Browse the evidence

Consuming sugar-sweetened beverages (SSBs) is causally associated with greater long-term weight gain and increased risk of obesity, whereas substituting SSBs with water, coffee, or diet beverages mitigates this gain.

To prevent weight gain, reduce your intake of sugar-sweetened beverages and fruit juices. Try replacing one serving of these drinks daily with water, black coffee, or diet beverages. This simple swap is associated with significantly less weight gain over time.

Excess body weight and weight gain are strongly associated with increased risk of type 2 diabetes, cardiovascular disease, certain cancers, and premature mortality, even within the 'normal' BMI range.

Maintain a stable weight and avoid excess adiposity to reduce your risk of diabetes, heart disease, cancer, and premature death. This is true even if you are currently in the 'normal' BMI range, as weight gain itself is a significant risk factor.

Adiposity (high BMI) is a robust, convincing risk factor for increased Type 2 Diabetes Mellitus (T2DM) incidence, supported by meta-analyses of observational studies and Mendelian randomization.

Maintaining a healthy body weight is one of the most powerful ways to prevent Type 2 Diabetes. The evidence is extremely strong: higher BMI directly correlates with a significantly higher risk of developing the disease. Focus on sustainable lifestyle changes that support a healthy weight, as this is a primary lever for T2DM prevention.

The dose-response relationship between physical activity and health outcomes exhibits diminishing returns, where the greatest risk reduction occurs when moving from inactivity to moderate activity, rather than from moderate to high activity.

Don't be discouraged if you don't see massive additional benefits by doubling your exercise time. The most critical health improvements happen when you go from doing nothing to doing something. Once you reach the recommended 150 minutes, you are already getting the vast majority of the protective benefit against heart disease and diabetes.

Sedentary behavior is a major independent risk factor for chronic disease morbidity and mortality in older adults, and the decline in overall physical activity with age has significant public health implications.

Avoid prolonged sitting. Even without formal exercise, simply increasing daily movement (standing, walking, chores) reduces the high risk of chronic disease and death associated with a sedentary lifestyle.

Weight loss achieved through an intensive lifestyle intervention significantly reduces the severity of obstructive sleep apnea (OSA) in obese patients with type 2 diabetes, with greater weight loss correlating to greater AHI reduction.

If you have type 2 diabetes and sleep apnea, losing weight is one of the most effective ways to reduce the severity of your sleep apnea. Aim for at least 10 kg (22 lbs) of weight loss through a calorie-controlled diet and regular moderate exercise (like brisk walking). This can significantly reduce the number of breathing interruptions during sleep and may even lead to the remission of sleep apnea.

Moderate weight loss markedly reduces the development of type 2 diabetes in individuals with impaired glucose tolerance, independent of glycemic index/load.

If you are at risk for type 2 diabetes (impaired glucose tolerance), focus on achieving moderate weight loss. This is the single most effective step you can take to prevent the disease, more so than focusing solely on glycemic index or load.

Ingesting carbohydrates during endurance exercise (30-60g/hour) sustains blood glucose and improves performance, while adding protein (CHO:PRO ratio 3-4:1) further enhances endurance performance and glycogen re-synthesis.

For any endurance activity lasting over an hour, drink a 6-8% carbohydrate solution (8-16 oz) every 10-15 minutes. If you want to maximize performance and recovery, add protein to create a 3:1 or 4:1 carb-to-protein ratio. This keeps your blood sugar stable and helps you go longer.

Aerobic training (AT) is superior to resistance training (RT) for reducing total body mass and fat mass in overweight or obese adults when exercise time is matched.

If your goal is to lose fat and body weight, prioritize aerobic exercise (like running, cycling, or elliptical) over resistance training. While lifting weights is great for building muscle, it does not reduce fat mass as effectively as aerobic exercise when you spend the same amount of time exercising. To maximize fat loss, focus on aerobic activities at 65-80% of your max heart rate.

Sleep restriction (4 hours time in bed) in healthy adults causes significant weight gain and increased caloric intake, driven primarily by a shift in meal timing toward late-night consumption (22:00-03:59) and increased meal frequency.

If you are restricting your sleep to around 4 hours a night, you are likely to gain weight and eat more calories, especially late at night. To mitigate this, try to maintain a consistent sleep schedule and be mindful of your eating habits, particularly in the late evening. If you must stay up late, be aware that you are more likely to consume extra calories and gain weight.

Intensive lifestyle interventions, including medical nutrition therapy and physical activity, can prevent or delay the onset of type 2 diabetes in high-risk individuals (impaired glucose tolerance, overweight) by reducing the risk by up to 58-71%.

If you are overweight and have impaired glucose tolerance, you can significantly lower your risk of developing type 2 diabetes through lifestyle changes. Focus on losing weight, eating less saturated fat, eating more fiber, and getting 30 minutes of moderate exercise most days. This approach is more effective than medication alone for prevention, especially for older adults.

Engaging in 11.25 MET hours per week of leisure-time physical activity (equivalent to 150 minutes/week of moderate activity) reduces the risk of incident type 2 diabetes by 26% compared to being completely inactive.

