Browse the evidence

There is no minimal threshold for cognitive benefit from exercise; any amount of physical activity is better than none, though clinically meaningful changes require ~724 METs-min/week.

You do not need to exercise for hours to see brain benefits. Even small amounts of activity help. However, to see significant, clinically meaningful improvements, aim for approximately 724 METs-min per week (e.g., 150 minutes of moderate activity).

Obesity moderates the dose-response relationship for cognitive benefits, with overweight/obese older adults reaching maximal cognitive benefits at lower exercise doses (~600 METs-min/week) than those with healthy BMI.

If you are overweight or obese, you may achieve maximum cognitive benefits with around 600 METs-min of exercise per week. Pushing beyond this may not yield additional cognitive gains and could be unrealistic. Start with moderate doses.

Obesity causes a significant reduction in circulating adiponectin levels, which contributes to insulin resistance, metabolic syndrome, and increased cancer risk.

If you have excess body fat, your body naturally produces less of this protective hormone, which makes you more resistant to insulin and prone to inflammation. This is a biological feedback loop, not a character flaw. Addressing the underlying adiposity through sustainable lifestyle changes can help restore normal adiponectin levels and improve metabolic health.

Dietary intake of monounsaturated fatty acids (MUFAs), particularly from extra virgin olive oil, increases the Bacteroidetes/Firmicutes ratio and reduces obesity, insulin resistance, and inflammatory bowel disease in animal and human models.

Incorporate monounsaturated fats, especially from extra virgin olive oil, into your diet. This is linked to a healthier gut microbiome, reduced obesity, and lower risk of insulin resistance and inflammation in both animal and human studies.

Dietary intake of n-3 polyunsaturated fatty acids (PUFAs), such as EPA and DHA from fish oil, increases the Bacteroidetes/Firmicutes ratio and reduces obesity, insulin resistance, and inflammatory bowel disease, whereas n-6 PUFAs (like linoleic acid) may have the opposite effect.

Increase your intake of n-3 polyunsaturated fatty acids (found in fish oil, flaxseed, and canola oil) and balance your n-6 to n-3 ratio. This is linked to a healthier gut microbiome, reduced obesity, and lower risk of insulin resistance and inflammation in both animal and human studies. Limit excessive n-6 PUFA intake (found in corn and soybean oils).

High DHA fish oil supplementation (DHA > EPA) improves cardiovascular efficiency during submaximal exercise by lowering heart rate and improving heart rate variability, without negatively affecting endurance performance.

If you are looking to improve cardiovascular efficiency during moderate exercise, high DHA fish oil (where DHA exceeds EPA) may help lower your heart rate for a given workload. This does not necessarily make you faster (endurance performance was unaffected in some studies), but it may make exercise feel easier by reducing cardiac strain. Look for supplements with a DHA:EPA ratio greater than 1:1, dosed between 1-6g daily.

High DHA fish oil supplementation improves postprandial arterial stiffness and endothelial function, potentially reducing cardiovascular disease risk, whereas EPA alone may not provide the same postprandial benefit.

To support vascular health and reduce arterial stiffness after meals, choose a high DHA fish oil supplement (where DHA is higher than EPA). This may improve how your arteries handle the stress of a fatty meal. Standard fish oils with higher EPA may not offer this specific post-meal vascular benefit.

Higher overall diet quality, particularly adherence to Mediterranean-style dietary patterns, is associated with a lower risk of declines in physical performance (walking speed, mobility) in older adults.

For older adults, prioritizing overall diet quality—specifically patterns like the Mediterranean diet rich in vegetables, fruits, whole grains, fish, and olive oil—is strongly linked to maintaining physical mobility and walking speed. While the link to muscle mass is less clear, improving diet quality is a key strategy for preserving physical function and reducing the risk of mobility disability.

Consuming 1 cup (150g) of blueberries daily for 6 months improves endothelial function and reduces arterial stiffness in adults with metabolic syndrome, independent of changes in insulin resistance.

If you have metabolic syndrome, eating one cup of blueberries every day for six months can improve your blood vessel health and stiffness, which lowers cardiovascular risk. However, this amount of blueberries will not improve your insulin resistance or blood sugar control, so it should be part of a broader strategy that includes managing insulin sensitivity.

In statin non-users with metabolic syndrome, consuming 1 cup of blueberries daily for 6 months significantly increases HDL cholesterol, HDL particle number, and apolipoprotein A-I levels.

If you have metabolic syndrome and are not taking statins, eating one cup of blueberries daily for six months may improve your HDL cholesterol and particle numbers. This benefit was not observed in those taking statins, suggesting medication may interfere with this specific dietary effect.

All three exercise modes (RT, WBVT, and MT) significantly improve Timed Up and Go (TUG) times in older adults with sarcopenia, but none improve Chair Stand (CS) times.

Even if your ability to stand up from a chair (Chair Stand) doesn't improve, your ability to get up and walk (Timed Up and Go) will likely improve with any exercise regimen (RT, WBVT, or MT). This is a key functional benefit for fall prevention. Focus on consistency (1-5x/week) for at least 6 weeks.

Specific nutraceuticals (SAMe, omega-3, methylfolate, Vitamin D) show efficacy as adjunctive therapies for depression, while others (zinc, folic acid, vitamin C, tryptophan) have limited support.

If considering supplements for depression, focus on those with stronger evidence like SAMe, omega-3 (high EPA), methylfolate, and Vitamin D as adjuncts to standard care. Be skeptical of claims for zinc, vitamin C, or tryptophan as primary treatments.

