Browse the evidence

Any type of exercise (aerobic, resistance, combined, or HIIT) improves insulin sensitivity and cardiorespiratory fitness in adults with overweight or obesity.

You don't need to choose just one type of exercise to improve your metabolic health. Whether you walk, lift weights, or do intervals, any of these will improve your insulin sensitivity and heart health. If you try high-intensity intervals, get checked by a doctor first.

Bariatric surgery (Roux-en-Y gastric bypass, sleeve gastrectomy) yields long-term (>3 years) weight reductions of ≥ 20% of initial body weight and decreases morbidity and potentially mortality in patients with severe obesity.

For severe obesity (BMI ≥ 40 or ≥ 35 with health issues), surgery is the most effective option for long-term weight loss (≥ 20% body weight). It reduces health risks and mortality. It is considered when other methods fail.

Weight loss achieved through reduced energy intake and increased energy expenditure reduces the risk and severity of obesity-associated diseases (including type 2 diabetes, cardiovascular disease, and cancer) in a dose-related manner, where greater weight loss yields better health outcomes.

To improve your health, you need to create a calorie deficit (eat less, move more). The more weight you lose, the more your risk for diabetes, heart disease, and other obesity-related conditions decreases. Even a modest loss of 5-10% of your body weight provides significant health benefits, even if it doesn't look like a huge change in the mirror. Focus on the health metrics (blood pressure, blood sugar) as much as the scale.

Exercise training reduces visceral adipose tissue (VAT) independently of total body weight loss, whereas hypocaloric diets reduce total body weight but show minimal change in VAT when weight loss is absent.

If your goal is to reduce dangerous belly fat (visceral adipose tissue), exercise is superior to diet alone when you aren't losing weight on the scale. Dieting reduces overall weight but may not specifically target visceral fat if you don't lose weight. Exercise reduces visceral fat significantly (6.1%) even if your total body weight stays the same, likely because it preserves muscle while burning fat. Stop using the scale as your only measure of success; use waist circumference or imaging if possible.

Maintaining weight loss on a low carbohydrate diet (20% of energy) significantly increases total energy expenditure compared to a high carbohydrate diet (60% of energy), with the effect being most pronounced in individuals with high pre-weight loss insulin secretion.

If you are trying to keep weight off, switching to a lower carbohydrate diet (around 20% of calories from carbs) may give your metabolism a boost, helping you burn more calories than if you ate a higher carbohydrate diet. This benefit is especially strong if you have high insulin levels. The key is maintaining your weight loss while adjusting your macros, not just counting calories.

High-calorie-expenditure exercise (3000-3500 kcal/week) produces significantly greater weight loss and fat mass reduction than standard cardiac rehabilitation exercise (700-800 kcal/week) in overweight coronary heart disease patients.

To lose more weight and improve heart health, focus on burning more calories through exercise rather than just following standard cardiac rehab routines. Aim for 3000-3500 calories of exercise energy per week, which translates to walking 5-7 days a week for 45-60 minutes at a moderate pace. Combine this with a modest calorie-restricted diet and behavioral counseling for best results. This approach is safe for most overweight heart patients and leads to double the weight loss of standard programs.

Consumption of sugar-sweetened beverages contributes to obesity by providing energy that is not fully compensated for by subsequent reductions in food intake, leading to a net positive energy balance.

To reduce obesity risk, prioritize replacing sugar-sweetened beverages (soda, fruit drinks) with water or unsweetened alternatives. The paper indicates that liquid calories are not effectively compensated for by eating less food, leading to a net increase in daily energy intake and weight gain. This is particularly impactful for high-risk groups, and reducing intake can have a measurable impact on population-level obesity.

Sustained weight loss of 5% or more over 1-3 years significantly reduces the incidence of Type 2 Diabetes in adults with Impaired Glucose Tolerance.

