Browse the evidence

High HDD diets shift gut microbial community composition from fiber-degrading taxa (e.g., Prevotella) to mucin-degrading taxa (e.g., Bacteroides, Akkermansia) due to nutrient limitation.

If you eat a diet low in fiber and high in processed ingredients, your gut bacteria may shift to eat your gut lining (mucin) instead of your food. To encourage beneficial fiber-eating bacteria, increase your intake of whole plant foods.

Supplementation with marine long-chain n-3 polyunsaturated fatty acids (EPA and DHA) reduces cardiovascular risk in primary prevention and secondary prevention for patients with low baseline status and limited polypharmacy, but recent trials show null results in highly medicated secondary prevention populations.

Aim to eat fatty fish regularly to get EPA and DHA. If you are not eating fish, consider supplementation, especially if you have low baseline levels. However, if you are already on many heart medications, the added benefit of supplements may be minimal.

When resistance training is performed to volitional fatigue, muscle hypertrophy is independent of the external load used (high vs. low), provided volume load is matched or effort is equivalent.

You do not need to lift heavy weights to build muscle. If you use lighter weights (30-40% of your max), you must perform more reps (20-25) and push until you physically cannot complete another rep with good form. This effort-to-failure approach yields the same muscle growth as heavy lifting (70-80% max) done for fewer reps (8-12). Ensure you eat enough protein (at least 1.6g per kg of body weight) and train consistently 3 times a week.

Using lean body mass (LBM) and body fat percentage (BF) in reference equations for peak oxygen uptake (VO2peak) provides better calibration for overweight and obese individuals compared to equations based on total body mass.

If you are overweight or obese, standard fitness tests that use your total body weight to predict your maximum oxygen uptake (VO2peak) likely overestimate your fitness level. To get an accurate assessment of your cardiorespiratory health, especially if you are older, use reference equations that account for your lean body mass and body fat percentage. This prevents being falsely categorized as 'fit' when your actual functional capacity may be lower.

Electronic health record (EHR) data from the one-year period prior to initiating anti-obesity medication (AOM) contains sufficient multidimensional clinical signals to identify distinct obesity subtypes (clusters) with unique physiological profiles, enabling precision medicine approaches that outperform traditional BMI-based classifications.

If you are considering obesity medication, ask your doctor about 'deep phenotyping.' This means using your full medical history (labs, vitals, diagnoses) from the past year to group you into a specific 'obesity subtype.' This helps predict which medication will work best for you, rather than just using your BMI. It reduces the guesswork in choosing between different drugs like GLP-1 agonists or others.

Bariatric surgery (specifically Roux-en-Y gastric bypass, sleeve gastrectomy, and biliopancreatic diversion) provides superior long-term weight loss (average 27% over 15 years) and quality of life improvements compared to lifestyle interventions and pharmacotherapy, despite carrying higher risks of postoperative complications.

If you have a BMI over 40 (or over 35 with health issues) and lifestyle changes haven't worked, bariatric surgery is the most effective medical intervention for long-term weight loss. It involves physically altering your stomach and intestines to restrict food intake and/or absorption. While it carries surgical risks and requires lifelong vitamin monitoring, it offers the highest chance of significant, sustained weight loss and improved quality of life compared to drugs or diet alone.

Combination therapies (e.g., Phentermine/Topiramate, Naltrexone/Bupropion) offer superior weight loss compared to monotherapy by targeting multiple pathways (appetite suppression and calorie absorption/reward), but carry higher risks of adverse effects and require strict monitoring.

Combination drugs like Phentermine/Topiramate can achieve nearly 11% weight loss, significantly better than placebo. They work by suppressing appetite and altering brain signaling. However, they have more side effects (dry mouth, taste disturbance, insomnia) and require careful monitoring for cognitive and cardiovascular effects. They are reserved for patients who need more than single-agent therapy.

Protein supplementation during endurance training significantly improves time to exhaustion (TTE) with a moderate effect size, despite having no significant effect on maximal oxygen uptake (VO2max) or body composition in the general population.