Aim for 150 minutes of moderate activity per week (like brisk walking) to cut your diabetes risk by roughly a quarter compared to being inactive. You don't need to do extreme amounts of exercise to get the main benefit, but doing more than 150 minutes will give you even greater protection.

Doubling the recommended physical activity dose (22.5 MET h/week) reduces type 2 diabetes risk by 36%, and high doses (60 MET h/week) reduce it by 53%, showing no plateau in benefits.

If you can, aim for more than the standard 150 minutes per week. Doing double that amount cuts your diabetes risk by 36%, and very high activity levels can cut it by over half. There is no 'maximum' benefit where extra exercise stops helping.

Obesity is a primary driver of type 2 diabetes risk in minority populations, and population-level interventions targeting weight loss can favorably impact endocrine health disparities.

For minority populations at high risk for diabetes, focusing on weight management is a critical strategy to reduce disease burden. This is not just about individual willpower but involves addressing systemic factors that contribute to obesity in these groups.

Maintaining a body mass index (BMI) in the lower normal range (21-23 kg/m2) and engaging in regular physical activity significantly decreases the risk of developing type 2 diabetes.

To prevent type 2 diabetes, prioritize keeping your BMI between 21 and 23 and stay physically active. While specific diets (low fat, low carb, high fiber) have some benefits, the strongest evidence supports weight management and exercise. Aim for regular, vigorous activity if possible, and avoid abdominal obesity. This is the most reliable way to lower your risk.

Pre-pregnancy overweight or obesity and excessive gestational weight gain are significant, modifiable risk factors that increase the incidence of GDM.

Maintain a healthy weight before pregnancy. If overweight, aim for gradual weight loss before conceiving. During pregnancy, monitor weight gain closely to ensure it stays within recommended guidelines for your pre-pregnancy BMI.

In individuals with type 2 diabetes, hepatic fat content and hepatic insulin resistance are normalized within days of initiating a hypoenergetic diet, whereas muscle insulin sensitivity remains abnormal for weeks.

If you have early type 2 diabetes, focus on reducing liver fat through a caloric deficit. You do not need to wait for muscle insulin sensitivity to improve; fixing the liver and lowering fasting glucose happens very quickly (within days) by eating less.

Substituting low-energy sweeteners (LES) for sugar in beverages and foods reduces total energy intake and body weight in both adults and children compared to sugar-sweetened alternatives.

If you want to reduce your calorie intake and body weight, replacing sugar-sweetened beverages and foods with low-energy sweetened alternatives is an effective strategy. This substitution leads to a measurable reduction in energy intake and body weight compared to consuming sugar, without increasing appetite or causing compensatory overeating.

Long-term exercise produces a dose-dependent reduction in body weight and fat mass, refuting the media narrative that exercise nullifies energy expenditure through compensatory hunger.

Consistent, long-term exercise leads to weight loss proportional to the energy expended, regardless of whether you measure it in minutes or calories. Do not avoid exercise due to fears of compensatory hunger; the net result is fat loss.

Creatine supplementation improves performance in strength and power events by increasing muscle creatine and creatine phosphate, but not all athletes benefit equally.

If you do strength or power sports, creatine is one of the few supplements with strong evidence for improving performance. Take 20g per day for 4-6 days, then 2-5g daily. It is safe and legal. Vegetarians may see greater benefits. Combine with carbs to enhance uptake.

A very low energy diet (2.3 MJ/day) for 7 weeks followed by gradual reintroduction significantly reduces the severity of moderate to severe obstructive sleep apnoea (AHI) in obese men, with the greatest clinical benefit observed in patients with severe baseline disease.

For obese men with moderate to severe sleep apnoea, a strict liquid very low energy diet (approx 550 kcal/day) for 7 weeks, followed by a 2-week transition to normal eating, can significantly reduce sleep apnoea severity. This approach is particularly effective for those with severe symptoms, potentially allowing them to reduce or stop CPAP use. The key is rapid, significant weight loss, which reduces neck circumference and airway obstruction.

Low energy availability, rather than the physical or psychological stress of exercise itself, causes exercise-induced amenorrhea, and this dysfunction can be reversed by increasing caloric intake while maintaining the exercise regimen.

If you are experiencing menstrual irregularities or amenorrhea due to strenuous exercise, the primary driver is likely low energy availability (not eating enough for your activity level). The solution is to increase your caloric intake significantly (often requiring 400+ extra calories daily) while maintaining your current exercise routine. This should restore hormonal balance and menstruation within weeks, confirming that energy deficit, not exercise stress, was the cause.

Combining moderate-intensity aerobic exercise with calorie restriction produces significantly greater initial weight loss and fat mass reduction than calorie restriction alone.

To maximize weight loss, do not rely on diet alone. Combine a moderate calorie deficit (1,200-2,100 kcal/day) with at least 150 minutes of moderate aerobic exercise per week (spread over 5 days). This combination yields significantly more weight and fat loss than dieting by itself.

Modest weight loss (5%-10% of initial weight) is associated with improvements in cardiovascular risk factors such as hypertension and dyslipidemia.

You don't need to lose a huge amount of weight to improve your health. Losing just 5-10% of your body weight can improve blood pressure, cholesterol, and diabetes risk. Focus on this modest goal.