Browse the evidence

Long-term lifestyle interventions significantly improve weight loss compared to control groups, with effects ranging from -0.5 to -11.5 kg at 2 years or longer.

Sustained weight loss is achievable with long-term lifestyle changes. Interventions that include a clear caloric deficit, behavior therapy, and potentially meal replacements are most effective for maintaining weight loss over 2+ years.

A structured weight loss program providing free prepared meals and incentivized counseling significantly increases weight loss and maintenance compared to usual care in overweight/obese women.

To achieve significant and sustained weight loss, consider a structured program that provides prepackaged meals and regular counseling. This study shows that removing the burden of meal planning and providing financial incentives for attendance can lead to nearly 8% body weight loss over two years, far exceeding standard self-directed efforts. While commercial programs have costs, the structural support (food + counseling) is key to adherence.

Pramlintide (120 mcg t.i.d. or 360 mcg b.i.d.) combined with lifestyle intervention produces greater initial weight loss and enhances long-term maintenance of that weight loss over 12 months compared to lifestyle intervention alone in obese subjects.

If you are obese and struggling to maintain weight loss, adding pramlintide (120 mcg three times daily or 360 mcg twice daily) to a structured lifestyle program (diet and exercise) can help you lose more weight initially and, crucially, keep it off for at least a year. The medication is taken as a small injection before meals. While nausea is a common side effect, it is usually mild, decreases over time, and does not prevent weight loss. This approach is for non-diabetic obese individuals without other major health exclusions.

For weight loss in obese individuals, creating an energy deficit of approximately 500 kcal/day is effective, whereas the specific macronutrient composition (ratios of fat, carbohydrate, and protein) is of secondary importance.

To lose weight, create a daily calorie deficit of about 500 kcal. You do not need to follow a specific diet type (like keto or vegan); focus on eating foods with low energy density (high water/fiber) to stay full. Aim for a loss of 0.5 kg per week over 12-24 weeks.

Bariatric surgery is more effective than conservative treatment for reducing body fat, improving obesity-related diseases, and lowering mortality in extremely obese patients (BMI ≥40 or ≥35 with comorbidities).

If you have a BMI of 40 or higher, or 35 or higher with serious health issues like diabetes, and lifestyle changes haven't worked, bariatric surgery is the most effective option for significant weight loss (20-40 kg) and improving your long-term health and survival chances.

A structured, interdisciplinary 52-week non-surgical obesity program utilizing a 12-week low-calorie diet (800 kcal/day) followed by maintenance phases significantly reduces body weight, waist circumference, and the prevalence of metabolic syndrome and hypertension in adults with obesity grades I-III.

For individuals with obesity (BMI ≥30), a medically supervised program combining a 12-week very low-calorie diet (800 kcal/day) with structured behavioral counseling and exercise can lead to significant, sustained weight loss (approx. 14-19 kg) and improvement in metabolic health markers like blood pressure and metabolic syndrome. Success requires commitment to a structured, multi-phase program lasting one year, not just short-term dieting.

A stepped-care weight loss intervention (STEP) achieves clinically meaningful weight loss comparable to standard behavioral weight loss (SBWI) but at significantly lower cost.

If you are struggling with weight loss, a stepped-care approach might be a good option. You start with less frequent contact (e.g., monthly group sessions) and only increase the intensity (e.g., more frequent calls or individual sessions) if you aren't meeting your weight loss goals. This can save you time and money while still achieving significant weight loss, though you might lose slightly less weight than with a very intensive program.

Greater weight loss in the first year (≥5%) is a consistent independent predictor of long-term weight loss maintenance across all intervention groups (metformin, ILS, and placebo).

Focus on getting that first 5% weight loss. It is the single best predictor of whether you will keep it off for years, regardless of whether you use medication, diet, or exercise. Don't get discouraged if you don't lose a huge amount immediately; consistency in that first year matters most.

Adopting a plant-based vegan diet for 16 weeks significantly reduces body weight, fat mass, and insulin resistance (HOMA-IR) in overweight individuals compared to maintaining a standard omnivorous diet.

Switch to a whole-food, plant-based diet (vegetables, grains, legumes, fruits) with minimal added oils for 16 weeks. You do not need to count calories strictly, but focus on replacing animal proteins with plant sources. This approach has been shown to significantly reduce body weight and improve insulin resistance in overweight adults.

Continued structured support for weight loss maintenance in type 2 diabetes remission significantly reduces the incidence of moderate/major adverse cardiovascular events (MMACE) compared to standard care, with the benefit persisting over 5 years.

If you have achieved type 2 diabetes remission through weight loss, do not stop your efforts. The study shows that continuing structured support and maintaining your weight loss significantly lowers your risk of heart attacks and strokes over the next 5 years. Treat remission as a long-term commitment, not a one-time fix.

Consumption of sugar-sweetened beverages (SSBs) increases the risk of obesity, metabolic syndrome, and type 2 diabetes because liquid calories do not suppress subsequent food intake, leading to a net caloric surplus.

Stop drinking sugar-sweetened beverages. Because they are liquid, your body does not register them as food, so you do not eat less later. This leads to extra calories and weight gain. Switch to water or unsweetened drinks to reduce obesity risk.

Consuming two 16-ounce sugar-sweetened beverages daily for six months induces features of metabolic syndrome and non-alcoholic fatty liver disease (NAFLD), including increased liver fat and visceral fat.

Drinking two large sugary sodas a day for six months can cause fatty liver and metabolic syndrome. To avoid this, limit sugary drinks to zero or replace them with water.

Long-term weight loss maintenance is primarily driven by behavioral adherence and diet quality rather than specific macronutrient ratios, as physiological adaptations (increased hunger, decreased energy expenditure) create a strong biological resistance to weight loss that is best overcome by sustainable, high-quality dietary patterns.