Low muscle glycogen availability shifts fuel utilization towards increased lipid oxidation and reduced carbohydrate oxidation during exercise.

If you want to maximize fat oxidation during exercise, starting with low muscle glycogen (e.g., fasted or after a low-CHO meal) will shift your body to burn more fat. However, this comes at the cost of reduced carbohydrate oxidation and potentially lower performance intensity.

Sarcopenia in liver transplant candidates is defined by a Skeletal Muscle Index (SMI) <50 cm2/m2 in men and <39 cm2/m2 in women, measured via CT at L3, and is a strong predictor of adverse outcomes including mortality and complications.

If you have cirrhosis and are being evaluated for a liver transplant, ask your care team about getting a CT scan to measure your muscle mass (SMI). This is a standard part of the evaluation and helps predict your risk for complications. It is not just about how you look, but the actual muscle tissue measured at the L3 vertebra.

Adherence to the DASH dietary pattern is associated with a significantly lower risk of incident gout in men, independent of traditional risk factors.

For men at risk of gout, adopting a DASH-style diet—emphasizing fruits, vegetables, whole grains, and low-fat dairy while limiting red meat, sweets, and sodium—is associated with a significantly lower risk of developing gout. This approach is preferred over restrictive low-purine diets because it is more sustainable and also improves cardiovascular health.

Adherence to a Western dietary pattern is associated with a significantly increased risk of incident gout in men.

Men should limit their intake of red/processed meats, sugar-sweetened beverages, sweets, desserts, French fries, and refined grains, as this Western dietary pattern is associated with a higher risk of developing gout. Substituting these with fruits, vegetables, whole grains, and low-fat dairy can mitigate this risk.

Post-menopausal women exhibit 'anabolic resistance' to bone-loading exercise due to estrogen depletion, resulting in negligible increases in bone mass, although exercise can still preserve bone strength and mitigate loss.

If you are post-menopausal, do not expect exercise to significantly increase your bone density due to hormonal changes. However, continue weight-bearing and resistance exercise to maintain bone strength, improve balance, and reduce fracture risk. Focus on preservation and strength rather than mass gain.

Continuous Glucose Monitoring (CGM) metrics, specifically Time in Range (TIR) and Glycemic Variability (GV), provide superior clinical insight and safety compared to HbA1c alone by detecting hypoglycemia and glucose excursions that HbA1c misses.

If you have diabetes, rely on CGM data (Time in Range) alongside HbA1c. HbA1c tells you the average, but CGM shows the dangerous swings and lows that average numbers hide. Use this data to adjust diet and medication to stay in the 70-180 mg/dL range as much as possible.

Newer glucose-lowering agents (ultra-long-acting insulin analogs, SGLT2 inhibitors, GLP-1 RAs) reduce Glycemic Variability (GV) and hypoglycemia risk compared to older agents (e.g., insulin glargine 100U/mL) due to smoother pharmacodynamic profiles.

If you experience high glucose swings or frequent lows on older insulin, discuss switching to newer analogs (like Degludec or Glargine 300U) or adding SGLT2/GLP-1 agents with your doctor. These drugs are designed to work more smoothly, reducing dangerous lows and glucose spikes.

Glycemic Variability (GV), defined by a coefficient of variation (CV) >36%, is independently associated with an increased risk of hypoglycemia and diabetes-related complications, regardless of HbA1c levels.

Monitor your Glucose Coefficient of Variation (CV). If your CV is above 36%, your glucose is swinging too much, which increases complication risk. Work with your doctor to smooth out these swings using diet, exercise, or medication adjustments, even if your HbA1c looks okay.

Implementing a beverage excise tax on sugar-sweetened and artificially sweetened beverages significantly increases their retail price and substantially reduces their volume sales, although cross-border shopping partially offsets the reduction in the taxed jurisdiction.

If you are a policy maker, a beverage tax is an effective tool to reduce sugary drink consumption. Expect prices to rise, which drives the reduction in sales. Be aware that some consumers will shop across borders, so design the tax to minimize this leakage (e.g., regional coordination) or accept that a portion of the sales reduction will be offset by out-of-city purchases.

Dietary fiber interventions consistently increase Bifidobacterium spp. abundance in healthy adults, regardless of whether SCFA levels change significantly.

You can generally expect your gut bacteria to respond to fiber by increasing Bifidobacterium levels. However, this taxonomic shift does not guarantee a measurable increase in beneficial metabolites (SCFAs) in your blood or stool, as metabolic output varies by fiber type and individual microbiome.

Consumer wearable devices (specifically Apple Watch) can accurately predict sleep stages (Wake, NREM, REM) and sleep-wake status by combining raw acceleration, photoplethysmography (PPG) heart rate, and a circadian 'clock proxy' feature using neural network classifiers.

If you use a smartwatch (like an Apple Watch) to track sleep, you can trust its sleep-wake detection more than previously thought, especially if it uses heart rate data. However, do not rely on it for diagnosing sleep disorders. For research or personal optimization, combining movement with heart rate variability and circadian timing models provides a robust estimate of sleep stages, bridging the gap between consumer tech and clinical science.

Insomnia is a causal risk factor for type 2 diabetes, independent of BMI.

Prioritize treating insomnia as a medical risk factor for diabetes, not just a nuisance. If you have chronic sleep difficulties, address them with the same urgency as blood sugar management.