Browse the evidence

Gene-based and microbiome-based personalized nutrition recommendations currently lack sufficient scientific evidence to improve weight loss outcomes compared to standard dietary counseling.

Do not pay for commercial genetic or microbiome tests to guide your weight loss diet. Current evidence shows they do not improve weight loss outcomes compared to standard dietary advice. Focus on creating a caloric deficit instead.

Post-obese individuals who have successfully lost weight exhibit significantly lower plasma leptin concentrations and lower rates of fat oxidation (higher respiratory quotient) compared to never-obese controls matched for body mass index and body fat percentage.

If you have lost weight and maintained it, your body may still be biologically primed to regain it through lower fat burning and lower leptin levels, even if you look healthy. This is a common biological adaptation, not a failure. To counter this, focus on strategies that increase fat oxidation, such as regular exercise and potentially adjusting fat intake, as suggested by the authors.

Oral administration of 30 mg deuterated creatine (D3-creatine) allows for the estimation of total body skeletal muscle mass via urine D3-creatinine enrichment, providing estimates that correlate strongly with MRI but exhibit high intraindividual variability compared to MRI or DXA.

This study validates a method to measure muscle mass using a specific labeled creatine tracer and urine analysis. It is not a supplement regimen for building muscle, but a diagnostic tool. For now, it remains a research method due to cost and complexity, though it aims to eventually replace expensive imaging like MRI for tracking muscle wasting in clinical settings.

Soy protein intake does not significantly impact total cholesterol, LDL cholesterol, or triglycerides in individuals with familial hypercholesterolemia.

Increasing soy protein intake is not an effective strategy for lowering cholesterol in patients with Familial Hypercholesterolemia. The evidence shows no significant benefit for LDL or triglycerides compared to standard diets.

Mitochondria-targeted antioxidants (e.g., MitoQ, SkQ1) and polyphenols (e.g., Resveratrol) can extend lifespan and improve health in animal models by reducing ROS damage and mimicking caloric restriction effects, but human clinical efficacy is unproven and dosage is critical.

While mitochondria-targeted antioxidants and polyphenols show promise in animals, human evidence is mixed. Do not rely on supplements to replace exercise or healthy eating. If considering supplements like Resveratrol or MitoQ, be aware of poor bioavailability and lack of proven lifespan benefits in humans. Focus on whole-food sources of polyphenols.

Obesity (BMI ≥ 30 kg/m2) is associated with approximately 20% greater greenhouse gas (GHG) emissions compared to a normal-weight state (BMI < 25 kg/m2), contributing an estimated 700 megatons of CO2 equivalent annually globally.

Obesity contributes significantly to global greenhouse gas emissions (approx. 1.6% globally) through increased metabolism, food production, and transportation needs. Addressing obesity is not just a health priority but an environmental one. However, this information should never be used to stigmatize individuals; obesity is driven by powerful environmental factors, and solutions require systemic policy changes rather than individual blame.

Genetic variability in the GLP1R gene can lead to non-response to GLP-1 receptor agonists in some patients with T2DM and obesity.

Some patients with T2DM and obesity do not respond well to GLP-1 receptor agonists due to genetic factors. If you are not seeing results, genetic variability in the GLP-1 receptor might be a cause. Discuss this with your healthcare provider to explore other treatment options or lifestyle interventions.

A decrease in the dietary protein fraction (dilution by carbs/fat) triggers compensatory energy intake via protein leverage, potentially explaining a significant portion of the US obesity epidemic.

Ensure your diet has a sufficient proportion of protein relative to total calories. If you are eating a diet high in carbs and fats, you may need to eat more total food to get enough protein, which can lead to weight gain. Prioritize protein density to avoid this compensatory overeating.

GLP-1 receptor agonists delay gastric emptying and increase the risk of pulmonary aspiration during general anesthesia, necessitating specific peri-operative management strategies.

If you take a GLP-1 drug (like Ozempic, Wegovy, or Trulicity) and have surgery, tell your anesthesiologist. You likely need to stop the drug for a specific time before surgery (often 3 half-lives, e.g., 1 week for weekly drugs) to prevent stomach contents from entering your lungs while asleep. Do not assume standard fasting rules apply; your stomach may still be full even if you haven't eaten for 12 hours.

Provider mindfulness increases patient-centered communication and patient satisfaction.

For patients, choosing a provider who values mindfulness may lead to better communication. For providers, practicing mindfulness (e.g., meditation) can improve empathy and patient satisfaction.

Among overweight and obese adults, there is no statistically significant interaction between insulin resistance status and weight loss outcomes when comparing low-fat and low-carbohydrate diets, provided both diets emphasize high nutritional quality and macronutrient differentiation.

If you are overweight or obese, focusing on high-quality foods (minimally processed, nutrient-dense) and reducing either fat or carbohydrates to a low level can lead to substantial weight loss. Your insulin resistance status does not appear to determine which of these two approaches works better for you. Choose the diet you can adhere to long-term, ensuring it is nutritionally dense.

Formerly morbidly obese women exhibit significantly depressed lipid oxidation (increased carbohydrate reliance) during submaximal exercise compared to weight-matched controls, a defect that persists despite weight stability and may predispose individuals to obesity.

