HDL cholesterol levels in a manner that explains cardiovascular protection.

Alcohol consumption negatively impacts blood pressure and inflammation, key drivers of heart disease. While alcohol may raise HDL cholesterol, this effect is inconsistent and likely not the primary reason for any perceived benefits. Reducing alcohol intake improves blood pressure and inflammatory markers, contributing to better heart health.