Browse the evidence

Laparoscopic bariatric surgery (specifically RYGB and SG) produces greater weight loss and higher rates of type 2 diabetes remission compared to non-surgical interventions, including lifestyle changes and GLP-1 receptor agonists.

For severe obesity, laparoscopic surgery (like gastric bypass or sleeve) currently offers the highest chance of significant, sustained weight loss (20-30%) and diabetes remission compared to drugs or diet alone. However, it requires lifelong vitamin supplementation and carries surgical risks. New medications (GLP-1s) are closing the gap, offering 15-20% loss, but surgery remains the most effective option for those who qualify.

High-intensity physical activity significantly reduces the risk of metabolic dysfunction-associated steatotic liver disease (MASLD) in individuals with stable obesity, whereas high-intensity activity combined with significant net weight gain (>20 kg) paradoxically increases MASLD risk compared to lower intensity activities.

If you have stable obesity, high-intensity exercise (over 1200 MET min/week) is significantly better for your liver than low-intensity activity. However, if you are gaining a lot of weight (>20kg) over time, high-intensity exercise might actually increase your liver disease risk compared to moderate or low intensity. Focus on maintaining stable weight with high intensity, or use moderate intensity if you are struggling with weight gain.

Transitioning from non-obese to obese status or maintaining obesity significantly increases the risk of MASLD, with risk escalating with age and magnitude of weight gain.

Gaining weight, especially transitioning from a normal weight to obese, drastically increases your risk of fatty liver disease. The more weight you gain (especially >20kg), the higher the risk. Maintaining a stable, non-obese weight is the most protective strategy.

A Moderate Carbohydrate-Low Protein (MCLP) diet is the most effective macronutrient ratio for reducing triglycerides compared to a moderate fat-low protein (MFLP) control diet.

If your main health concern is high triglycerides rather than weight loss, a diet with moderate carbohydrates (30-50% of calories) and low protein (≤30% of calories) is likely more effective than very low-carb diets. This ratio outperforms standard moderate-fat diets for this specific lipid marker.

Adherence to a low-carbohydrate diet (defined as ≤130g carbs/day or ≤25% calories) is sustainable long-term and nutritionally adequate, with high adherence rates reported in observational surveys.

To sustain a low-carbohydrate diet long-term, focus on the high satiety provided by fats and proteins. This natural hunger control makes the diet easier to maintain than calorie-restricted low-fat diets. Ensure your diet includes a variety of whole foods to meet all vitamin and mineral needs, as low-carb diets can be nutritionally complete.

In asymptomatic individuals with Type 2 Diabetes (T2D) and obesity, alternative cardiopulmonary exercise testing (CPET) indices—specifically oxygen uptake recovery, heart rate recovery, and oxygen uptake at the ventilatory threshold—are significantly impaired compared to healthy controls and are independently associated with markers of subclinical cardiovascular dysfunction (aortic stiffness, diastolic dysfunction, and microvascular impairment).

If you have Type 2 Diabetes and are overweight, standard fitness tests might not tell the whole story about your heart health. Specific recovery metrics after exercise (how fast your oxygen use and heart rate drop) and your ventilatory threshold are better indicators of early heart stress. These markers can help identify who is at risk for developing heart failure before symptoms appear, allowing for earlier lifestyle or medical intervention.

Intermittent fasting (IF) promotes weight loss and metabolic health by inducing ketosis, improving insulin sensitivity, and regulating hunger hormones.

Try intermittent fasting, such as time-restricted eating (e.g., 16:8), to promote ketosis and regulate hunger hormones. It can be as effective as caloric restriction for weight loss.

Intermittent fasting (IF) produces a statistically significant greater reduction in Body Mass Index (BMI) compared to continuous energy restriction (ER), although the absolute difference in total body weight loss is not statistically significant.

If you are trying to lose weight, intermittent fasting may help you reduce your BMI slightly more than just counting calories every day, even if the scale doesn't move much faster. Try a 16:8 schedule (fast for 16 hours, eat within 8 hours) or alternate-day fasting. Be aware that you might feel dizzy, while those just cutting calories might get more headaches. The key is consistency with whichever method you choose.

Intermittent fasting and continuous energy restriction produce similar improvements in blood pressure (systolic and diastolic), LDL cholesterol, and HDL cholesterol, with no statistically significant differences between the two methods.

If your goal is to lower blood pressure or improve cholesterol, you do not need to fast. Reducing your overall calorie intake through standard dieting is just as effective as intermittent fasting for these specific heart health markers. Focus on the total amount of food you eat rather than when you eat it for these outcomes.

Intermittent fasting and continuous energy restriction produce similar improvements in fasting plasma glucose levels, with no statistically significant difference between the two methods.

If your goal is to improve blood sugar levels, you do not need to fast. Reducing your overall calorie intake through standard dieting is just as effective as intermittent fasting for glycemic control. Focus on the total amount of food you eat rather than when you eat it for these outcomes.

The Swallowable Gastric Balloon Program (SGBP) combined with remote monitoring maintains 95% of total body weight loss (TBWL) one year after the device naturally passes, achieving a mean 13.2% TBWL.

