Browse the evidence

Hypoglossal nerve stimulation (HNS) produces substantial, durable improvements in AHI and symptoms with high adherence, supported by randomized trials and real-world data.

If you have moderate-to-severe sleep apnea and cannot tolerate CPAP, ask about hypoglossal nerve stimulation (HNS). It is an implanted device that stimulates the tongue to keep the airway open, offering substantial and durable relief for the right candidate.

After adjusting for fat-free mass, fat mass, visceral fat, age, and physical activity, African-American young adults have a significantly lower resting metabolic rate (RMR) than white young adults, with a mean difference of approximately 80 kcal/day.

This research indicates that African-American individuals may have a slightly lower resting metabolic rate than their White counterparts, even when accounting for body size and composition. However, this difference (approx. 80 kcal/day) is small and does not appear to be the main driver of obesity disparities, especially since African-American men in the study did not have higher obesity rates despite having lower RMR. Focus on consistent physical activity and balanced nutrition rather than assuming metabolic inevitability.

Omega-3 fatty acids (EPA/DHA) exert antiarrhythmic effects by incorporating into cardiomyocyte membranes and modulating ion channel function.

Consuming omega-3s (from fish or supplements) helps stabilize heart rhythm by changing heart cell membranes. This is a key reason why omega-3s are recommended for heart health.

Military operational factors including deployments, restricted food choices, and limited physical exercise opportunities significantly contribute to the development and maintenance of obesity among service members.

If you are in the military, especially in the Navy or on deployment, your environment is designed to promote weight gain through limited fresh food and exercise options. Focus on what you can control within those constraints, such as seeking out fresh food when possible and maximizing movement opportunities, while advocating for better food and exercise access at the unit level.

High energy expenditure during combat training and field exercises, often exceeding 4000-7000 kcal/day, combined with limited energy intake, leads to Relative Energy Deficiency in Sport (RED-S) syndrome, causing detrimental health and performance outcomes.

During intense training or deployment, your body may burn 4000-7000+ calories. If you don't eat enough to match this, you risk RED-S, which harms your hormones, bones, and immune system. Prioritize eating enough to cover your energy expenditure to maintain long-term health and performance.

Caloric restriction and time-restricted feeding can extend healthspan and lifespan in animal models and improve metabolic health in humans, sometimes without weight loss, by reshaping molecular pathways in adipose tissue and aligning with circadian rhythms.

Try time-restricted feeding or caloric restriction without focusing solely on weight loss. Align your eating window with your circadian rhythm (e.g., eat earlier in the day) to maximize metabolic benefits and potentially extend healthspan, even if your weight doesn't change.

Overweight and obese individuals experience a greater suppression of energy intake and more pronounced weight loss from increased fiber intake compared to lean individuals.

If you are overweight, increasing your fiber intake is likely to be more effective for weight loss than if you are lean. You can expect a larger weight loss benefit (approx. 2.4 kg) compared to lean individuals (approx. 0.8 kg) when adding 14g of fiber daily.

Both diet-only and diet-plus-exercise interventions are associated with partial weight regain, indicating that neither strategy alone prevents long-term regain.

Expect some weight regain after losing weight, regardless of whether you exercised or not. This is a normal physiological response. To maximize long-term success, focus on strategies that limit this regain, as even the best current interventions (diet + exercise) only result in partial maintenance.

Maintaining intermittent restriction on just 1 day per week is sufficient to sustain the improvements in insulin resistance and body weight achieved during a 3-month intensive IECR phase.

After losing weight with a 2-days-a-week restriction plan, you can switch to just 1 restricted day per week to keep the weight off. On that one day, keep calories and carbs very low. On the other 6 days, eat a balanced, maintenance-level diet. This 'weekend warrior' approach helps maintain your health gains without the burden of daily dieting.

Very-low-calorie diets (VLCD, 400-800 kcal/d) under medical supervision produce approximately 20 kg of weight loss in 12-16 weeks, but long-term maintenance is poor without additional behavioral or exercise interventions.

VLCDs (400-800 kcal) can produce rapid weight loss (~20kg in 3-4 months) but require medical supervision. They are not a standalone long-term solution; combining them with behavior therapy or exercise significantly improves the chance of keeping the weight off.

Very-low-calorie diets (VLCDs, ~420 kcal/day) produce significantly greater short-term weight loss (approx. 21 kg) compared to moderate caloric restriction (1,200 kcal/day, approx. 12 kg) over 26 weeks, but this advantage is entirely lost by 78 weeks due to rapid weight regain in the VLCD group.

While a very low-calorie diet (around 400-500 calories) will help you drop weight much faster than a standard 1,200-calorie diet in the first 4 months, it does not help you keep it off. In fact, people on the extreme diet regained most of their weight by the end of the year, ending up with less net loss than those who lost weight more slowly. Focus on a sustainable deficit and maintenance strategies rather than extreme speed.

MCT consumption increases postprandial energy expenditure and fat oxidation in the short term (2 days), but this effect diminishes after 28 days of continuous consumption.

You might notice a slight boost in calorie burning when you first start using MCT oil, but this effect fades after a few weeks. Don't rely on it for long-term weight management. It's a minor tool, not a primary strategy.

Very Low-Calorie Diets (VLCDs) defined as ≤800 kcal/day with high-biologic-value protein produce significantly greater short-term weight loss (1.5-2.5 kg/week) compared to standard low-calorie diets (LCDs, 1200 kcal/day), but long-term weight maintenance is poor and not superior to LCDs when behavioral therapy is included.

