Browse the evidence

High consumption of ultra-processed foods does NOT significantly increase the risk of incident obesity (BMI ≥ 30 kg/m²) in individuals who are already overweight (BMI 25-30 kg/m²) at baseline.

For those already overweight, simply reducing UPF may not be enough to prevent progression to obesity; other lifestyle factors may play a larger role.

The reduction in sympathetic activity (norepinephrine spillover) following weight loss is independently associated with the reduction in plasma leptin concentrations, suggesting leptin mediates this effect.

Weight loss improves heart health partly by lowering leptin levels, which in turn calms overactive sympathetic nerve signals. This suggests that managing leptin sensitivity is crucial for cardiovascular health in metabolic syndrome.

Intentional weight loss does not significantly reduce the risk of cardiovascular events (heart failure, atrial fibrillation, unstable angina/MI) compared to maintaining a high stable BMI, likely due to insufficient follow-up duration or irreversible cardiac remodeling.

Losing weight improves your blood pressure, cholesterol, and blood sugar, which are key risk factors for heart disease. However, this study suggests that the actual reduction in heart attacks, strokes, or heart failure risk may not be immediately visible, possibly because heart damage takes time to reverse. Continue managing your weight and risk factors, as the long-term benefit for cardiovascular health is likely to follow the improvement in risk markers.

Increasing dairy calcium intake to 1400 mg/day (via high-dairy diet) does not enhance weight loss or fat loss compared to a moderate calcium intake of 800 mg/day when both groups are in a caloric deficit.

If you are trying to lose weight by eating less, eating four servings of dairy a day won't help you lose more fat than eating two servings. Stick to a moderate amount of dairy (around 800mg calcium) and focus on maintaining your calorie deficit.

A diet high in fiber and low in glycemic index does not enhance weight loss or fat loss compared to a standard diet when both are in a caloric deficit.

Eating a low-glycemic, high-fiber diet won't help you lose more weight than a standard diet if you are already eating fewer calories. Focus on the total calorie deficit rather than strictly avoiding high-glycemic foods.

Prolonged energy restriction induces adaptive thermogenesis, causing resting energy expenditure (REE) to fall significantly more than predicted by changes in body composition alone, thereby creating an energetic efficiency that hinders weight loss.

When you diet, your body doesn't just burn less energy because you are smaller; it actively becomes more efficient, burning even less than expected for your new size. This 'adaptive thermogenesis' is strongest during the active weight loss phase. If you hit a plateau, it may be because your body has adapted to the deficit. Recognizing this biological defense mechanism can help you adjust your strategy (e.g., slight diet breaks or resistance training) rather than assuming you are failing.

Adaptive thermogenesis is primarily driven by the energy deficit itself rather than the resulting loss of body mass, as evidenced by the early onset of reduced REE before significant body composition changes occur.

Your body starts saving energy almost immediately when you cut calories, even before you lose much weight. This suggests the act of eating less triggers the metabolic slowdown, not just the fact that you are lighter.

Low-carbohydrate diets do not increase energy expenditure (resting metabolic rate, thermic effect of food, or physical activity) compared to low-fat diets, and thus cannot explain the greater weight loss observed in low-carbohydrate dieters.

If you are losing more weight on a low-carb diet than a low-fat diet, it is not because your body is burning more calories. Your resting metabolism and the energy cost of digesting food are similar to those on a low-fat diet. The difference likely comes down to how much you actually eat, which may be harder to track accurately on a restricted low-fat diet.

Adding personalized e-feedback and reminder calls to a basic commercial web-based weight loss program does not result in greater weight loss or BMI reduction compared to the basic program alone after 12 weeks.

You do not need to pay for enhanced features like personalized feedback or reminder calls to lose weight. The basic program is sufficient for weight loss. Enhanced features might help you stay in the program longer, but they won't make you lose more weight in the first 12 weeks.

The improvement in LDL kinetics (increased catabolism) following weight loss is inversely correlated with reductions in plasma Retinol-Binding Protein-4 (RBP-4).

Lowering your body fat reduces a protein called RBP-4. This reduction helps your body clear 'bad' LDL cholesterol more efficiently, which is a key benefit of weight loss for heart health.

In obese men with metabolic syndrome, weight loss decreases HDL apoA-I production and catabolism by equal amounts, resulting in no net change in plasma HDL cholesterol concentrations.

Don't be discouraged if your HDL numbers don't jump after losing weight. This study shows that weight loss can improve how your body handles cholesterol (LDL) without necessarily raising HDL levels, which is still beneficial for heart health.

Mobile phone interventions for type 2 diabetes do not significantly improve HbA1c levels compared to control groups, although they may improve self-management skills when combined with health counseling.