Aim to lose just 5% of your body weight within the first year if you have impaired glucose tolerance. The critical factor is not how much you lose, but keeping it off. Maintaining this 5% loss for two to three years cuts your risk of developing Type 2 Diabetes by nearly 90%. Focus on sustainable habits: 30 minutes of moderate activity daily and a diet higher in fiber and lower in fat.

Replacing sugar-sweetened beverages with water or diet beverages reduces weight gain in children and adults.

Replace your sugary drinks with water or diet beverages. This simple swap has been proven in multiple studies to reduce weight gain in both children and adults.

A modest weight loss of 5% to 10% produces significant improvements in glycaemia, blood pressure, and lipid profiles, whereas larger losses (15%+) are required for remission of type 2 diabetes and improvements in obstructive sleep apnea.

Focus on the first 5-10% of body weight loss as a major medical success. This threshold significantly improves blood sugar, blood pressure, and lipids. Do not wait until you reach an 'ideal' weight to see health benefits; the first few kilograms lost provide measurable protection against chronic disease.

A 1-year aerobic exercise intervention of moderate-to-vigorous intensity (approx. 178.5 min/week) significantly reduces total body fat, intra-abdominal fat, and subcutaneous abdominal fat in previously sedentary postmenopausal women without dietary changes.

To lose fat without changing your diet, aim for about 175 minutes of moderate-to-vigorous aerobic exercise per week (e.g., 35 minutes, 5 days a week). Keep your intensity at a level where you can talk but not sing (70-80% of your max heart rate). This approach works for postmenopausal women, even if you are sedentary, and specifically targets dangerous belly fat.

Sustained weight loss and maintenance require a combination of caloric restriction and increased energy expenditure (exercise), as energy balance is the fundamental determinant of weight change.

To lose weight effectively, you must create a calorie deficit through diet and increase your activity. Don't rely on just one. Aim for a moderate reduction in calories (500-1000 less than you burn) and moderate exercise (150-420 minutes of brisk activity per week). This combination preserves muscle and metabolic rate better than dieting alone.

Maintaining a healthy body weight (BMI 18.5-24.9 kg/m2) significantly reduces the incidence of type II diabetes, cardiovascular diseases, and several cancers compared to overweight or obese states.

Your weight matters for your long-term health, even if you aren't clinically obese. Staying within a normal BMI range (18.5-24.9) or at least avoiding the 'overweight' category (25-29.9) significantly lowers your risk of developing diabetes, heart disease, and certain cancers. Focus on maintaining a stable, healthy weight rather than just treating obesity after it occurs.

Dietary patterns (specifically high-fiber/plant-based vs. high-fat/animal-protein) rapidly and reproducibly alter gut microbiota composition and function, shifting enterotypes and metabolic output within days.

Your diet directly shapes your gut bacteria. Shift towards high-fiber, plant-based foods to increase beneficial bacteria (like Prevotella) and decrease bile-tolerant microbes. Conversely, high-fat, animal-protein diets shift the microbiome towards different profiles. You can influence your gut health quickly by changing what you eat.

A structured lifestyle intervention targeting a 7% weight loss and 150 minutes of moderate physical activity per week significantly reduces the incidence of type 2 diabetes in high-risk individuals with impaired glucose tolerance.

To prevent diabetes, aim to lose 7% of your body weight and get 150 minutes of moderate exercise (like brisk walking) each week. Start by tracking fat intake to make it easier, then add calorie tracking if needed. Use a scale and a food/activity log to monitor progress. If you slip up, don't quit; just get back on track. Consistency over perfection is key.

Reducing waist circumference through lifestyle interventions (diet and/or exercise) is a critical and effective strategy for reducing cardiometabolic risk and mortality, independent of total body weight loss.

Aim to reduce your waist circumference through moderate exercise and healthy eating. This specific reduction lowers your risk of heart disease and diabetes, even if the scale doesn't move much.

Higher current Body Mass Index (BMI) is the dominant risk factor for non-insulin-dependent diabetes mellitus (NIDDM) in men, with risk increasing continuously and markedly at BMI levels ≥29.0 kg/m², even after controlling for fat distribution.

