Browse the evidence

Chronic low-grade inflammation (inflammaging) acts as a bidirectional driver that exacerbates all other hallmarks of aging, creating a vicious cycle that accelerates biological aging and age-related diseases.

Chronic, low-grade inflammation is a central accelerator of aging. While not an intervention itself, understanding 'inflammaging' highlights the importance of lifestyle factors (diet, exercise) that modulate immune response and reduce this persistent inflammatory state, thereby potentially slowing the progression of age-related diseases.

Dual-energy X-ray absorptiometry (DXA) is the preferred criterion measure for body composition assessment because it provides a multi-compartment model including bone mineral content, offering higher accuracy than two-compartment methods.

If you have access to DXA, use it for the most accurate baseline of bone, fat, and muscle. However, recognize that other methods like BIA or skinfolds are valid for tracking changes over time if DXA is not accessible.

Computed tomography (CT) assessment of muscle mass and myosteatosis lacks standardization across studies, with significant variation in anatomic landmarks, thresholding values, and reporting of technical parameters like contrast use and slice thickness.

When interpreting or conducting CT-based muscle assessments, ensure strict adherence to standardized protocols regarding anatomic landmarks (e.g., L3), thresholding values, and reporting of technical parameters (contrast, slice thickness). Lack of standardization currently limits the ability to compare results across studies or clinics.

Weight-loss and bodybuilding supplements, particularly those containing ephedra, DMAA, or adulterated with unlisted drugs (e.g., anabolic steroids, fluoxetine), carry a significant risk of severe adverse events including liver failure, cardiovascular collapse, and death.

Avoid weight-loss supplements containing ephedra, DMAA, or unlisted ingredients. Bodybuilding supplements are frequently adulterated with steroids or other drugs. If you experience liver symptoms (jaundice, fatigue) or cardiovascular issues (palpitations, chest pain) after taking these, stop immediately and seek medical help. The risk of severe injury or death is real.

Across all populations, antihypertensive medications achieve greater systolic blood pressure (SBP) reductions than structured exercise interventions, with a mean difference of -3.96 mmHg.

Structured exercise lowers blood pressure, but not as much as medication. If you have hypertension, do not rely on exercise alone to manage it; consult your doctor about medication. Exercise is a valuable adjunct, but medication provides a stronger effect.

Genetic factors account for 30-60% of the variance in cardiorespiratory fitness response to exercise training in humans.

Your genetic makeup determines a significant portion of how much your fitness will improve with exercise. This is not a failure of willpower. If one type of exercise doesn't work, try others, as genetic response to specific modalities may vary.

Current tobacco smoking modifies genetic susceptibility to obesity traits, specifically increasing genetic variance explained for overall adiposity (BMI) while attenuating genetic effects on body fat distribution (waist-to-hip ratio).

If you smoke, your genetic risk for gaining overall weight (BMI) may be higher than if you didn't smoke, but your genetic risk for storing fat around your waist (body shape) may be lower. Quitting smoking might change how your genes express themselves regarding weight distribution. This highlights that lifestyle choices like smoking can interact with your DNA to influence your body composition.

Epigenetic aging, as measured by the Skin&blood clock, is distinct from cellular senescence, telomere attrition, and genomic instability, but is associated with nutrient sensing, mitochondrial activity, and stem cell composition.

Epigenetic age is not a simple proxy for cellular damage or telomere length. Interventions that extend lifespan (like caloric restriction or rapamycin) slow epigenetic aging, while those that extend lifespan via other mechanisms (like NAD precursors or metformin in this specific context) may not. To influence epigenetic age, focus on nutrient sensing (mTOR pathway) and mitochondrial health, as these are mechanistically linked to the clock's ticking, distinct from DNA repair or telomere maintenance.

Bariatric surgery induces significant lean body mass (LBM), fat-free mass (FFM), and skeletal muscle mass (SMM) loss, with approximately 55% of LBM loss occurring within the first 3 months post-surgery.

If you undergo bariatric surgery, expect to lose about 8 kg of lean body mass within the first year, with more than half of that loss happening in the first 3 months. This is not just fat loss; it includes muscle. To protect your metabolism and function, you must prioritize protein intake and resistance training immediately after surgery, not just focus on calorie restriction.

Consumer-grade wearable devices are not exempt from rigorous performance evaluation simply because they are marketed as 'research' or 'clinical' grade, as proprietary algorithms and hardware inconsistencies can still lead to significant errors.

Do not assume a device is accurate because it is 'clinical grade' or 'FDA cleared'. You must validate the specific device's sleep staging accuracy against PSG for your specific study population before using it for research conclusions.

When total training volume is equated, increasing resistance training frequency per muscle group (from 1 to 3+ days/week) does not significantly or meaningfully increase muscle hypertrophy.

If you want to maximize muscle growth, focus on getting your total weekly sets in. How you split those sets across the week (1 day vs. 3 days) does not matter for hypertrophy, provided the total volume is the same. You can train each muscle group once a week or multiple times a week; choose the schedule that allows you to recover well and stick to your program.

Lower socioeconomic status (higher Townsend Deprivation Index) significantly amplifies the genetic effect on BMI.

For those with high genetic risk for obesity, socioeconomic factors like deprivation can amplify the genetic effect on BMI. Addressing socioeconomic barriers may be as important as lifestyle changes in mitigating genetic risk.

