Browse the evidence

Sustainable, high-quality weight loss requires combining appetite suppression with moderate increases in energy expenditure and preservation of lean mass, rather than focusing solely on absolute weight reduction.

To lose weight sustainably, do not just focus on eating less. Prioritize strategies that protect your muscle mass (like resistance training and adequate protein) and support your metabolism. Modern treatments should ideally combine appetite control with mechanisms that prevent metabolic slowdown. The goal is to lose fat while keeping your lean tissue, which helps you maintain the weight loss long-term.

Intermittent fasting (IF) regimens improve body composition and cardiometabolic risk factors compared to unrestricted eating, primarily through energy deficit, but do not provide additional benefits over continuous daily caloric restriction when energy balance is matched.

Intermittent fasting works for weight loss and heart health because it helps you eat fewer calories, not because of some magic metabolic switch. If you eat the same amount of calories as someone who eats continuously, you won't get extra benefits from fasting. Use IF if it helps you stick to your calorie goals more easily.

The magnitude of systolic blood pressure reduction with GLP-1 RAs is directly associated with changes in body weight, BMI, and HbA1c, suggesting these metabolic improvements drive the BP benefit.

The blood pressure lowering effect of GLP-1s like semaglutide is largely driven by the weight loss and metabolic improvements (lower A1c/BMI) they cause, rather than a direct effect on blood vessels alone.

Non-beverage energy density and hyper-palatability (high sodium/fat or sodium/carb combinations) in ultra-processed foods positively predict meal energy intake and drive excess consumption.

Be aware that ultra-processed foods are engineered to be hyper-palatable and have high energy density (excluding beverages). This combination drives you to eat more without you necessarily feeling fuller. Choose foods with lower energy density and less engineered hyper-palatability.

Lifestyle modification, specifically caloric restriction and specific diets (e.g., Mediterranean, low-carbohydrate), reduces body weight and improves insulin resistance and hepatic steatosis, but its efficacy is moderate and less sustainable than GLP-1RA.

Losing just 5% of your body weight through caloric restriction can significantly improve insulin sensitivity and reduce liver fat by up to 40%. While lifestyle changes are the foundation of treatment, they often result in moderate weight loss compared to medications like GLP-1RA. Combining caloric reduction with exercise is effective, but maintaining this long-term is challenging, which is why pharmacological support is often needed for significant, sustained results.

Lifestyle interventions (diet and physical activity) improve cardiometabolic risk through mechanisms independent of weight loss, primarily by reducing visceral and ectopic fat and improving metabolic markers.

Do not focus on the scale. Focus on improving diet quality and increasing physical activity. These actions will reduce visceral fat and improve metabolic markers (blood pressure, lipids, glucose) even if your total weight doesn't change much. This is the most effective way to reduce cardiovascular risk.

A ketogenic diet tends to cause greater losses in body weight, fat mass, and fat-free mass compared to higher-carbohydrate diets, likely due to differences in calorie and protein intake and fluid shifts rather than the diet itself being inherently superior for fat loss.

If you want to lose fat, a ketogenic diet can help you lose weight, but it is not inherently better than other diets. The greater weight loss seen is likely due to eating fewer calories and losing water weight. Ensure you are consuming enough protein to preserve muscle mass, regardless of the diet you choose.

Gut microbiota composition determines individual variability in postprandial glycemic responses to standardized meals, enabling prediction of glucose spikes via machine learning models trained on metagenomic data.

Your gut bacteria uniquely determine how your blood sugar reacts to food. This is why one person might spike after a meal while another doesn't. Personalized nutrition strategies based on your microbiome can help manage glucose levels more effectively than generic advice.

GLP-1 receptor agonists (semaglutide) significantly improve quality of life and exercise capacity in obese patients with heart failure with preserved ejection fraction (HFpEF), primarily through substantial weight loss.

For obese patients with HFpEF, GLP-1 agonists like semaglutide are effective at improving quality of life and exercise capacity, largely by driving significant weight loss (approx. 13%). While these drugs are promising, their benefits appear closely tied to weight reduction rather than unique cardiac mechanisms. Therefore, they should be viewed as one option among others, including caloric restriction and supervised exercise, which may offer similar benefits at a lower long-term cost.

Achieved weight loss, rather than dietary protein quantity or red meat inclusion, is the primary driver of improved glucose control and body composition in adults with type 2 diabetes.

If you have Type 2 Diabetes, focus on losing weight rather than obsessing over whether your protein intake is 'high' or if you eat beef. This study shows that losing weight improves your blood sugar and body composition regardless of whether you eat a high-protein diet with beef or a normal-protein diet without it. Choose a dietary pattern you can stick to that creates a calorie deficit, and the health benefits will follow.

Adding exercise to a low-carbohydrate diet improves cardiorespiratory fitness (VO2peak) and reduces systolic blood pressure, but does not provide additional weight loss benefits compared to the low-carbohydrate diet alone.

If you are doing a low-carb diet, adding exercise won't necessarily make you lose weight faster than the diet alone. However, it will significantly improve your heart health, blood pressure, and mental well-being. Do exercise for these health benefits, not just for extra weight loss.

Self-reported dietary intake methods (Remote Food Photography Method) significantly underestimate energy intake compared to doubly labelled water (DLW) derived estimates, leading to an overestimation of the prevalence of Low Energy Availability (LEA) in female soccer players.

If you are a female soccer player or coach using food photography or logs to track energy availability, be aware that you are likely under-reporting intake by about 22%. This means you might think you have Low Energy Availability (a risk factor for injury and hormonal issues) when you actually don't. Do not make drastic dietary changes based solely on self-reported data without considering this potential under-reporting bias.

