Browse the evidence

Polygenic scores derived from 59 SNPs associated with central adiposity predict a smaller reduction in waist circumference after one year of lifestyle intervention, though the effect size is too small to be clinically significant.

Your genes might make it slightly harder to lose belly fat compared to someone else with different genetics, but the difference is less than a centimeter. This is too small to matter for your health goals. Focus on the lifestyle intervention (diet and exercise) as it provides a much larger benefit than any genetic disadvantage.

Short-term (2-week) crossover metabolic ward trials without washout periods are invalid for determining chronic macronutrient effects on energy intake and body fat due to massive, differential carry-over effects from physiologic adaptation.

Do not rely on short-term (under 4-6 weeks) diet studies to predict long-term weight loss outcomes. The body's metabolic adaptation to macronutrient changes (like ketosis or insulin shifts) takes weeks to months. Short trials often measure transient adaptation rather than chronic effects, leading to misleading conclusions about which diet is superior for fat loss.

Accelerometer-derived summary metrics (MIMS-unit, AAI, MAD, ENMO) derived from raw data provide greater comparability across different device manufacturers and models than traditional proprietary activity counts.

If you are a researcher, stop relying on proprietary 'counts' to compare studies. Use open-source raw data algorithms (like MIMS-unit or AAI) to ensure your findings are comparable across different device brands. If you are a consumer, understand that 'steps' or 'activity scores' from different brands are not mathematically equivalent, even if they look similar.

Food industry donations to academic programs create conflicts of interest by influencing research design, minimizing criticism of harmful products, and shaping public policy, often without transparent disclosure of the donation's purpose.

When evaluating health or nutrition research funded by food companies, check for disclosed conflicts of interest. If a study is funded by an industry with a vested interest in the outcome (e.g., sugary drinks funding obesity research), scrutinize the study design and conclusions more heavily, as industry funding is correlated with outcomes favorable to the sponsor.

Deregulation of dietary supplement health claims, driven by political lobbying rather than scientific evidence, has led to a proliferation of unproven therapeutic claims and increased industry revenue without corresponding public health benefits.

Be skeptical of health claims on supplement labels that do not explicitly state 'This statement has not been evaluated by the Food and Drug Administration.' If a product claims to 'support' a bodily function (e.g., immune, joint, cardiovascular) without citing specific, significant scientific agreement, it likely lacks robust clinical evidence. Prioritize products with transparent sourcing and third-party testing, and consult a healthcare provider before using supplements to treat or prevent diseases, as the regulatory environment allows for marketing claims that may not reflect scientific reality.

Cardiac diastolic function, specifically the E/e' ratio and Left Atrial Volume Index (LAVI), significantly moderates the reduction in relative peak oxygen uptake in Type 2 Diabetes patients.

For T2D patients, standard cardiac checks might miss the root cause of exercise intolerance. If you struggle with exercise despite normal ejection fraction, ask about diastolic function (E/e' ratio). Addressing this through specific training (like high-intensity interval training, as suggested by the authors) may be more effective than generic advice.

Bariatric surgery, specifically Roux-en-Y gastric bypass (RYGB), is a highly effective treatment for severe obesity, providing rapid and durable weight loss, though it carries risks of adverse events and nutritional deficiencies.

For individuals with severe obesity (BMI >40 or >35 with comorbidities), bariatric surgery like RYGB is a highly effective, durable treatment. It is not a cosmetic procedure but a medical intervention for severe disease. Patients must be prepared for lifelong nutritional monitoring to prevent deficiencies.

Altering shoulder position (flexed vs. extended) during elbow flexion resistance training does not influence regional hypertrophy or maximum strength gains when resistance profiles are matched.

If you are doing biceps curls, it does not matter whether you sit on a preacher bench (shoulder flexed) or lie back on an incline bench (shoulder extended), as long as you are lifting heavy enough to fail around 8-12 reps. Both positions will build muscle and strength equally well. Do not waste time switching exercises to 'target' the long head; just pick one and focus on adding weight over time.