If you are doing endurance training, adding protein supplements will likely help you exercise for a longer time before exhaustion. However, do not expect this to significantly change your body weight, body fat, or maximum oxygen capacity (VO2max) unless you are currently untrained. Focus on the performance duration benefit rather than body composition changes.

Untrained individuals may experience greater improvements in maximal oxygen uptake (VO2max) from protein supplementation during endurance training compared to trained individuals.

If you are new to endurance training, adding protein supplements might help slightly improve your maximum oxygen uptake (VO2max). This benefit is likely not present if you are already a trained endurance athlete.

For recreationally resistance-trained men, performing a split-body resistance training routine with 2 sessions per week per muscle group yields equivalent maximal strength and muscle hypertrophy gains compared to 3 sessions per week, provided total weekly volume is equated.

If you are an experienced lifter, you don't need to train every muscle 3 times a week to maximize gains. You can split your routine over 2 days per muscle group (e.g., 9 sets per muscle per session, twice a week) and get the same strength and muscle growth as training 3 times a week (6 sets per session), as long as you hit the same total weekly volume and train hard.

Higher genetically predicted relative carbohydrate and protein intake is causally associated with a reduced risk of atrial fibrillation.

Focus on increasing your intake of carbohydrates and proteins, but prioritize quality. Choose whole grains, fruits, and vegetables for carbs, and high-quality protein sources. This dietary pattern is associated with a lower risk of atrial fibrillation. Avoid excessive intake of low-quality proteins and ultra-processed foods, as these may increase cardiovascular risk.

Lengthened partial repetitions (LPs) elicit similar muscle hypertrophy and strength-endurance adaptations as full range of motion (fROM) resistance training in resistance-trained individuals.

If you are resistance-trained and want to maximize muscle growth or strength, you do not need to force full range of motion if it causes pain or technical breakdown. You can use lengthened partial reps (focusing on the stretched position at the bottom of the movement) to get the same benefits as full reps. Just ensure you are training to failure and pausing in the stretched position. This gives you flexibility to train around injuries or mobility limitations without sacrificing gains.

Dumbbell and cable lateral raises produce equivalent lateral deltoid hypertrophy when shoulder abduction/adduction range of motion is standardized and matched between conditions.

You can use either dumbbells or cables for lateral raises to build your side delts. The key is to match the range of motion (lifting your arm to about 90 degrees) and train to failure for 5 sets, twice a week. Don't worry about which machine is 'better' mechanically; just pick the one you prefer and stick with it.

High-intensity interval training (HIIT) engages a unique subset of skeletal muscle signaling pathways and substrates compared to work- and duration-matched moderate-intensity continuous training (MICT), specifically involving kinases like PKC alpha/beta and substrates like MTFP1, which are associated with plasma lactate levels.

To trigger unique muscle adaptations associated with high-intensity training, you don't need to exercise for hours. A short session of 5 minutes of high-intensity intervals (e.g., 1-minute sprints followed by 1-minute recovery, repeated 5 times) is sufficient to activate specific signaling pathways (like PKC and MTFP1) that are not significantly engaged by moderate, continuous exercise of the same total duration and workload. This suggests HIIT is a highly time-efficient strategy for stimulating metabolic and mitochondrial adaptations.

Front-of-pack labeling (FOPL) and sugar-sweetened beverage (SSB) taxes are cost-effective population-level primary prevention strategies that reduce consumption, though their effectiveness varies by socioeconomic status and literacy.

Support policies like sugar taxes and clear food labeling. These are proven to reduce sugary drink consumption and encourage companies to make healthier products. While they may not solve obesity alone, they are a cost-effective way to improve population health.

Bariatric surgery provides superior, durable weight loss and metabolic improvement compared to non-surgical interventions, including pharmacotherapy.

If you have severe obesity (BMI ≥40, or ≥35 with health issues) and lifestyle changes haven't worked, bariatric surgery is the most effective long-term solution for weight loss and metabolic health. While it has higher upfront costs and risks, it is more cost-effective over time than lifelong medication. Consult a specialist to see if you qualify.

