Browse the evidence

In individuals with type 2 diabetes, combining caloric restriction with high-dose exercise (300-330 minutes/week) significantly reduces fat mass percentage more than caloric restriction alone, while preserving fat-free mass.

For people with type 2 diabetes, dieting alone causes muscle loss along with fat. To maximize fat loss and keep muscle, you must add exercise. Aim for 6 sessions a week (300-330 mins total) mixing cardio and weights. If that is too much, start with 3 sessions (150-165 mins), which still burns more fat than dieting alone without losing muscle.

High-dose exercise (300-330 min/week) preserves fat-free mass during caloric restriction in type 2 diabetes, whereas moderate exercise (150-165 min/week) and diet-only interventions result in fat-free mass loss.

If you have type 2 diabetes and are dieting, you risk losing muscle. To stop this, you need high-volume exercise (at least 5 hours a week) including weights. Standard '150 minutes of exercise' guidelines are not enough to protect your muscle mass during weight loss.

Combined exercise and dietary interventions produce significantly greater body weight loss than exercise alone in adults with overweight or obesity, but do not significantly reduce ectopic fat (liver fat, visceral fat area, or intramuscular triglycerides) compared to exercise alone.

If your goal is simply to lose body weight, adding exercise to your diet will help you lose more weight than dieting alone. However, if your specific goal is to reduce ectopic fat (fat in your liver, visceral area, or muscles), simply combining diet and exercise may not be more effective than exercise alone. You may need to focus on specific types of exercise or longer durations (>12 weeks) to target these specific fat depots, as general weight loss does not guarantee ectopic fat reduction.

Long-term interventions (>12 weeks) involving either exercise or caloric restriction are successful in decreasing visceral fat area (VFA) in adults with overweight or obesity, whereas short-term interventions may not be.

To reduce visceral fat, you need to stick with your exercise or diet plan for more than 12 weeks. Short-term efforts may not be enough to target this specific type of fat. Consistency over time is key.

High-protein isocaloric diets (HPD) preserve or increase muscle mass during weight loss, whereas very low-energy diets (VLED) significantly decrease muscle mass.

If you are losing weight, ensure your protein intake is high (around 1.8g per kg of body weight). This helps you keep your muscle while losing fat. Very low-calorie diets without high protein will cause you to lose muscle mass.

Ketogenic diets (KD) significantly reduce waist circumference compared to other dietary interventions, indicating superior reduction in central adiposity.

If you want to specifically target belly fat (waist circumference), a ketogenic diet (very low carb, high fat) is effective. It significantly reduces waist size compared to other diets, even when calories are not restricted.

Isocaloric diets with macronutrient distribution (LCD, KD, HPD) result in greater weight loss than caloric restriction diets (LED, VLED) in obese women over 12 weeks.

You can lose weight without counting calories if you focus on macronutrients. Diets that adjust carbs, protein, or fat ratios (like Keto, Low-Carb, or High-Protein) can lead to greater weight loss than simple calorie restriction over 12 weeks.

A hypocaloric diet leads to statistically significant weight loss in adults with overweight or obesity regardless of whether the macronutrient composition is high-protein or high-carbohydrate.

To lose weight, you must create a caloric deficit. This study shows that whether you get those calories from protein or carbohydrates matters less than the total calorie reduction. A daily reduction of 500 kcal led to significant weight loss regardless of the macronutrient split. Choose the diet composition you can sustain best while maintaining this deficit.

Providing personalized biofeedback on resting energy expenditure (REE) and respiratory quotient (RQ) via portable indirect calorimetry significantly enhances weight loss outcomes compared to standard care alone in individuals with obesity.

If you have obesity, asking for a metabolic test (indirect calorimetry) during your weight loss program can help you lose more weight than standard advice alone. This test measures how you burn fat vs. carbs and your resting energy needs. Share these results with your dietitian so they can tailor your calorie and exercise goals to your specific biology, rather than using generic formulas. This personalized approach led to significantly greater weight loss and waist circumference reduction in this study.

A 12-month 4:3 intermittent fasting protocol significantly reduces binge eating and uncontrolled eating behaviors compared to daily caloric restriction, and these behavioral improvements are associated with greater weight loss.

If you struggle with binge eating or losing control over food intake, try a 4:3 intermittent fasting schedule (fasting for 3 non-consecutive days a week with significant calorie restriction, and eating normally for the other 4 days) combined with behavioral support. This approach may help reduce binge eating tendencies more effectively than strict daily calorie counting, potentially leading to better long-term weight loss.

A modest reduced-calorie diet (75% of energy requirements) for two months significantly improves lipid profiles, blood pressure, and specific inflammatory markers (ICAM-1, MCP-1) in overweight/obese adults with cardiovascular risk factors.

If you are overweight or obese and have high blood pressure, cholesterol, or blood sugar, cutting your daily calories to 75% of what your body normally burns (a 25% reduction) for two months can significantly lower your bad cholesterol, triglycerides, and blood pressure. It also reduces specific markers of blood vessel inflammation. You do not need to change your exercise routine, but you should avoid omega-3 supplements during this period. Focus on filling your reduced calories with vegetables, fruits, and lean proteins to stay full.

A daily caloric deficit of 500-1,000 kcal (low-calorie diet) produces a weight loss of 0.5-1.0 kg per week and up to 10% body weight over 6 months.

