Browse the evidence

The presence of cardiovascular (CV) or metabolic comorbidities significantly reduces health-related quality of life (HRQoL) and work productivity in people with overweight or obesity, often more so than BMI alone.

Having overweight or obesity is only part of the story. If you also have heart or metabolic conditions (like diabetes), your quality of life and work productivity are likely significantly lower than someone with the same BMI but no comorbidities. Treating these specific conditions is crucial for your well-being.

People with overweight or obesity and metabolic comorbidities experience significantly higher work impairment (activity impairment and presenteeism) compared to those without such comorbidities.

If you have overweight or obesity and metabolic conditions like diabetes, your work productivity is likely significantly lower than someone with the same BMI but no metabolic issues. This is due to reduced activity levels and effectiveness at work, which are key targets for treatment.

Current interventions, including calorie restriction, physical activity, and pharmacological treatment, show promise in combating obesity, but long-term efficacy and safety need further establishment.

There is no single magic bullet for obesity. The most promising approach combines lifestyle changes (diet and exercise) with medical treatments if necessary. However, long-term success is not guaranteed, and ongoing management is likely required.

Tirzepatide, a dual GLP-1/GIP agonist, may enhance metabolic efficiency and endurance performance by optimizing fat oxidation, delaying glycogen depletion, and improving mitochondrial function.

If you are an endurance athlete using tirzepatide, you may experience improved metabolic efficiency. The drug can help spare glycogen stores and enhance mitochondrial function, potentially supporting longer exercise durations. However, monitor for signs of hypoglycemia during high-intensity training and ensure adequate carbohydrate intake to counteract potential energy deficits.

Tirzepatide is a broadly acceptable and preferred long-term treatment for comorbid obesity and obstructive sleep apnea (COBOSA) by patients, offering efficacy comparable to CPAP with different adherence profiles.

If you have obesity and sleep apnea, tirzepatide is a valid, once-weekly treatment option that many patients prefer over CPAP. Discuss with your doctor if it's right for you, considering factors like cost, side effects, and your preference for injections vs. devices.

Reallocating 30 minutes of daily sedentary time to moderate-to-vigorous physical activity (MVPA) in young, healthy, active adults increases daily energy intake by approximately 113–120 kcal and alters appetite hormones (higher fasting ghrelin, lower postprandial PYY) to compensate for energy expenditure, without affecting hedonic food reward traits.

If you are already active and healthy, increasing your moderate-to-vigorous exercise by 30 minutes a day will likely make you hungrier and cause you to eat about 120 more calories. This is your body's natural way of balancing energy. To manage weight, you must consciously account for this increased intake rather than assuming exercise alone creates a deficit. If your goal is performance, use this hunger to fuel your activity.

Referral to a specialized weight management clinic alongside incretin-based therapy does not significantly improve early glycemic (A1c) or lipid (LDL) outcomes compared to standard diabetes care alone, but increases weight loss only when patients attend 4 or more visits.

If you are starting a GLP-1 or similar medication, standard diabetes care provides similar early blood sugar and cholesterol benefits as specialized weight management clinics. However, to maximize weight loss, you likely need to attend 4 or more specialized weight management visits. Simply getting the prescription and seeing the specialist once may result in less weight loss than standard care alone.

Second-generation incretin-based therapies (semaglutide, tirzepatide) increase the risk of micronutrient deficiencies and related complications, primarily through reduced dietary intake and altered food selection, with real-world data showing a 22.4% incidence of recorded nutritional deficiencies at 12 months.

If you are taking semaglutide or tirzepatide, your reduced food intake may lead to micronutrient gaps. Prioritize nutrient-dense foods (vegetables, lean proteins, dairy) and consider discussing baseline testing (Vitamin D, B12, Iron) with your doctor, especially if you experience GI side effects or rapid weight loss.

Incretin-based therapies alter dietary patterns by reducing cravings for high-fat and sugary foods, which may displace micronutrient-dense food groups if not actively managed.

You may naturally crave less junk food. Use this opportunity to fill your plate with vegetables and lean proteins to ensure you get enough vitamins and minerals.

GLP-1 receptor agonist use during radiation therapy causes rapid weight loss and anatomic changes that compromise immobilization reproducibility and dosimetric accuracy, necessitating adaptive radiotherapy or temporary holding of the medication.

If you are taking GLP-1 drugs (like Ozempic or Wegovy) while getting radiation, tell your radiation team immediately. These drugs cause weight loss and stomach changes that can make your radiation treatment less accurate. Your team may ask you to pause the drug or scan you more often to adjust the treatment plan. This is to keep you safe and ensure the radiation hits the tumor correctly.