Stop obsessing over whether your diet is low-carb or low-fat. Focus on eating whole, unprocessed foods (vegetables, fruits, whole grains) and maintaining a caloric deficit. Expect your body to fight back with increased hunger; this is normal. Manage it by prioritizing food quality and behavioral consistency over strict macronutrient counting.

Diet quality (minimally processed, whole foods) is a primary driver of weight loss independent of caloric restriction or macronutrient composition, as demonstrated by the DIETFITS trial.

Focus on eating whole, unprocessed foods (vegetables, fruits, whole grains) and minimizing added sugars and processed items. You do not need to strictly count calories if you prioritize diet quality, as this approach can lead to significant weight loss.

Intensive medical management combining a 12-week low-calorie liquid diet, behavioral counseling, and pharmacotherapy enables primary care patients with extreme obesity (BMI 40-60) to achieve clinically significant weight loss (mean 8.3% at 2 years) superior to usual care.

For patients with extreme obesity (BMI 40-60), primary care-based intensive medical management involving a short-term liquid diet, behavioral counseling, and medication can lead to significant weight loss (average 8.3% over 2 years). While about half of patients may drop out, those who remain in the program achieve clinically meaningful benefits, challenging the view that only surgery is effective for this population.

Substituting sucrose with aspartame in foods and beverages results in a significant reduction in daily energy intake and a modest but meaningful rate of weight loss (approximately 0.2 kg/week) in adults.

To lose weight using aspartame, replace your sugary drinks and foods with aspartame-sweetened versions. You don't need to change anything else. Expect to lose about 0.2 kg (0.4 lbs) per week. This is a slow but steady loss that, over a year, can prevent the typical weight gain seen in adults.

A combined workplace intervention consisting of a 1200 kcal/day energy deficit, strengthening exercises, and cognitive behavioral training significantly reduces body weight, BMI, body fat percentage, waist circumference, and blood pressure in overweight female healthcare workers over a 3-month period.

To lose weight effectively, create a sustainable calorie deficit (e.g., 1200 kcal/day below your maintenance needs) and combine it with regular physical activity. Incorporate strength training to preserve muscle mass and cognitive strategies to manage hunger and maintain motivation. Integrating these habits into your daily routine, such as during work breaks, can improve adherence and long-term success.

A ketogenic diet (defined as <50g carbohydrates/day) significantly improves body weight, waist circumference, HbA1c, triglycerides, and HDL levels in overweight patients with Type 2 Diabetes Mellitus compared to other dietary interventions.

For overweight individuals with Type 2 Diabetes, adopting a ketogenic diet (under 50g carbs daily) is a highly effective strategy for losing weight and improving blood sugar control. This approach also tends to improve heart health markers like HDL and triglycerides, addressing common concerns about high-fat diets. Consult a doctor to manage medications, as blood sugar levels may drop significantly.

Combining increased physical activity with improved eating behaviors yields significantly greater long-term weight loss than either intervention alone, with eating behavior changes being the primary driver of weight loss.

To lose weight and keep it off, you must change both what you eat and how much you move. Focus heavily on building healthy eating habits (like planning meals and monitoring intake) as these drive the most weight loss. Add exercise (aiming for 200 minutes per week) to boost results, but do not rely on exercise alone to offset poor dietary choices.

Alternate day fasting (ADF) and modified ADF (MADF) are the most effective intermittent fasting regimens for weight loss, ranking higher than caloric energy restriction (CER) and time-restricted eating (TRE).

If your goal is maximum weight loss using intermittent fasting, Alternate Day Fasting (either zero-calorie or modified) appears to be the most effective strategy compared to Time-Restricted Eating or the 5:2 diet. However, adherence drops in longer studies, so consistency is key.

Consuming non-nutritive sweetened (NNS) beverages during a behavioral weight loss program results in significantly greater weight loss compared to consuming water.

If you are following a structured weight loss program, drinking at least 24 ounces of non-nutritive sweetened beverages (like diet soda or sugar-free drinks) daily can help you lose more weight than drinking water alone. This approach may help manage hunger and improve adherence to your diet plan. You do not need to avoid artificial sweeteners; they can be a useful tool for weight loss.

Combining a modestly hypocaloric diet (500 kcal/day deficit) with moderate-intensity aerobic or resistance exercise (30-60 min, 3-5 days/week) is the most effective lifestyle intervention for reducing hepatic steatosis and improving NAFLD markers.

To improve your liver health, aim to lose 5-10% of your body weight. Do this by eating 500 calories less per day than your body needs, combined with 30-60 minutes of moderate exercise (like brisk walking) on 3 to 5 days a week. This combination is proven to be more effective than diet or exercise alone for reducing liver fat.

Sustained long-term weight loss (over 2 years) is the strongest predictor for reducing type 2 diabetes incidence and improving cardiometabolic traits, whereas weight cycling (repeated 5-lb weight fluctuations) independently increases diabetes risk and worsens blood pressure and insulin resistance.

To prevent type 2 diabetes, focus on maintaining a sustained weight loss of at least 7% of your body weight over two years, rather than just losing weight quickly in the first few months. Additionally, avoid 'weight cycling' (repeatedly losing and regaining 5+ pounds), as this pattern independently increases your risk of diabetes and high blood pressure, even if you eventually lose the weight. Consistency and long-term maintenance are more important than rapid initial results.

Adherence to a prescribed caloric reduction is the primary determinant of weight loss success, regardless of the specific macronutrient composition of the diet.

Stop looking for the 'perfect' diet. Whether you choose low-carb, low-fat, or portion-controlled, the key to losing weight is sticking to a calorie deficit. Choose the eating pattern you can maintain long-term, as adherence is the main driver of success, not the specific macronutrients.