Browse the evidence

The vascular benefits of exercise, specifically eNOS upregulation, are transient and depend on baseline activity levels; sedentary individuals see significant gains, while active individuals see minimal changes.

If you are already active, you likely have optimal vascular health; focus on consistency. If you are sedentary, starting exercise will yield significant vascular improvements.

Exercise-induced vascular remodeling (angiogenesis and arteriogenesis) improves organ blood flow and can compensate for occluded arteries, particularly in patients with cardiovascular disease.

Regular exercise helps grow new blood vessels and enlarge existing ones, improving blood flow to organs and helping the body compensate for blocked arteries.

Vitamin D3 supplementation significantly reduces cancer mortality by 16%, whereas Vitamin D2 does not show this benefit.

If you take Vitamin D for cancer prevention, ensure you are taking Vitamin D3, not D2. This review found a 16% reduction in cancer death risk with D3, but no such benefit with D2. D3 is also more effective at raising blood levels of Vitamin D.

Maternal dietary supplementation with methyl donors (folate, choline, vitamin B12) can prevent or reverse epigenetic modifications caused by low-protein or obesogenic diets in offspring, normalizing gene expression related to metabolism.

Pregnant women should ensure adequate intake of folate, choline, and B12, either through diet or supplements, especially if their diet is restricted or high in fat. This supports proper epigenetic programming for the child.

Obesity is a primary multifactorial disease (adiposopathy) driven by pathological adipose tissue dysfunction, not merely excess weight, and requires diagnosis based on body fat percentage and metabolic risk rather than BMI alone.

Stop using BMI as your sole health metric. If you have a normal BMI but feel unwell or have metabolic issues, ask for a body composition analysis (like DXA or BIA) to check your actual body fat percentage and visceral fat. Recognizing obesity as a disease (adiposopathy) helps access proper medical care rather than just diet advice.

Normal Weight Obesity (NWO) is a distinct phenotype characterized by normal BMI but high body fat percentage (>30% women, >25% men) and low lean mass, carrying significant cardiovascular and metabolic risk.

If you are normal weight, don't assume you are healthy. Get a body composition test. If you have high body fat and low muscle (NWO), you are at risk for diabetes and heart disease. Focus on building muscle and reducing visceral fat through resistance training and protein intake.

Higher intake of low-fat dairy products is inversely associated with the risk of incident hypertension in middle-aged and older women, whereas high-fat dairy intake shows no significant association.

If you are a middle-aged or older woman, increasing your intake of low-fat dairy products (like skim milk, low-fat yogurt, or cottage cheese) is associated with a lower risk of developing high blood pressure. Focus on getting calcium and vitamin D from food sources rather than supplements, as the study found no benefit from supplements alone.

Long-term supplemental intakes of combined EPA and DHA up to 5 g/day do not increase the risk of spontaneous bleeding episodes or bleeding complications, even in subjects at high risk of bleeding.

If you are taking high-dose fish oil (up to 5g/day combined EPA/DHA), you do not need to worry about an increased risk of bleeding, even if you are on blood thinners like aspirin or warfarin. This safety profile holds for long-term use in adults.

Supplemental intakes of EPA and DHA combined at doses of 2-6 g/day, and DHA at 2-4 g/day, increase LDL-cholesterol by about 3%, but this increase is accompanied by a decrease in triglycerides and does not adversely affect cardiovascular disease risk.

If you take 2-6g/day of combined EPA/DHA, your LDL cholesterol may rise by about 3%. However, this is offset by a drop in triglycerides, and your total cholesterol remains unchanged. Overall, this does not increase your cardiovascular disease risk.

Oral contraceptives (OCs) that maintain stable, moderate estrogen levels reduce the cyclic fluctuation in knee laxity and are associated with a lower risk of ACL injury compared to women with natural menstrual cycles.

If you are a female athlete concerned about ACL injuries, using oral contraceptives may help stabilize your ligament laxity throughout the month, potentially lowering your risk of injury compared to having natural hormonal cycles. Consult your doctor to see if this is appropriate for you.

Estrogen replacement therapy (ERT) in postmenopausal women improves muscle mass, strength, and power, and enhances the sensitivity of muscle to anabolic stimuli from exercise.

If you are postmenopausal and struggling to maintain muscle strength, talk to your doctor about Estrogen Replacement Therapy (ERT). It can help your muscles respond better to exercise, leading to greater gains in strength and power than exercise alone.

Daily intake of 1-3 grams of n-3 omega fatty acids (EPA/DHA) reduces cardiovascular risk by lowering serum triglycerides and LDL cholesterol, and inhibiting platelet aggregation.

