Browse the evidence

Aerobic training is superior to strength training for reducing total body fat mass and body fat percentage in overweight/obese young adults.

If your primary goal is to lose body fat (not just weight), prioritize aerobic exercise (walking, cycling, running) over strength training. While both help, aerobic exercise resulted in significantly greater fat loss in this study.

In free-living adults consuming ad libitum diets, reducing intake of free sugars or sugar-sweetened beverages causes a statistically significant decrease in body weight, while increasing intake causes a comparable increase.

If you are eating freely without strict calorie counting, reducing your intake of free sugars (added sugars, honey, syrups, fruit juices) will likely lead to modest weight loss (approx. 0.8 kg), while increasing it will lead to weight gain. This happens because sugar does not make you feel full enough to compensate for the calories, leading to higher total energy intake. Replacing sugary drinks with water or unsweetened alternatives is the most effective lever.

Intensive lifestyle intervention targeting 7-10% weight loss through diet, exercise, and behavioral modification significantly improves liver histology (NAS) and steatosis in patients with biopsy-proven NASH.

To improve liver health in NASH, aim for a 7-10% weight loss over 6-12 months using a structured lifestyle program. This involves eating 1000-1500 calories daily with 25% fat, and walking 200 minutes per week. Use tools like pedometers and portion-controlled foods to help adhere to these goals.

Increasing dietary fiber intake by 14 g/day for more than 2 days under ad libitum conditions reduces energy intake by 10% and results in an average body weight loss of 1.9 kg over approximately 3.8 months.

To lose weight without strict calorie counting, simply add 14 grams of fiber to your daily diet for at least two days. This natural increase in fiber reduces your overall calorie intake by about 10% and leads to modest weight loss (approx. 2 kg) over a few months. You can achieve this by swapping refined grains for whole grains and increasing fruit and vegetable consumption.

Exercise interventions result in small but significant weight loss in adults with overweight or obesity, with greater reductions achieved when exercise is combined with dietary changes or when exercise intensity is increased.

To lose weight, you must exercise consistently (3-5 days/week for 15-60 minutes). However, exercise alone yields small results. For meaningful weight loss, combine exercise with dietary changes. Increasing the intensity of your exercise will further increase the amount of weight you lose.

A combined energy deficit of 500–1000 kcal/day and exercise of 150–300 minutes/week is the recommended standard for effective weight loss and prevention of weight regain in adults.

To lose weight and keep it off, aim to eat 500-1000 calories less than you burn each day. Start with 150 minutes of moderate exercise (like brisk walking) per week. If you want to prevent weight regain, gradually increase your exercise time to 200-300 minutes per week. Focus on reducing dietary fat to under 30% of your total calories. This combination is the most effective strategy for long-term success.

A maintained weight reduction of approximately 9% or more after one year is sufficient to significantly decrease the 2-year incidence of diabetes, hyperinsulinemia, hypertriglyceridemia, and hypo-HDL-cholesterolemia, while a 30% reduction is required for hypertension.

You do not need to lose a massive amount of weight to see metabolic benefits. Losing just 9% of your body weight can significantly lower your risk of diabetes and lipid issues. However, preventing high blood pressure may require a larger loss (around 30%).

Regular moderate-intensity exercise (approx. 200 min/week) significantly reduces total body fat and intra-abdominal fat in sedentary, overweight postmenopausal women without caloric restriction.

To lose body fat, aim for about 3.5 days of moderate exercise per week, totaling around 200 minutes. You do not need to change your diet to see results, though maintaining your usual intake is key. Start with shorter, easier sessions and gradually increase the duration and intensity over the first two months to build consistency.

Combining diet with exercise yields significantly greater long-term weight loss (approx. 1.14 kg) compared to diet alone in overweight or obese adults.

If you are trying to lose weight long-term, adding exercise to your diet will help you lose more weight than dieting alone. While the average extra loss is about 1.1 kg (2.5 lbs), this benefit persists even after 2 years. You do not need a specific type of exercise or diet; the combination itself is the key factor for superior outcomes compared to diet restriction alone.

Intermittent energy and carbohydrate restriction (IECR) performed on 2 days per week yields significantly greater reductions in insulin resistance (HOMA) and body fat compared to daily energy restriction (DER) in overweight women over a 3-month period.

To improve insulin sensitivity and lose more body fat than standard daily dieting, try restricting calories and carbs to very low levels (under 40g carbs, ~600 kcal) for just 2 consecutive days a week. On the other 5 days, eat enough to maintain your weight using a balanced, Mediterranean-style diet. This approach was shown to be more effective for metabolic health and fat loss than restricting calories every single day for 3 months.

Moderate caloric restriction (1200-1500 kcal/d) combined with behavior modification produces an average short-term weight loss of 8.5 kg over 20 weeks, though patients typically regain one-third of this loss within one year.

To lose weight using moderate restriction, aim for 1200-1500 calories daily with a focus on behavior change (tracking food/activity). Expect to lose about 8.5 kg in 5 months. To keep it off, you must treat obesity as a chronic condition and engage in ongoing maintenance, such as regular check-ins or exercise, rather than stopping after the initial loss.

Sustaining a weight loss of 10% or more of initial body weight over 24 months requires maintaining leisure-time physical activity (LTPA) of approximately 275 minutes per week (or ~1800 kcal/week), which is roughly double the standard public health recommendation of 150 minutes per week.

If your goal is to keep off more than 10% of your body weight long-term, standard exercise guidelines (150 minutes/week) are likely insufficient. You need to aim for roughly 275 minutes of moderate-to-vigorous activity per week (about 55 minutes, 5 days a week). This is double the standard recommendation. Combine this with a caloric deficit and behavioral support (like regular check-ins) to maximize your chances of success.