Total energy expenditure (TEE) and activity energy expenditure (AEE) exhibit greater male variability (GMV) that peaks in young adulthood and declines in old age, whereas basal energy expenditure (BEE) and standard morphometrics (height, fat-free mass) do not follow this specific life-course pattern.

Energy expenditure is not a fixed number but a variable trait that differs significantly between individuals, especially men during their reproductive years. This variability is driven by complex interactions of activity, muscle mass, and other traits, not just basal metabolic rate or height. For health planning, individualized assessment of energy needs is more critical than relying on population averages, particularly for young adult males.

There are significant research gaps regarding the effectiveness of nutritional interventions for underrepresented populations, specifically women, older adults, and Asian populations.

Be aware that most research on muscle hypertrophy interventions focuses on men and Western populations. If you are a woman, older adult, or from an Asian background, the optimal nutritional strategy may differ, and you should consult a professional for personalized guidance.

Obesity is a primary chronic disease driven largely by genetic predisposition, amplified by caloric intake and decreased energy expenditure, requiring recognition as a disease for proper insurance coverage and management.

Stop blaming yourself or your patients for obesity. It is a primary disease with strong genetic components. This recognition is the first step to getting proper insurance coverage and medical treatment, not just lifestyle advice.

Using external momentum (cheat repetitions) during single-joint upper body resistance training produces muscle hypertrophy equivalent to strict technique, despite generating significantly higher volume load.

If you are doing single-joint exercises like bicep curls or tricep pushdowns, you don't need to be rigid about 'strict' form to maximize muscle growth. Using 'cheat' reps (adding momentum) allows you to lift more total volume, which resulted in the same muscle growth as strict reps in this study. However, be cautious of joint stress, especially in your back and hips, as momentum can increase injury risk. Use this technique strategically, perhaps at the end of a set, rather than for every rep, to balance gains with safety.

In older adults, visceral fat levels significantly decrease over two years, while body weight, muscle mass, and total body fat percentage do not change significantly.

As you age, your visceral fat may naturally decrease even if your weight and muscle mass stay the same. This highlights the importance of monitoring visceral fat, not just weight.

Adhering to an anti-inflammatory diet (low Dietary Inflammatory Index) does not improve perceived stress or general health outcomes during caloric restriction in healthy, non-obese adults.

If you are restricting calories to lose weight, do not expect that focusing specifically on 'anti-inflammatory' foods will automatically lower your stress levels or improve your general health perception. The CALERIE trial shows that while CR itself may improve general health, the specific inflammatory potential of the diet (DII) does not drive these psychological benefits. Focus on sustainable caloric deficit rather than obsessing over anti-inflammatory metrics for mental health gains.

Genotype-based dietary interventions (low-carb vs. low-fat) do not significantly impact weight loss outcomes, suggesting that genotyping alone is not an effective precision medicine approach for weight loss.

Don't pay for expensive genetic testing to tell you whether to eat low-carb or low-fat. Current high-quality evidence shows that your genotype does not predict whether you will lose more weight on one diet versus the other. Focus on finding a dietary pattern you can adhere to consistently that creates a caloric deficit.

Sarcopenia is driven by anabolic resistance, mitochondrial dysfunction, and chronic inflammation, which decouple muscle mass from muscle function.

Understanding that muscle mass and function are different helps explain why you might look stronger but still feel weak. Treating the underlying inflammation and mitochondrial health is as important as building size.

Moderate alcohol consumption (up to 36 g/day) in type 2 diabetes patients is associated with reduced mortality and microvascular/macrovascular complications.

If you have type 2 diabetes, moderate alcohol intake (up to 36 grams per day) may actually lower your risk of heart problems and other complications. This contradicts the common advice to avoid alcohol completely. However, this does not mean you should start drinking if you don't already.

The coexistence of depression and type 2 diabetes is associated with a significantly higher risk of all-cause and cardiovascular disease (CVD) mortality compared to either condition alone, with the risk being particularly elevated in women with long-duration diabetes or those on insulin therapy.