If you are avoiding surgery, a swallowable gastric balloon combined with a strict remote monitoring program (app, scale, regular check-ins) can help you lose about 13% of your body weight and keep it off for at least a year after the device passes naturally. Success depends heavily on sticking to the behavioral program and using the provided digital tools for accountability.

Lactobacillus sp. supplementation significantly decreases leptin levels and increases adiponectin levels in non-comorbid obese individuals.

Lactobacillus supplementation may help improve your hormonal profile by lowering leptin (which can promote fat storage) and raising adiponectin (which improves insulin sensitivity and fat burning). This hormonal shift supports weight management efforts.

Ketogenic diets are effective for fat mass reduction but are less effective than carbohydrate-rich diets for muscle mass gain, potentially due to reduced testosterone and IGF-1 levels.

If your main goal is to build muscle, avoid ketogenic diets as they may hinder growth. If your goal is fat loss, keto works, but monitor your strength training performance.

Intermittent Fasting (IF) produces weight loss comparable to continuous caloric restriction, but is generally not recommended for Type 2 Diabetes patients due to hypoglycemia risk.

Intermittent fasting can help you lose weight just as well as counting calories every day. However, if you have Type 2 Diabetes, do not try this without a doctor's supervision due to the risk of low blood sugar.

Combining 16:8 time-restricted eating (TRE) with structured exercise yields modest additional reductions in body weight and fat mass compared to exercise alone.

If you already exercise regularly, adding a 16:8 time-restricted eating schedule (fasting for 16 hours, eating within 8 hours) may help you lose an extra 1-1.5 kg of body weight and about 1 kg of fat mass over 4-8 weeks compared to exercising without dietary timing restrictions. This benefit is modest but real, particularly if you perform aerobic exercise.

Aerobic exercise combined with 16:8 TRE yields greater reductions in body weight and fat mass than resistance training combined with 16:8 TRE.

If you prefer resistance training, adding 16:8 TRE may still help with fat loss, but the additional benefit from TRE appears greater when combined with aerobic exercise. For maximal short-term fat loss with TRE, aerobic exercise may be the more synergistic choice.

Probiotics (specifically Lactobacillus and Bifidobacterium strains) improve gastrointestinal health by modulating the immune system, enhancing epithelial barriers, and suppressing pathogen adhesion.

To support gut health, consider incorporating probiotic-rich foods or supplements containing Lactobacillus or Bifidobacterium strains. These microbes help maintain the gut barrier and support immune function. If you are immunocompromised, consult a doctor first to ensure the specific strain is safe for you.

Synbiotics (combining probiotics and prebiotics) improve the survival and efficacy of probiotics in the gastrointestinal tract compared to probiotics alone.

If you take probiotics, consider a synbiotic formulation that includes prebiotics (like oligosaccharides). This combination helps the probiotic bacteria survive stomach acid and colonize the gut more effectively.

Berberine (BBR) shows multi-target anti-obesity actions in preclinical models (AMPK activation, gut microbiota modulation) but suffers from poor oral bioavailability (<5%) and lacks sufficient clinical validation for obesity.

Berberine is a natural compound with preclinical evidence for weight loss, but it has very low absorption in the body (<5%) and hasn't been proven effective in large clinical trials for obesity. While safe for other uses, it is not yet a recommended treatment for weight loss.

GLP-1 receptor agonists are associated with a rapid worsening of diabetic retinopathy, particularly in patients with a history of retinopathy and those using insulin, likely due to rapid glycemic improvement.

If you have diabetes and are starting a GLP-1 medication, ensure you have regular eye exams. If you already have eye problems, your doctor may monitor you more closely, as rapid blood sugar improvement can temporarily worsen vision.

GLP-1RA users tend to overconsume saturated fat and total fat percentages, potentially exacerbating gastrointestinal side effects like nausea and constipation.

You are likely eating too much saturated fat, which can worsen nausea and constipation common with GLP-1RA. Try to shift some calories from fats to fiber-rich carbohydrates and protein to improve GI comfort and nutrient density.

A higher polygenic score for BMI is associated with lower weight loss following bariatric surgery, although the effect size is modest and attenuates in sensitivity analyses.

If you are considering bariatric surgery, having a high genetic risk for obesity might mean you lose slightly less weight than someone with low genetic risk. However, the surgery is still very effective. You may need to be more vigilant with lifestyle changes or consider adjunct therapies like GLP-1 RAs to maintain your results.

GLP-1RAs activate neurons in the paraventricular nucleus (PVH) and ventromedial hypothalamus (VMH) to suppress food intake and increase energy expenditure or thermogenesis.

GLP-1 medications also target other brain regions (PVH and VMH) to suppress food intake and increase energy expenditure. This helps explain why these medications can lead to weight loss even without significant changes in diet or exercise.

Continuing lifestyle interventions (diet/exercise) after stopping AOMs does not prevent significant weight regain, as this subgroup also showed significant regain.

Even if you maintain a healthy diet and exercise routine, stopping anti-obesity medication is likely to lead to weight regain. The biological effects of the medication are significant, and lifestyle changes alone may not be enough to counteract the regain.