If you have lost significant weight after morbid obesity, your body may still burn less fat during exercise than someone who was never obese, even if you are now the same weight. This means you might feel like you are working harder to burn fat during physical activity. To manage weight, you may need to be mindful of this metabolic difference, potentially focusing on consistent physical activity and dietary strategies that account for a lower reliance on fat oxidation during exercise.

Evidence that behavioral weight management programs reduce the incidence of cardiovascular disease or type 2 diabetes is currently sparse and uncertain.

While BWMPs improve risk factors, do not expect them to definitively prevent heart disease or diabetes based on current evidence. The data is too sparse to draw firm conclusions about disease incidence reduction.

Semaglutide improves insulin sensitivity and glucose uptake in skeletal muscle and adipose tissue by activating the PI3K/AKT and AMPK/SIRT1 pathways, leading to GLUT4 translocation, independent of direct insulin action in some contexts.

Semaglutide helps your body use insulin better by activating specific cellular pathways (AMPK/SIRT1) that move glucose into muscles and fat cells. This reduces insulin resistance, a key factor in type 2 diabetes and obesity.

The obesity epidemic is primarily driven by an obesogenic environment—specifically the increased availability of highly processed, calorie-dense foods and reduced occupational physical activity—acting on genetically susceptible individuals, rather than by genetics alone.

Focus on modifying your environment rather than relying solely on willpower. Reduce access to highly processed, calorie-dense foods and increase incidental physical activity (e.g., walking, standing) to counteract the sedentary nature of modern work and food availability.

Secondary environmental factors—including poor sleep hygiene, decreased cigarette smoking, increased atmospheric CO2, thermoneutrality, screen time, endocrine-disrupting chemicals, medications, and an unhealthy microbiome—contribute to the obesity epidemic by tipping the energy balance equation.

Consider secondary factors like sleep quality and exposure to endocrine disruptors. While food and activity are primary, improving sleep hygiene and reducing unnecessary medication/chemical exposure may support weight management.

Weight loss-induced metabolic adaptation is defined as a decrease in thermogenesis greater than predicted by changes in body weight and composition, primarily driven by enhanced energy efficiency (e.g., reduced ATP synthesis oxygen need) and neuroendocrine shifts rather than just organ size reduction.

If you are losing weight and hitting a plateau, recognize that your body is likely adapting by becoming more energy-efficient (burning fewer calories for the same tasks) due to hormonal changes and reduced sympathetic tone. This is a normal survival mechanism, not a sign that your diet is failing. To overcome this, you may need to adjust your caloric deficit or increase physical activity, understanding that the rate of loss will naturally slow down.

Coffee consumption (caffeinated and decaffeinated) is inversely associated with liver fibrosis, abnormal liver function tests, and hepatocellular carcinoma risk in NAFLD patients.

If you tolerate it, drinking coffee (caffeinated or decaf) may help protect your liver from scarring and cancer. It is a simple, low-cost addition to a liver-healthy lifestyle.

HMB supplementation provides minor, inconsistent support for increasing or retaining lean soft-tissue mass (LSTM) in older or clinical populations, but has no evidence of improving physical function.

If you are older or clinically frail, HMB might offer a small benefit for retaining lean mass, especially if you are not exercising. However, do not expect it to improve your strength or physical function. It is not a substitute for exercise or adequate protein intake. If you are healthy and exercising, HMB likely adds no value.

Cold acclimation increases cold-induced thermogenesis (CIT) but does not increase diet-induced thermogenesis (DIT) or the thermic effect of food (TEF), indicating that CIT and DIT are regulated by distinct mechanisms.

Exposing yourself to cold (like 48°C for 20 mins daily) can train your body to generate more heat when it's cold, but it won't help you burn more calories from the food you eat. Don't expect cold therapy to boost your digestion or offset overeating.

Transdermal TRT has a minimal or inconsistent effect on reducing fat mass (FM) in men with spinal cord injury, unlike its consistent effect on increasing lean body mass.

While testosterone therapy will likely help you build muscle, don't expect it to automatically melt away fat if you have a spinal cord injury. Your reduced mobility and lower energy expenditure make fat loss harder to achieve through hormones alone. You may need to focus more on dietary adjustments and any possible physical activity to see changes in fat mass, even as your muscle mass improves.

Liraglutide attenuates nicotine-induced dopamine release in the nucleus accumbens (NAc), potentially reducing the addictive properties of nicotine while maintaining weight loss benefits.

GLP-1 drugs might reduce the 'high' or addictive feeling associated with nicotine, which could make it easier for smokers to quit or use nicotine-based therapies without the usual addiction risks.

Nutritional interventions, including supplements, do not provide additional benefit to mobility outcomes when combined with physical activity in older adults.

Do not rely on nutritional supplements to improve mobility. Focus on physical activity instead, as supplements have shown no additional benefit when combined with exercise for this population.

Brown adipose tissue (BAT) activation and the 'browning' of white adipose tissue (WAT) represent a potential therapeutic avenue for increasing energy expenditure and reducing body weight, although its clinical relevance in humans remains debated.

You can potentially increase your energy expenditure by activating brown fat, but this is not a guaranteed or standalone solution for weight loss. Strategies like cold exposure and sustained physical activity may promote 'browning' of white fat, turning it into heat-producing tissue. However, since its clinical impact is still debated, focus on these as complementary tools to a balanced diet and regular exercise, not replacements.