Accurate dietary assessment using Food Frequency Questionnaires (FFQs) is insufficient for studying diet-microbiome relationships because they lack the specificity to link specific foods to microbial changes.

Most large-scale diet studies use simple questionnaires that may not accurately reflect what you ate. For microbiome research, these methods are often too vague to find specific links between foods and bacteria. More detailed food records are needed for accurate results.

The unilateral exercise model (training one limb while keeping the contralateral limb as a control) significantly increases statistical power and reduces study costs compared to parallel-group or standard crossover designs by eliminating inter-subject variability and the need for washout periods.

For researchers, using a unilateral exercise model (training one limb while keeping the other as a control) is a highly efficient way to study muscle adaptations. It allows you to use fewer participants, reduces costs (fewer biopsies, less food provision), and eliminates the need for long washout periods between treatments, provided you are studying biochemical or histological outcomes rather than systemic or neuromuscular strength transfers.

Current food environment policies in Vietnam are insufficient, with 74% of assessed indicators scoring low or very low, particularly in food composition standards, marketing, and labeling.

Policymakers must move beyond food safety regulations to address nutritional quality. This requires implementing mandatory food composition standards (e.g., sugar/salt/trans-fat limits), restricting marketing of unhealthy foods (especially to children), and enforcing front-of-package labeling.

SGLT2 inhibitors significantly reduce the risk of hospitalization for heart failure and cardiovascular death in patients with type 2 diabetes, regardless of baseline glycemic control or heart failure status.

If you have Type 2 Diabetes and Heart Failure (or high risk for it), ask your doctor about SGLT2 inhibitors (like Jardiance or Farxiga). These drugs have strong evidence for reducing hospitalizations for heart failure and cardiovascular death, independent of their blood sugar-lowering effects. They are now a standard part of heart failure treatment guidelines.

Bariatric surgery remains the most effective long-term treatment for severe obesity, offering superior durability and comorbidity remission compared to pharmacotherapy.

For severe obesity, surgery is still the most durable and effective option for long-term health improvement. It offers better comorbidity remission than drugs alone. Consider it if your BMI is very high or you have serious health issues.

Roux-en-Y Gastric Bypass (RYGB) and Sleeve Gastrectomy (SG) are highly effective surgical interventions for severe obesity, with RYGB showing slightly greater long-term weight loss.

Surgical options like RYGB and SG are highly effective for severe obesity, leading to 47-55% excess weight loss over seven years. RYGB tends to result in slightly greater weight loss than SG, but both improve quality of life. These are major surgeries requiring careful patient selection and postoperative management.

Fasting is defined as voluntary abstinence from some or all foods or beverages for preventive, therapeutic, religious, cultural, or other reasons, distinguishing it from starvation which is involuntary and pathological.

To fast, you voluntarily abstain from food and/or beverages for a specific period. This is distinct from starvation, which is involuntary and harmful. Your motivation (health, religion, culture) defines the context, but the core action is voluntary abstinence.

Absolute variance statistics (SDir, lnVR) are insufficient for detecting true interindividual response variation because they are confounded by mean-variance relationships (where higher means lead to higher variances); the Log Ratio of Coefficient of Variation (lnCVR) is required to isolate true response heterogeneity.

When evaluating resistance training results, do not assume that a wider range of outcomes (some people growing a lot, some a little) is solely due to individual 'trainability.' It may simply be that those who grew more had higher starting strengths, which naturally scale with greater variance. To truly understand why some people don't respond, you must look at relative variation (coefficient of variation) rather than absolute changes. For the individual, this means that 'average' program prescriptions will inevitably fail some people, not because the program is bad, but because biological scaling laws dictate that larger gains come with larger variance.

2'-FL supplementation does NOT significantly alter the Cytokine Response Score (CRS), a marker of immune aging, in older adults, despite increasing Bifidobacterium.

Taking 2'-FL (1g or 5g daily) for 6 weeks did not improve the Cytokine Response Score, a marker of immune aging, in older adults. However, it did increase Bifidobacterium and HDL cholesterol. Users should not expect this to reverse immune aging markers based on this study.

Daily supplementation with 2000 IU of vitamin D or 1 g of marine n-3 fatty acids does not reduce the risk of major cardiovascular events, invasive cancer, or secondary outcomes in adults.

Do not take Vitamin D or Fish Oil supplements expecting them to prevent heart disease or cancer. Large studies show they do not work for this purpose at standard doses.

Intensive lifestyle intervention (ILI) does not significantly reduce the risk of major cardiovascular events (mortality, myocardial infarction, stroke) in adults with overweight/obesity and type 2 diabetes compared to standard diabetes support and education.

Even if lifestyle changes do not significantly lower your risk of heart attacks or death from cardiovascular causes, they still provide major benefits for your diabetes control, kidney health, and daily quality of life. The effort is still worthwhile for these other critical health improvements.

Data on dietary intakes for infants, young children, school-age children, older adults, and pregnant/lactating women is significantly sparse, with less than one-third of surveys including this information.

Recognize that dietary data for vulnerable populations (infants, children, older adults, pregnant/lactating women) is often missing. This limits our ability to assess their specific dietary needs and health risks accurately.