A whole food plant-based (WFPB) diet, specifically low in fat (7-15% energy) and ad libitum (no calorie restriction), produces significant weight loss and BMI reduction in adults with obesity, type 2 diabetes, or cardiovascular risk factors, superior to standard care alone.

Adopt a whole food, plant-based diet that is low in fat (minimize oils, nuts, avocados) and high in starches (potatoes, bread, pasta, rice) and vegetables. Do not count calories; eat until you are full. Take a 50 mcg daily Vitamin B12 supplement. This approach has been shown to produce significant weight loss and improve metabolic markers in people with obesity and related conditions, without needing to restrict total energy intake or exercise.

Combining calorie-restricted diets with regular physical exercise produces superior and more sustainable weight loss compared to diet or exercise alone.

To lose weight and keep it off, you must combine a reduced-calorie diet with regular exercise. Aim for a 500-1000 kcal daily deficit and 200-300 minutes of moderate exercise per week. Don't rely on exercise alone for initial loss; use it to help you stick to your diet and maintain your weight long-term. Choose a diet style you enjoy to ensure compliance.

Aerobic exercise performed at moderate to high intensity reduces visceral adipose tissue (VAT) in overweight and obese adults, even without caloric restriction.

To reduce dangerous belly fat (visceral adipose tissue), focus on aerobic exercises like brisk walking, jogging, or cycling at a moderate to high intensity (where you can talk but not sing, or higher). Do this at least twice a week for at least 8 weeks. You do not need to restrict calories to see these specific fat loss benefits, though diet is still important for overall health. Men tend to see slightly larger reductions in visceral fat area than women with this approach.

Sustained moderate-intensity aerobic exercise combined with constant energy intake induces significant fat mass loss while completely preserving fat-free mass.

To lose fat without losing muscle, you must exercise moderately (around 50-55% of your max effort) for about 93 days, burning roughly 1,000 kcal daily through exercise, while eating exactly enough to maintain your current weight. Do not restrict calories; let the exercise create the deficit. This preserves your lean mass while stripping fat.

Diet-induced weight loss significantly improves coronary artery disease (CAD) risk factors (glucose, insulin, lipids, blood pressure) in obese, middle-aged and older men, whereas aerobic exercise training without weight loss has substantially less beneficial effects on these parameters.

If you are obese and middle-aged or older, losing weight through diet is significantly more effective for improving your blood sugar, cholesterol, and blood pressure than exercising alone. While exercise is great for heart fitness, it does not fix metabolic issues as well as shedding fat mass. Focus on creating a caloric deficit to reduce body weight by at least 10%.

Commercial weight loss programs (Atkins, Weight Watchers, Slim-Fast, Rosemary Conley) produce clinically significant weight and fat loss over six months, with no statistically significant difference in final efficacy between the four diets.

Choose a commercial weight loss program that you can realistically adhere to for at least six months. Expect to lose approximately 5-8 kg (11-18 lbs) and 4-5 kg of fat if you stick with it. Do not expect one specific brand (like Atkins or Weight Watchers) to be inherently superior to others in the long run; success depends on your ability to follow the specific rules of the chosen program consistently.

Consuming a diet rich in medium-chain triglycerides (MCTs) for 28 days significantly reduces upper body adipose tissue in overweight men compared to long-chain triglycerides (LCTs).

If you are overweight, replacing some of your long-chain fats (like olive oil or butter) with medium-chain triglycerides (MCTs) may help you lose a bit more upper body fat over a month, provided you keep your overall calories stable. Don't expect miracles; the metabolic boost is real but small. Focus on the quality of your fats, not just the quantity.

High consumption of ultra-processed foods (UPF), defined as >30.8% of total daily energy intake, significantly increases the risk of large weight gain (≥1.68 kg/year) and large waist circumference gain (≥2.42 cm/year) compared to low consumption (<17.8% of energy).

To minimize weight and waist gain, limit ultra-processed foods to less than 17.8% of your daily energy intake. Focus on minimally processed foods, as UPFs are designed to be overconsumed due to low satiety and high energy density, regardless of sugar content.

High consumption of ultra-processed foods increases the risk of incident overweight and obesity (BMI ≥ 25 kg/m²) in individuals who are not overweight at baseline, with a 20% greater risk observed in the highest consumption quartile.

If you are currently normal weight, limiting UPF intake is crucial to prevent future weight gain. High UPF consumption increases your risk of becoming overweight by 20% compared to low consumption.

Consuming low-energy density (low-ED) foods promotes satiety, reduces hunger, and decreases energy intake in the short term, leading to moderate weight loss in long-term studies.

To lose weight, prioritize foods with low energy density, such as those high in fiber and water (vegetables, fruits, legumes) and low in fat. This approach promotes satiety and reduces overall energy intake. While low-fat diets help, combining them with high fiber yields significantly better weight loss results.

Adhering to 60 minutes per day of moderate-to-vigorous aerobic exercise for 12 months significantly reduces body weight, BMI, and total body fat mass in both men and women, even without dietary changes.

To lose weight and body fat without changing your diet, commit to 60 minutes of moderate-to-vigorous aerobic exercise (like brisk walking, cycling, or swimming) 6 days a week. Start slowly over the first 3 months to build up to this duration. This protocol has been proven to reduce weight and fat mass in adults aged 40-75.

Greater increases in physical activity adherence (measured by steps per day, exercise minutes, or VO2max) are associated with greater decreases in weight, BMI, body fat, and intra-abdominal fat.

To maximize fat loss, focus on increasing your daily physical activity over time. Whether through more steps, more minutes of exercise, or improved fitness (VO2max), greater adherence leads to greater fat loss. Start where you are and gradually increase your activity levels.