Dose de-escalation (tapering) or low-dose maintenance therapy may modestly limit the rate and magnitude of weight regain compared to abrupt cessation, but robust randomized evidence is currently lacking.

If you want to stop your incretin medication, talk to your doctor about tapering the dose or extending the time between injections rather than stopping abruptly. While this might help slow down weight regain, it is not a guaranteed solution, and you should expect some regain. Continuing at a lower dose is generally better than stopping completely.

Nutrient-stimulated hormone (NuSH) therapies, including GLP-1 and dual/tri-agonists, produce significant weight loss and cardiometabolic improvements in real-world settings, though response heterogeneity, high discontinuation rates, and post-cessation weight regain remain unresolved challenges.

NuSH therapies (like semaglutide or tirzepatide) are highly effective for significant weight loss and metabolic health in real-world use, but they are not magic bullets. Expect a significant portion of people to not respond well, experience side effects leading to stopping the drug, or regain weight after stopping. Success requires individualized dosing, lifestyle support, and an understanding that obesity management is often a long-term commitment rather than a quick fix.

β-hydroxy-β-methylbutyrate (HMB, 3 g/day) has conditional utility for muscle hypertrophy, showing benefits primarily during high training stress or caloric deficits, but is largely neutral in well-fed, resistance-trained individuals.

If you are dieting or doing extremely high-volume training, 3g of HMB daily might help preserve muscle. If you are eating well and training normally, HMB is likely a waste of money as it shows no benefit in this group.

Adjunct supplements (omega-3 fatty acids, citrulline, collagen) facilitate training tolerance, recovery, or connective-tissue adaptation but do not directly drive muscle hypertrophy.

These supplements can help you train better, recover faster, or keep your tendons healthy, but they won't build muscle directly. Focus on protein, creatine, and training first; these are optional extras for specific needs.

Systematic evaluation of nutrition claims on Instagram targeting women reveals widespread misinformation and low scientific rigor, necessitating evidence-based digital platforms to improve health literacy.

If you are a woman seeking nutrition advice on Instagram, be aware that many posts lack scientific rigor. Use platforms like NutriWomen that systematically evaluate these claims using scientific methods (like AMSTAR-2 and GRADE) to provide you with trustworthy, accessible summaries. Do not rely solely on influencer posts without checking for evidence-based backing.

In individuals with MASLD undergoing ~30% caloric restriction, resistance training preserves skeletal muscle mass and improves functional strength, whereas adding whey protein supplementation (1.5 g/kg/day) provides no additional benefit over resistance training alone (0.8 g/kg/day).

If you have MASLD and are cutting calories significantly, focus on resistance training and getting adequate protein (around 0.8 g/kg/day). Adding extra whey protein (up to 1.5 g/kg/day) does not provide extra muscle or strength benefits in this specific scenario. The energy deficit blunts the potential synergy of high protein and exercise.

Performing knee extension resistance training 2 times per week yields superior patellar tendon force (strength) adaptations compared to 4 times per week when total training volume is equated.

If you are recreationally trained and want to improve tendon strength, doing knee extensions 2 times a week with high volume (to failure) may be more effective for force production than doing them 4 times a week, provided you match the total number of sets. The key is likely the longer duration of the training block (8 weeks vs 4 weeks) allowed for better adaptation.

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.

GLP-1 receptor agonists (GLP-1RAs), such as semaglutide, reduce 'food noise' (heightened, persistent food cue reactivity and food-related intrusive thoughts), which contributes to reduced energy intake and weight loss.

If you struggle with constant thoughts about food ('food noise') that make dieting hard, GLP-1 medications like semaglutide may help quiet those thoughts. This isn't just about feeling full; it's about reducing the mental obsession with food. Talk to your doctor about whether this medication is right for you, especially if you have a history of depression, as monitoring is important.

Personalized nutrition, incorporating genetic analysis (SNPs), gut microbiota assessment, and chrono-nutrition, is an effective preventive measure against atherosclerosis, superior to generic dietary advice.

To prevent atherosclerosis, move beyond generic diets. Consider getting genetic testing (SNPs) and gut microbiota analysis to tailor your diet. Focus on foods that support your specific genetic profile and gut health, such as those rich in antioxidants and anti-atherosclerotic substances.

Specific biologically active substances (BAS) such as baicalin, resveratrol, curcumin, quercetin, squalene, coenzyme Q10, and omega-3 exhibit anti-atherosclerotic potential and can be used as functional foods or supplements.

Consider incorporating functional foods or supplements containing baicalin, resveratrol, curcumin, quercetin, squalene, coenzyme Q10, or omega-3 to support heart health and prevent atherosclerosis.