Using a mobile app to track your diabetes may not significantly lower your HbA1c on its own. However, combining it with health counseling can improve your self-management skills. Focus on using the app consistently and seeking support.

Pharmacotherapy for obesity is generally recommended only for individuals with BMI >27 kg/m2 and serious comorbidities who have failed diet and exercise, and most drugs are for short-term use.

If you have a BMI over 27 and serious health issues like diabetes, and lifestyle changes haven't worked, talk to your doctor about prescription weight loss drugs. These are for short-term use and work best when combined with diet and exercise. Avoid over-the-counter supplements as their effectiveness and safety are not proven.

Caloric restriction alone produces significant reductions in liver enzymes (ALT and GGT) in obese metabolic syndrome subjects, and adding moderate-intensity aerobic exercise training provides no incremental benefit on these liver markers.

If you have metabolic syndrome and high liver enzymes, focus on losing weight through a caloric deficit and reducing saturated fats. You do not need to add intense exercise to see improvements in your liver enzymes; diet alone is sufficient for this specific outcome.

Vegan diets do not significantly affect blood pressure, HDL-C, or triglycerides compared to control diets in individuals with overweight or type 2 diabetes.

Do not expect a vegan diet to automatically lower your blood pressure or triglycerides if they are currently normal or if the diet is not carefully managed. The primary benefits observed were weight loss, improved HbA1c, and reduced LDL cholesterol. Monitor your BP and triglycerides separately.

Alternate-day fasting does not significantly improve high-density lipoprotein (HDL), fasting blood sugar (FBS), or homeostasis model assessment-insulin resistance (HOMA-IR) compared to control groups in the short term.

While ADF helps with weight and cholesterol, you should not expect it to automatically fix your blood sugar or insulin resistance in the short term (under 12 weeks). If you have insulin resistance, you may need to combine ADF with exercise or other strategies.

In weight-stable interventions, low-fat diet and exercise do not independently improve metabolic syndrome scores; the improvement is entirely mediated by the loss of percent body fat.

If you are doing a low-fat diet or exercising to fix metabolic syndrome, the benefit you see is likely due to the small amount of body fat you lost, not the diet or exercise itself. If you cannot lose body fat, these specific interventions may not improve your metabolic syndrome score. Focus on achieving fat loss, regardless of the method.

Phentermine/Topiramate increases the risk of psychological side effects including depression, anxiety, sleep disorders, and irritability.

Avoid Phentermine/Topiramate if you have a history of psychiatric disorders, as it increases the risk of anxiety, sleep issues, and irritability. Other options like Tirzepatide or Semaglutide may be safer for mental health.

Exercise intervention alone (4x 45-min walks at 60-70% max heart rate) during lactation does not significantly improve cardiovascular risk factors (blood lipids, insulin, blood pressure) or VO2 max in overweight/obese women.

For postpartum women, moderate-intensity walking alone (4x 45 mins/week) may not be sufficient to improve cardiovascular risk factors or fitness levels. While it is a healthy activity, it did not drive metabolic improvements in this study, whereas dietary changes did. Focus on diet for metabolic health improvements in this specific population.

Low-glycemic index (GI) diets do not provide a significant benefit for long-term weight control or body fat reduction compared to high-GI diets when energy density and palatability are matched.

Do not rely on glycemic index labels for weight loss. Focus on eating whole, fiber-rich carbohydrates like vegetables, fruits, and whole grains instead of trying to calculate the GI of your meals.

Time-restricted eating (TRE) does not significantly preserve lean body mass compared to control groups in adults with obesity.

Don't worry that TRE will cause you to lose muscle faster than a standard diet. The evidence shows lean mass loss is similar to control groups. Focus on protein intake and strength training to preserve muscle, as TRE itself doesn't offer a specific advantage in this regard.

Augmenting a hypocaloric ketogenic diet with exogenous ketone salts does not improve body composition outcomes (weight loss, fat loss, or lean mass preservation) compared to a ketogenic diet alone.

If you are doing a ketogenic diet for weight loss, adding exogenous ketone salts will not help you lose more fat or keep more muscle compared to doing the diet without them. The diet itself is the driver of body composition changes. You can save money by skipping the ketone salts.

Fatmax training does not increase fat-free mass (muscle mass) in obese individuals.

Do not expect muscle growth from Fatmax training alone. It preserves muscle while losing fat, but you need resistance training to build muscle.

Tirzepatide significantly increases the risk of gastrointestinal adverse events, including nausea, vomiting, and diarrhea, compared to placebo.

Be prepared for potential stomach issues like nausea, vomiting, and diarrhea when starting tirzepatide. These side effects are common and significantly more likely than with a placebo. Starting at a low dose and increasing slowly can help your body adjust. If side effects are severe, talk to your doctor about adjusting your dose or stopping the medication.