Metformin, alpha-lipoic acid (ALA), and GLP-1 receptor agonists are effective, complementary pharmacological interventions for managing metabolic syndrome, with metformin serving as the universal first-line treatment due to its safety, low cost, and wide availability.

For patients with Metabolic Syndrome, especially in crisis or resource-limited settings, start with metformin as the primary treatment due to its proven safety, low cost, and wide availability. Add alpha-lipoic acid (ALA) to target oxidative stress and insulin sensitivity, and consider GLP-1 agonists if cardiovascular risk is high and resources allow. Simplify regimens and use telemedicine to support adherence, as stress and disruption are major barriers to care.

The MicroSimulation Core Obesity Model (MS-COM) accurately predicts cardiovascular and mortality outcomes in adults with overweight or obesity, including those with normoglycemia, prediabetes, or type 2 diabetes, supporting its use for evaluating obesity management interventions.

For policymakers and health technology assessment bodies, the MS-COM model provides a reliable tool to evaluate the cost-effectiveness of obesity interventions (like semaglutide 2.4 mg) by accurately predicting long-term cardiovascular and mortality risks in overweight and obese adults, including those with diabetes.

Bariatric surgery (gastric banding, bypass, sleeve gastrectomy) results in large weight loss, induces remission of type-2 diabetes and hypertension, and increases life expectancy.

For severe obesity where other methods fail, bariatric surgery is a highly effective option that can lead to significant weight loss and remission of conditions like diabetes and high blood pressure. It can also increase life expectancy and be cost-effective over the long term, provided resources are available.

Preoperative Total Abdominal Fat Area (TAFA) is an independent predictor of excellent weight loss outcomes following laparoscopic sleeve gastrectomy, with lower TAFA predicting higher likelihood of achieving >75% excess weight loss and >30% total weight loss.

If you are considering sleeve gastrectomy, ask your surgeon about measuring your abdominal fat area (via CT or MRI) before surgery. A lower abdominal fat area is associated with a significantly higher chance of achieving excellent weight loss results. This metric offers more predictive power than BMI alone.

Tirzepatide treatment for obesity is associated with a very low incidence of macronutrient malnutrition and vitamin deficiency adverse events, with fewer than 1% of patients discontinuing treatment due to nutritional status concerns.

If you are taking tirzepatide for obesity, the risk of developing serious nutritional deficiencies or malnutrition is very low, especially if you follow the recommended dietary counseling. The study showed that fewer than 1% of patients had adverse events related to malnutrition. To stay healthy, focus on the recommended diet (high protein, balanced macros) and attend your lifestyle counseling sessions.

Resistance training-induced skeletal muscle hypertrophy is associated with the differential regulation of 110 non-coding RNA (ncRNA) genes, which mediate growth via specific cell types including leukocytes, satellite cells, and pericytes.

This research confirms that muscle growth is not just about mechanical tension but involves complex genetic regulation via non-coding RNAs. For the average lifter, this means individual genetic variability plays a huge role in response to training (only 61% were 'responders' in this study). While there is no direct intervention yet, this highlights that 'non-responders' may have different molecular profiles, suggesting future personalized training or nutritional strategies could be based on these biomarkers.

Achieving optimal control of multiple risk factors (lifestyle and metabolic) in type 2 diabetes can restore life expectancy to levels comparable to individuals without diabetes.

If you have type 2 diabetes, focus on controlling your risk factors (blood sugar, blood pressure, lipids, smoking, diet, and exercise). Doing so can add 6-9 years to your life compared to poor management and may even bring your life expectancy in line with someone who doesn't have diabetes.

A healthy lifestyle can compensate for suboptimal metabolic control to provide longevity benefits in type 2 diabetes.

Even if your blood sugar or other metabolic numbers aren't perfect, maintaining a healthy lifestyle (not smoking, regular exercise, healthy diet) can still add 1.5-3.4 years to your life compared to someone who has perfect numbers but an unhealthy lifestyle.