If you are severely obese (BMI >30) and have failed standard diets, a VLCD (≤800 kcal/day) with high protein can help you lose weight much faster (approx. 20kg in 12-16 weeks) than a standard 1200 kcal diet. However, you must combine this with behavioral therapy and exercise, as VLCDs alone do not prevent weight regain long-term. This must be done under medical supervision to manage risks like gallstones.

In nonobese middle-aged adults, achieving equivalent fat loss through either calorie restriction or exercise yields similar improvements in major coronary heart disease risk factors, including LDL-cholesterol, insulin resistance, and inflammation.

If you are overweight but not obese, you can improve your heart disease risk by either eating 20% less or exercising enough to burn 20% more calories daily. The key is losing fat; it doesn't matter much which method you use to get there, as long as you achieve the fat loss.

Intensive weight loss interventions (behavioral programs, pharmacotherapy, or surgery) significantly improve biomarkers of nonalcoholic fatty liver disease (NAFLD), including liver enzymes (ALT, AST), steatosis, and disease activity scores, but do not significantly reverse histologic liver fibrosis in the short-to-medium term.

If you have NAFLD, intensive weight loss is the most effective way to improve liver health markers like enzymes and fat content. Focus on programs that achieve significant weight loss (via diet, exercise, medication, or surgery) rather than just changing diet composition without losing weight. Be aware that while liver fat and inflammation improve, existing scarring (fibrosis) may not reverse in the short term (6 months), so consistency is key.

Ramadan fasting induces a transient reduction in body weight and fat mass in healthy non-athlete adults, with effects being more pronounced in individuals with overweight or obesity and reversing within 2-5 weeks post-fast.

If you fast during Ramadan, expect to lose about 1.3 kg of weight and some fat by the end of the month, especially if you are overweight. This loss is not permanent; you will likely regain the weight within a month after fasting ends. To maintain any fat loss, you must manage your eating habits during the non-fasting hours (iftar/suhoor) to avoid overcompensating.

Intensive caloric restriction (330 kcal/day) rapidly and significantly lowers fasting plasma glucose in obese NIDDM patients, with maximal glycemic improvement occurring within 10 days, largely independent of the total amount of weight lost.

For obese individuals with type 2 diabetes, rapidly lowering carbohydrate and total caloric intake can normalize blood sugar levels much faster than weight loss itself. This suggests that the metabolic benefit comes from reducing the liver's glucose production and improving insulin sensitivity, not just from losing fat mass. Medical supervision is required for such extreme restriction.

Isocaloric refeeding after a Very Low Caloric Diet maintains significantly lower fasting plasma glucose levels compared to pre-diet baselines, even after discontinuation of antidiabetic medications, although glucose levels rise from the nadir achieved during the diet.

Even after stopping a strict low-calorie diet and returning to normal eating, people with type 2 diabetes often maintain better blood sugar control than they had before starting the diet. This suggests that a period of intensive dietary intervention can have long-lasting metabolic benefits, even if weight regain occurs.

Very-low-calorie diets (VLCDs, 400-800 kcal/d) produce significantly greater initial weight loss than low-calorie diets (LCDs, 800-1200 kcal/d), but long-term weight maintenance success is determined by active follow-up (behavioral therapy, nutrition education, exercise) rather than the initial diet intensity.

To use a VLCD effectively, do not just rely on the low calories. You must pair the 400-800 kcal diet with active behavioral therapy, nutritional education, and exercise. This combination is what leads to sustained weight loss, whereas VLCD alone often fails long-term.

Islamic fasting during Ramadan results in a statistically significant but small average weight loss (approx. 1.24 kg) during the fasting month, which is almost entirely regained within weeks after Ramadan ends, resulting in negligible long-term weight change.

If you are observing Ramadan, expect to lose about 1-1.5 kg during the month, but do not rely on this for long-term weight management. The weight will likely return after Eid unless you actively maintain the dietary and activity habits you formed during the fast. Focus on maintaining the reduced meal frequency and healthy food choices post-Ramadan to make the weight loss stick.

Physical exercise alone produces modest weight loss (approx. 2 kg) but significantly improves obesity-associated risk factors and abdominal fat, and is critical for long-term weight maintenance.

Aim for at least 150 minutes of moderate-to-high intensity exercise per week (e.g., brisk walking, cycling). While this will only result in about 2-3 kg of weight loss on its own, it is essential for improving your health risks and keeping the weight off after you lose it through diet.

Sibutramine (10-30 mg/day) significantly reduces daily energy and macronutrient intake in non-dieting women with obesity, primarily by reducing lunch and dinner consumption without affecting breakfast.

For women with obesity who are not actively dieting, taking Sibutramine (10-30mg) leads to a significant, automatic reduction in daily calorie intake, specifically at lunch and dinner, without requiring conscious effort to restrict food. This suggests the drug alters satiety signals or food selection behaviors rather than just willpower.

Aerobic exercise is required to reduce visceral adipose tissue (VAT) in postmenopausal women with type 2 diabetes, as a hypocaloric high monounsaturated fat diet alone fails to reduce this specific fat depot despite reducing total abdominal and subcutaneous fat.

If you have type 2 diabetes and are postmenopausal, simply cutting calories may not be enough to shrink your dangerous visceral belly fat. You must incorporate aerobic exercise (like brisk walking) at moderate intensity (65-70% of your max heart rate) for about 50 minutes, three times a week. This specific type of activity is required to target visceral fat, which is strongly linked to insulin resistance, even if your total body weight doesn't change drastically.

Women may experience a complete resolution of adaptive thermogenesis once weight stability is achieved, whereas men may retain a lower-than-predicted REE even after weight stabilization.

After you stop dieting and maintain your new weight, your metabolism might recover fully, especially for women. Men might continue to burn slightly less energy than predicted for their size even after stabilization, potentially making weight maintenance harder for them long-term.