To lose weight steadily, reduce your daily calorie intake by 500 to 1,000 calories compared to what you normally eat. This moderate deficit typically results in losing 0.5 to 1.0 kg per week. Over six months, this approach can help you lose about 10% of your body weight. Focus on sustainable habits rather than extreme restriction.

Very Low-Calorie Ketogenic Diet (VLCKD) produces superior weight loss compared to low-carbohydrate diets and is recommended for severe obesity and specific metabolic conditions.

VLCKD is a very strict, low-calorie (<800 kcal) ketogenic diet that produces superior weight loss compared to standard low-carb diets. It is recommended for severe obesity and specific metabolic conditions under medical supervision. It is not suitable for everyone and has strict contraindications.

In well-trained males, full-body resistance training routines produce significantly greater fat mass loss than split-body routines when weekly training volume is matched.

If you are an experienced male lifter trying to lose fat, switch to a full-body routine (training all major muscle groups 5 days a week) instead of splitting body parts across the week. Keep your total weekly sets the same (around 75 sets). This approach will likely help you lose more fat because you will feel less sore and move more during the rest of your day, burning more calories overall.

Progressive weight loss exceeding 30% induces 100% remission of hyperinsulinemia (HI) and insulin resistance (IR) in individuals with overweight or obesity, whereas lower weight loss thresholds yield partial or no remission.

If you have high insulin or insulin resistance, losing a small amount of weight (5-10%) will help your health, but it likely won't cure the metabolic issue. To fully reverse hyperinsulinemia and insulin resistance, you generally need to lose more than 30% of your body weight through a sustained, intensive lifestyle and medical program over a year.

Time-restricted eating (TRE) significantly reduces body weight and fasting insulin levels in overweight and obese women compared to control groups, without negatively affecting fat-free or lean body mass.

If you are overweight or obese, try restricting your eating window to 8-10 hours a day (e.g., 10 AM to 6 PM). This approach has been shown to help women lose weight and improve insulin sensitivity without losing muscle mass, and it is often easier to stick to than strict calorie counting.

The superiority of low-carbohydrate diets for weight loss and body fat percentage reduction is most pronounced in subgroups with longer follow-up (≥6 months), younger age (<60 years), and very low carbohydrate intake (<10% carbs).

To maximize weight loss benefits from a low-carb diet, aim for very low carbohydrate intake (<10% of calories) and maintain the diet for at least 6 months. This approach is particularly effective for individuals under 60 years of age.

Lifestyle modifications (diet and physical activity) produce 5-10% weight loss and improve metabolic health, serving as the recommended first-line therapy for obesity.

Adopt a sustainable diet that creates a caloric deficit and engage in regular physical activity, including both aerobic exercise and strength training. This approach reliably yields 5-10% body weight loss and improves metabolic health markers like blood pressure and HbA1c. Consistency and realistic goal-setting are key to long-term success.

Intermittent Caloric Restriction (ICR), specifically Alternate Day Fasting (ADF), is as effective as Continuous Caloric Restriction (CCR) for weight loss but offers superior compliance and lean mass retention.

Try Alternate Day Fasting: Eat normally on one day, then restrict calories significantly (or fast) the next. This method is just as effective for weight loss as daily calorie counting but may be easier to stick to because you aren't restricted every day.

Caloric Restriction (CR) is more effective for weight loss than low-fat diets without caloric restriction, and low-carbohydrate diets are more effective than low-fat diets regardless of caloric restriction.

If you are restricting calories, choose a low-carbohydrate or Mediterranean diet rather than a low-fat diet for better weight loss results.

Alternate-day fasting (ADF) and time-restricted feeding (TRF) provide superior reductions in fasting glucose and LDL-cholesterol compared to continuous energy restriction (CER) and ad libitum diets, while offering similar weight loss benefits to CER.

If you are using intermittent fasting for heart health or blood sugar, choose your strategy carefully. Alternate-day fasting appears best for lowering bad cholesterol (LDL), while time-restricted feeding (eating within a specific window each day) is superior for lowering fasting blood glucose. Both methods lose weight similarly to standard calorie restriction, but offer these specific metabolic advantages.

Lactobacillus sp. probiotic supplementation significantly reduces body mass index, body weight, waist and hip circumference, and visceral/subcutaneous fat mass in non-comorbid obese individuals compared to placebo.

If you are obese without other major health conditions, adding a Lactobacillus probiotic (doses ranging from 1 million to 50 billion CFU daily) to your routine may help reduce body weight, BMI, and waist circumference. The effect is modest but statistically significant, particularly when taken for at least 12 weeks. It is not a magic bullet but may support other lifestyle changes.

Resistance training combined with high protein intake (1.6-2.0 g/kg/day) preserves or increases muscle mass during caloric restriction, whereas high protein intake alone is insufficient without resistance training.

To lose fat without losing muscle, you must lift weights (at least 10 sets per muscle group per week) and eat 1.6-2.0 grams of protein per kilogram of body weight daily. Do not rely on protein shakes or dieting alone.

In adults with obesity without diabetes, tirzepatide produces significantly greater weight loss and cardiometabolic improvements than semaglutide over 6 months, even when semaglutide patients receive higher maintenance doses.

If you are choosing between tirzepatide and semaglutide for obesity management without diabetes, tirzepatide offers greater weight loss and better cardiometabolic improvements over 6 months. This advantage holds true even if you are on a higher maintenance dose of semaglutide than the typical tirzepatide dose. Consult your doctor to determine which medication aligns best with your health profile and insurance coverage.