Browse the evidence

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.

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.

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.

A pinitol-enriched beverage (PEB) derived from carob pods significantly reduces blood glucose levels in individuals with impaired glucose tolerance (IGT) compared to a sucrose-enriched beverage (SEB).

If you have impaired glucose tolerance, substituting your regular sugary drinks with a pinitol-enriched beverage (containing ~4g pinitol per 500ml) for 6 weeks may help lower your fasting blood glucose levels compared to drinking sucrose-sweetened beverages. This substitution works by modulating insulin secretion pathways rather than just reducing calorie intake.

Post-exercise intake of approximately 20g of protein reduces time below range (hypoglycemia) following moderate-intensity continuous training (MICT) in adults with Type 1 Diabetes.

If you have Type 1 Diabetes and do moderate continuous exercise (like jogging or cycling), eating about 20g of protein immediately after might help prevent low blood sugar overnight. This benefit was not seen with high-intensity interval training (HIIT). Always monitor your glucose and consult your care team before changing post-exercise nutrition.

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.

In non-diabetic patients, a ketogenic diet increases LDL cholesterol and total cholesterol compared to low-fat diets, whereas in diabetic patients, it improves lipid profiles by lowering triglycerides and raising HDL.

If you are non-diabetic and overweight, be aware that a ketogenic diet may raise your LDL and total cholesterol compared to a low-fat diet. If you have diabetes, a ketogenic diet tends to improve your triglycerides and HDL (good cholesterol). Monitor your lipids closely if you choose this diet.

Males with severe obesity experience significantly greater excess body weight loss and greater reduction in gamma-glutamyl transferase (a marker for NAFLD) compared to females following a 25-day very low-carbohydrate ketogenic diet (VLCKD).

If you are female, you may lose less weight and see less improvement in liver health markers than a male following the exact same very low-carb ketogenic diet protocol. This is likely due to differences in body fat distribution and hormones. Do not assume your results will match male benchmarks; focus on consistency and consult a professional to adjust expectations.

The sex-based difference in VLCKD efficacy is attenuated in post-menopausal females, who experience benefits more similar to males than pre-menopausal females.

If you are post-menopausal, your body's response to a very low-carb ketogenic diet may be more similar to a man's than to a pre-menopausal woman's. This is likely due to hormonal shifts. You may see better results than expected if you adjust your strategy to account for these changes rather than assuming you can't lose weight.

Intermittent energy restriction (IER) improves insulin sensitivity (reduces fasting insulin and HOMA-IR) in non-diabetic populations compared to continuous energy restriction (CER).

For non-diabetic individuals, IER may offer metabolic benefits beyond weight loss, specifically improving insulin sensitivity. This is achieved by lowering fasting insulin levels. If you have diabetes, consult a doctor to adjust medications before starting IER to prevent hypoglycemia.

Intermittent energy restriction (IER) improves intermediate disease markers, specifically triacylglycerols and systolic blood pressure, compared to a usual diet, but has no effect on LDL-cholesterol, fasting glucose, or HbA1c.

Beyond weight loss, IER can improve blood pressure and triglyceride levels. However, it does not significantly affect LDL cholesterol, fasting glucose, or HbA1c compared to a usual diet. If you have diabetes, consult a doctor as some studies reported hypoglycemia.

Alternate day fasting with a low-carbohydrate diet significantly reduces LDL cholesterol, systolic blood pressure, and fasting insulin in adults with obesity.

If you have high LDL, high blood pressure, or high fasting insulin, this specific combination of fasting and low-carb eating may help improve these markers. Monitor your levels with your doctor, as individual responses to low-carb diets on cholesterol can vary.

Early Time-Restricted Eating (eTRE) combined with calorie restriction is more effective for weight loss and fat mass reduction than delayed TRE (dTRE) or broader TRE windows.

If you can manage it, shifting your eating window to earlier in the day (eTRE) combined with a calorie deficit yields better weight and fat loss results than shifting it to later in the day (dTRE). However, if early eating is socially unsustainable, any consistent TRE window with a calorie deficit is still superior to no TRE.

Intermittent fasting during Ramadan significantly improves insulin sensitivity and reduces insulin resistance in healthy young men, independent of changes in fasting plasma glucose.

For healthy young men, observing Ramadan-style intermittent fasting (sunrise to sunset) for about a month can improve how your body handles insulin, even if your fasting blood sugar numbers don't change. This benefit comes from reduced insulin levels and weight loss, provided you maintain your usual activity level.

Intermittent fasting during Ramadan significantly reduces serum leptin levels in healthy young men, correlating with weight loss, while adiponectin levels remain largely unchanged.

Fasting for a month lowers your leptin levels, a hormone that signals energy stores to your brain. This drop correlates with your weight loss. Adiponectin, another metabolic hormone, stays relatively stable. This hormonal shift is part of the body's adaptation to reduced energy intake.

Early Time-Restricted Eating (eTRE) with an 8-hour window starting before noon significantly reduces body weight and fat mass while improving glycemic markers (fasting glucose, insulin, HOMA-IR) and triglycerides in young adults with delayed sleep-wake cycles, whereas late TRE (starting after noon) fails to produce these metabolic benefits.

If you are a young adult with a late sleep schedule, try shifting your eating window to start before noon (e.g., 8am-4pm or 9am-5pm) for 4 weeks. Ensure you get about 20g of extra protein daily (via snacks or shakes) to protect muscle. This specific timing appears necessary to reduce fat and improve blood sugar control; starting your window after noon may not yield these metabolic benefits.

A time-restricted eating protocol with a 16-hour fasting window (16:8) significantly reduces body mass and absolute fat mass in metabolically healthy, non-trained individuals, whereas 12-hour and 14-hour fasting windows do not produce significant changes.

If you are healthy and not trying to build muscle, try eating all your meals within an 8-hour window (e.g., 10am to 6pm) and fasting for the other 16 hours daily for 8 weeks. Do not try to restrict calories; just stick to the timing. You may lose fat mass without changing how much you eat, but 12-hour or 14-hour windows likely won't work for you.

Time-restricted eating (TRE) significantly improves cardiometabolic risk factors, specifically reducing insulin, total cholesterol, and LDL concentrations.

Focus on aligning your eating window with your circadian rhythm (e.g., 16:8). This may improve insulin sensitivity and lipid profiles independently of major weight loss, particularly if you have metabolic risk factors.

Combining continuous energy restriction (CER) with 16/8 time-restricted feeding (TRF) yields equivalent weight and fat loss to CER alone, but superior preservation of fat-free mass and skeletal muscle.

If you are trying to lose weight while keeping your muscle, adding an 8-hour eating window (like 12pm-8pm) to your calorie deficit won't make you lose fat faster than just eating fewer calories. However, it may help you keep more muscle mass. Focus on hitting your protein and calorie targets; the timing is a tool for adherence or muscle sparing, not a magic fat-loss multiplier.

CER alone increases cortisol levels, whereas CER combined with 16/8 TRF does not, suggesting TRF may mitigate the stress response to caloric restriction.

Caloric restriction can raise stress hormones like cortisol, which might hinder muscle retention. If you are doing a diet, adding an eating window might help keep these stress hormones lower than if you just restrict calories without timing constraints.