If you have both diabetes and depression, your risk of dying from heart disease or other causes is significantly higher than if you had only one of these conditions. This risk is even higher if your diabetes has been present for 10+ years or if you require insulin. To mitigate this, it is crucial to actively treat both conditions. Treating depression is not just about mood; it is a critical component of reducing mortality risk in diabetic patients, likely by improving adherence to diabetes management and reducing biological stress responses.

Computed Tomography (CT) mean muscle attenuation (MA) is significantly correlated with intramyocellular lipid (IMCL) measured by Magnetic Resonance Spectroscopy (MRS) in the soleus muscle, validating CT as a reliable proxy for assessing intramuscular triglyceride stores.

For clinical or research purposes, CT scans can be used to estimate intramuscular fat levels by measuring muscle attenuation, providing a reliable alternative to more complex MRS techniques. This is particularly useful for assessing insulin resistance risk in sedentary, overweight, or obese populations.

Adherence to a Mediterranean diet supplemented with extra-virgin olive oil or nuts does not significantly reduce the incidence of heart failure compared to a low-fat control diet in high cardiovascular risk individuals, although point estimates suggest a potential benefit that requires larger trials to confirm.

For individuals at high cardiovascular risk, following a Mediterranean diet supplemented with olive oil or nuts did not statistically significantly reduce the risk of developing heart failure compared to a low-fat diet in this specific trial. However, the trend favored the Mediterranean diet, and the study may have been underpowered. It remains a heart-healthy dietary pattern for other cardiovascular benefits, but should not be relied upon as a guaranteed prevention method for heart failure based on this data alone.

The RECODe risk equations provide more accurate predictions for microvascular and cardiovascular complications in diverse U.S. populations with type 2 diabetes compared to older models like UKPDS OM2 and ACC/AHA PCEs, which tend to substantially overestimate risk.

For clinicians managing diverse type 2 diabetes patients, using the RECODe risk equations instead of older models (like UKPDS or ACC/AHA PCEs) leads to more accurate risk assessment. This accuracy helps avoid unnecessary aggressive treatments for patients at lower actual risk and ensures high-risk patients receive appropriate intensive care, thereby reducing drug-related morbidity and improving overall population health management.

Carbohydrate loading does not improve performance in 100-km stochastic cycling time trials when carbohydrate is ingested during exercise, likely because concurrent intake prevents hypoglycemia regardless of pre-exercise glycogen stores.

If you are eating carbohydrates during your long ride, you likely do not need to perform a strict carbohydrate loading protocol in the days leading up to it. Your performance will be similar whether you load or eat normally, provided you fuel during the event. Save the loading protocol for events where you cannot eat during the activity.

The timing of daily metabolic responses to nutritional challenges differs significantly between serum and skeletal muscle, with serum metabolites showing robust time-of-day oscillations that are reprogrammed by diet type, whereas skeletal muscle metabolome shows less time-of-day variation.

For metabolic health, the timing of your meals matters as much as what you eat. Serum metabolites show strong daily oscillations that are reprogrammed by diet type (high fat vs high carb). While muscle metabolome is less responsive to time-of-day, serum shows significant differences between morning and evening states. This suggests that aligning meal timing with circadian rhythms may be a lever for metabolic optimization, particularly for lipid metabolism in the blood.

In low-income countries (LIC), the excess cardiovascular and all-cause mortality associated with diabetes remains high and is not significantly attenuated by standard pharmacological treatments (antidiabetes, antihypertensive, lipid-lowering drugs, and aspirin), unlike in high-income countries where treatment substantially reduces this risk.

For patients in low-income settings, having a diabetes diagnosis carries a significantly higher mortality risk than in wealthy nations, and simply taking prescribed medications (for blood sugar, blood pressure, or cholesterol) does not fully mitigate this risk. This is due to systemic issues like low medication adherence, suboptimal dosing, lack of access to acute cardiac care (like angioplasty), and socioeconomic disparities. To reduce mortality, access to care must be improved beyond just medication availability, including affordable acute interventions and better disease management.