Maintaining a BMI below 24.0 kg/m² is the most effective strategy for preventing type 2 diabetes in men. Risk increases continuously with weight, meaning that even modest weight gain or being in the 'normal' weight range (24-29 kg/m²) carries elevated risk compared to leaner weights. Focus on preventing weight gain throughout adulthood rather than just treating obesity after it occurs.

Absolute weight gain throughout adulthood and early adult obesity (BMI at age 21) are significant independent risk factors for diabetes, with risk increasing steadily with the amount of weight gained regardless of starting BMI.

Preventing weight gain after early adulthood is crucial for diabetes prevention. Even if you are not currently obese, gaining significant weight (e.g., >11 kg or 24 lbs) since your 20s significantly increases your risk. Aim to attain a healthy weight (BMI <24) early in life and maintain it.

Obesity is the most important modifiable risk factor for Type 2 Diabetes, influencing insulin resistance and disease progression.

Obesity is the single most important risk factor for developing Type 2 Diabetes, affecting nearly 90% of diabetic patients. Excess body weight directly contributes to insulin resistance. Managing body weight is therefore the most critical modifiable factor in preventing and managing T2DM.

Two-year treatment with orlistat (120 mg three times daily) combined with a controlled-energy diet produces significantly greater sustained weight loss and reduces weight regain compared to placebo plus diet in obese adults.

To sustain weight loss over two years, obese individuals should take 120 mg of orlistat with each of their three main meals while following a controlled-energy diet where 30% of calories come from fat. This combination leads to significantly greater weight loss and less weight regain compared to diet and placebo alone. Be prepared for potential gastrointestinal side effects if fat intake is not strictly managed, as these are expected but usually mild and resolve over time.

Transitioning from insufficient sleep (5 hours) to adequate sleep (9 hours) reduces energy intake, specifically fats and carbohydrates, and leads to slight weight loss, demonstrating that recovery sleep can reverse the positive energy balance caused by sleep restriction.

If you have been sleeping poorly, switching back to 7-9 hours of sleep will help you eat less, particularly fats and carbs, and may help you lose the weight gained during the sleep-deprived period. Consistency is key.

Creatine monohydrate supplementation (5g/day for 5-7 days, followed by 3-5g/day maintenance) significantly increases intramuscular creatine and phosphocreatine stores, leading to enhanced high-intensity exercise performance, greater training adaptations, and increased lean body mass in athletes.

Take 5 grams of creatine monohydrate four times a day for 5-7 days to saturate your muscles, then switch to 3-5 grams daily to maintain levels. This is the most proven supplement for increasing strength and power output. It is safe, legal, and does not cause kidney damage or cramping as commonly feared.

Sedentary, overweight or obese postmenopausal women with elevated blood pressure experience a graded, statistically significant increase in cardiorespiratory fitness (VO2max) when engaging in physical activity doses of 4, 8, or 12 kcal/kg/week, with higher doses yielding proportionally greater fitness gains compared to a non-exercise control.

If you are a sedentary, overweight postmenopausal woman with high blood pressure, you do not need to start with the standard 30-minute daily exercise recommendation to see benefits. You can start with half that dose (expending ~4 kcal/kg/week) and still see significant improvements in your cardiorespiratory fitness. If you can handle more, increasing the dose to 8 or 12 kcal/kg/week will yield even greater fitness gains in a predictable, graded manner.

Weight reduction significantly lowers blood pressure in individuals with high-normal diastolic blood pressure, producing a net reduction of 2.3 mm Hg in diastolic and 2.9 mm Hg in systolic pressure over 18 months.

If you have high-normal blood pressure, losing weight is the most effective non-drug strategy available. This study showed that losing about 4kg (9lbs) over 18 months, achieved through dietary changes and brisk walking, significantly lowered blood pressure. Supplements and stress management techniques did not show significant blood pressure benefits in this specific population, so focus your efforts on sustainable weight loss.