A decrease in total energy intake is independently associated with a loss of muscle mass in patients with Type 2 Diabetes, even when adjusting for physical activity and hypoglycemic agents.

When reducing calories for Type 2 Diabetes, be aware that muscle mass may also decrease. To counteract this, ensure your diet includes adequate protein and incorporate resistance training. Monitoring body composition is important to ensure you are losing fat, not muscle.

Metabolic adaptation during weight loss involves a 15-20% reduction in daily energy expenditure beyond what is expected from mass loss, which persists until the previous weight is regained.

When you lose weight through dieting, your body burns 15-20% fewer calories than expected for your new size. This 'metabolic adaptation' does not go away over time; it stays until you regain the weight. This is why maintaining weight loss through diet alone is so difficult—you must eat significantly less than a healthy person of your new weight would.

Long-term caloric restriction (25% reduction for 24 months) induces metabolic adaptation (adaptive thermogenesis) in sleeping energy expenditure that exceeds predictions based on changes in body mass alone, with the effect persisting at 24 months when assessed using advanced MRI-derived organ and tissue mass models.

If you restrict calories by 25% for two years, your body will adapt by lowering its energy expenditure more than expected from weight loss alone. This 'metabolic adaptation' is real and persists, especially when looking at organ-level changes. To manage this, focus on preserving muscle mass through resistance training and protein intake, as the study shows lean tissue loss is part of the equation, though not the whole story of metabolic slowdown.

While fat-free mass gains are similar, 16:8 TRE results in less fat mass accumulation and lower total training volume compared to continuous feeding during a caloric surplus.

Be aware that if you switch to an 8-hour eating window, you might naturally train for less total volume and accumulate slightly less fat than if you ate all day, even in a surplus. This isn't necessarily bad—it might mean you are more efficient with your energy—but it is a trade-off to consider if your goal is maximum fat gain (bulking).

Obesity increases perioperative morbidity and technical complexity in gastrointestinal cancer surgery, including higher rates of anastomotic leak and surgical site infection.

If you are obese and undergoing gastrointestinal cancer surgery, discuss the increased risk of complications with your surgeon. Preoperative weight loss may be recommended to reduce these risks.

Sustained weight loss of at least 5% achieved through pharmacotherapy or bariatric surgery is associated with a reduced risk of obesity-related cancers.

To reduce cancer risk, weight loss must be sustained over the long term. Losing at least 5% of body weight and keeping it off is associated with lower cancer risk. For those who struggle to maintain weight loss, pharmacotherapy or bariatric surgery can help sustain the loss, thereby preserving the cancer-protective benefits.

Orlistat, a lipase inhibitor, promotes modest weight loss (approx. 2-3 kg over 24 weeks) by blocking the absorption of dietary fat, but is associated with gastrointestinal side effects and potential fat-soluble vitamin deficiencies.

Orlistat is an older weight loss drug that works by blocking fat absorption. It leads to modest weight loss (around 2 kg over 6 months) and requires taking a capsule with each meal. Common side effects include oily stools and abdominal pain, which can be managed by keeping dietary fat low. You should also take a multivitamin at a different time of day to avoid nutrient deficiencies.

Very-low-carbohydrate diets enhance human T-cell immunity by inducing ketone body production (specifically beta-hydroxybutyrate), which reprograms T-cells to favor oxidative metabolism, improves cellular energy supply, and increases T memory cell formation.

If you reduce carbohydrate intake significantly, your body produces ketones like beta-hydroxybutyrate. This shift can reprogram your T-cells to use energy more efficiently via oxidative metabolism, potentially enhancing their ability to form long-term memory and respond to pathogens.

Weight loss mitigates the metabolic risk associated with high refined grain and carbohydrate intake, whereas weight gain exacerbates it.

If you are gaining weight, reducing refined grains is crucial to lowering metabolic syndrome risk. If you are losing weight, keeping refined grains below the median intake further reduces risk. Weight management modulates the impact of grain quality.

Following behavioral weight loss, the body enters a physiological state characterized by adaptive thermogenesis (declines in energy expenditure beyond those attributable to changes in body composition) and increased energy intake, which drive weight regain.

After losing weight, your body biologically fights to regain it by lowering your energy expenditure and increasing hunger. This is a normal physiological response, not a personal failure. To maintain weight loss, you must account for these biological changes, likely requiring ongoing behavioral support and potentially adjusted energy intake/expenditure strategies, rather than relying on the same intensity of effort used during the weight loss phase.

Using different prediction equations (Katch-McArdle vs. BIA-derived) to estimate Resting Metabolic Rate (RMR) during weight loss yields significantly different conclusions regarding the presence of metabolic adaptation (MA), with Katch-McArdle suggesting increased metabolic efficiency (increased aRMR) while BIA suggests decreased efficiency (decreased aRMR).

When tracking weight loss, do not rely on a single prediction equation to judge your metabolic health. This study shows that different formulas can contradict each other regarding metabolic adaptation. To minimize this error, prioritize preserving fat-free mass (muscle) through adequate protein intake (approx. 2.0 g/kg FFM as used in the study) and resistance training, as this stabilizes the metabolic rate more reliably than any single calculation method.

Intragastric balloons (IGB) are effective for weight loss but carry risks of dehydration, readmission, and reintervention, with saline-filled balloons outperforming air-filled ones.

If lifestyle changes haven't worked, an intragastric balloon can be a helpful bridge. Choose a saline-filled balloon over an air-filled one for better results. Be prepared for a 6-12 month commitment and take prescribed stomach acid reducers to prevent discomfort. The risk of serious complications is low, but dehydration is a common side effect.