Browse the evidence

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.

Tobacco smoking and high blood pressure are the leading preventable causes of death in the US, responsible for approximately 467,000 and 395,000 deaths respectively in 2005.

Focus on controlling blood pressure and avoiding tobacco as the highest-impact actions for longevity. These two factors alone account for roughly 20% of all adult deaths in the US, surpassing the combined impact of most dietary risks.

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.

Integrative computational modeling is required to understand the multiscale physiological responses to nutrition, bridging the gap between molecular mechanisms and whole-body metabolic syndrome outcomes.

To truly understand how diet affects health, especially for conditions like obesity and metabolic syndrome, we must move beyond simple statistics and use computational models that integrate data from genes to whole-body physiology. This approach allows us to predict how specific nutrients interact with biological systems over time.

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.

High dietary fiber intake does not reduce the risk of colorectal cancer or adenoma in women.

For women, increasing dietary fiber intake is unlikely to lower your risk of colorectal cancer or adenomas, despite common advice. This study suggests that other factors may be more critical for prevention.

Consuming raw garlic or commercial garlic supplements (powdered or aged extract) at standard-to-high doses for 6 months does not produce statistically or clinically significant reductions in LDL-C or other plasma lipid concentrations in adults with moderate hypercholesterolemia.

If you have moderately high cholesterol, eating garlic or taking garlic supplements (raw, powdered, or aged extract) at typical doses will not significantly lower your LDL cholesterol. While garlic is a healthy food with other potential benefits, do not rely on it as a primary treatment for high cholesterol. Focus on proven lifestyle changes and medications if prescribed by your doctor.

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.

Supplementation with 3g/day of HMB (calcium or free acid) does not significantly enhance fat-free mass or strength gains in young adults undergoing resistance exercise training compared to placebo.

If you are a young adult (under 45) doing resistance training, taking 3g of HMB daily will not give you more muscle or strength than training alone. Save your money.

Supplements such as chromium, zinc, vitamin D, vitamin E, cinnamon, and fenugreek are not recommended by the ADA for routine use in T2DM due to lack of significant effect on HbA1c.

Do not rely on supplements like chromium, cinnamon, or fenugreek to control your blood sugar. The American Diabetes Association recommends against their routine use because they do not significantly improve HbA1c levels. Focus on a balanced diet instead.

Intensive lifestyle intervention (caloric restriction, meal replacements, and physical activity) fails to reduce the incidence of major cardiovascular events in overweight or obese individuals with type 2 diabetes, despite achieving significant long-term weight loss and improvements in cardiovascular risk factors.

For individuals with type 2 diabetes, intensive lifestyle changes (diet, exercise, behavioral support) are still recommended because they improve weight, fitness, and other risk factors (like blood pressure and blood sugar), even if they do not directly reduce the risk of heart attacks or strokes. Focus on the overall health benefits rather than just cardiovascular event reduction.

Federal dietary guidelines that recommend reducing intake of meat, dairy, and processed foods face systematic political pressure and lobbying from food industry producers, resulting in diluted, ambiguous, or industry-favorable language in official policy documents.

Understand that when federal guidelines seem to contradict previous advice or seem vague (e.g., 'moderation'), it often reflects political compromise with food industries rather than a change in nutritional science. Stick to the consistent core principles: prioritize fruits, vegetables, and grains, and limit high-fat meats and processed foods, regardless of the specific wording of the current edition.

There is a significant disconnect between mechanistic research (e.g., mTOR signaling) and applied intervention studies, leading to a lack of systematic translation of basic science into concrete intervention strategies.

Current research often fails to bridge the gap between molecular science and practical advice. For now, focus on the proven basics: consistent resistance training and adequate protein intake, rather than trying to optimize based on complex molecular mechanisms that haven't been fully translated into practical protocols.

Most other interventions for medical conditions and health-risk behaviors in SMI populations have low or insufficient strength of evidence.

While metformin, behavioral interventions, bupropion, and varenicline have strong evidence, most other interventions for medical conditions and health-risk behaviors in SMI populations lack sufficient evidence. Future research should focus on long-term interventions and implementation strategies.

Commercial direct-to-consumer (DTC) genetic tests for personalized nutrition often lack scientific backing, provide insufficient result descriptions, and draw inferences that are not supported by robust evidence, particularly when based on single gene variants.

Be skeptical of DTC genetic nutrition tests. They are largely unregulated and often base advice on single genes, ignoring the complex polygenic nature of health. The paper states these tests often lack scientific backing. Use them for curiosity, not as a substitute for evidence-based dietary guidelines.

There is currently insufficient evidence to determine the specific impact of obesity on central blood pressure and its modification after bariatric surgery, as no studies have evaluated 24-hour central BP changes at medium or long term post-surgery.

While bariatric surgery lowers peripheral blood pressure, we do not yet know how it affects central (aortic) blood pressure over the long term. Future research is needed to understand if central BP improves as much as peripheral BP after surgery.