To support heart health, aim for 1-3 grams of EPA/DHA daily, preferably through fatty fish or high-quality supplements. This dosage has been shown to lower triglycerides and LDL cholesterol. If you have existing heart conditions, consult a doctor, as high doses may interact with medications.

Experimental sleep restriction (4.5 hours/night for 4 nights) impairs insulin signaling in human subcutaneous adipocytes, reducing cellular insulin sensitivity by approximately 30% and shifting the dose-response curve to higher insulin concentrations.

Getting only 4.5 hours of sleep for just four nights significantly impairs how your fat cells respond to insulin, even if you are young and lean. This molecular change reduces your body's ability to manage glucose and lipids efficiently, contributing to insulin resistance. Prioritizing 7-9 hours of sleep is a critical, non-negotiable component of metabolic health, independent of diet or exercise.

Acute moderate-intensity exercise performed in a fed state increases postprandial levels of satiety hormones (PYY, GLP-1, PP) and suppresses hunger during the exercise period, resulting in a net negative energy balance despite higher absolute food intake.

If you exercise moderately after eating, you will likely feel less hungry during the workout. Even if you eat a bit more at your next meal, the energy you burned means you are in a net deficit. Don't fear the post-workout meal; the hormonal response helps regulate it.

Exposure to artificial light at night (ALAN), particularly blue-shifted light from LEDs and screens, disrupts circadian rhythms and is associated with increased risk of mood disorders, including depression and anxiety, through direct neural pathways and indirect hormonal/sleep disruptions.

To protect your mood and mental health, minimize exposure to bright, blue-rich light (LEDs, screens) in the hours before bed. Use dim, warm-colored lights (red/orange) if you must use electronics, and consider blue-light-blocking glasses if you work night shifts. Prioritize darkness during sleep to support natural melatonin production and circadian alignment.

Magnesium supplementation (approx. 300-486 mg/day) can lower blood pressure and C-reactive protein (CRP) in specific clinical populations, such as those with hypertension or heart failure.

If you have hypertension or heart failure, discuss magnesium supplementation with your doctor. Studies suggest doses around 300-486 mg/day may help lower blood pressure and inflammation, but this is not effective for people with normal blood pressure.

Systematic vitamin D food fortification is an effective and cost-effective public health strategy to improve population-level vitamin D status and reduce deficiency, overcoming the limitations of individual supplementation and sunlight exposure.

If you live in a region with limited sun or eat few fatty fish, look for vitamin D-fortified foods like milk, margarine, or orange juice. This is a safe, passive way to maintain healthy vitamin D levels without needing to remember daily supplements. Check local guidelines for what foods are typically fortified in your country.

High-dose iron supplementation in aqueous solution reduces zinc absorption and status, particularly in infants and pregnant women, whereas solid-food fortification shows no such interaction.

If you are taking high-dose iron supplements, be aware they might lower your zinc levels, especially if you are pregnant or an infant. However, if you get your iron from fortified foods, this interaction is less likely to occur. Consider getting minerals from food sources when possible to avoid these competitive absorption issues.

Ascorbic acid (Vitamin C) significantly improves iron absorption and status, particularly in populations with plant-based diets or iron deficiency, though it may impair copper absorption at high doses.

If you are vegetarian or have low iron, adding Vitamin C to your meals or taking a moderate supplement (200mg) can significantly boost your iron levels. However, if you eat a lot of meat, extra Vitamin C might not help your iron much and could potentially lower copper levels if taken in very high doses long-term.

Marine omega-3 fatty acids (EPA and DHA) reduce the risk of cardiovascular disease, particularly coronary heart disease and sudden cardiac death, primarily through secondary prevention in high-risk patients (e.g., post-myocardial infarction), while evidence for primary prevention in healthy populations remains weak or inconclusive.

If you have heart disease or have had a heart attack, taking 840mg of EPA+DHA daily is a well-supported strategy to reduce mortality. If you are healthy and have no heart disease, taking omega-3 supplements is unlikely to prevent a heart attack, though it may offer other minor benefits. Focus on diet (fatty fish) rather than supplements for primary prevention.

Sarcopenia is associated with an increased risk of cardiovascular-specific mortality in females, but not in males.

For older women, sarcopenia is a specific warning sign for heart-related death. If you are a woman with low muscle mass and slow walking speed, you should be particularly vigilant about your cardiovascular health, as your risk is significantly higher than men with the same condition.

High serum uric acid levels are independently associated with an increased risk of developing type 2 diabetes, with a dose-response relationship showing a 6% increased risk per 1 mg/dl increment.

If you are middle-aged or older, having high uric acid is a warning sign for type 2 diabetes risk, independent of your weight or blood pressure. While this paper doesn't prescribe a specific treatment, it suggests that monitoring and potentially managing uric acid levels (through diet or medication as advised by a doctor) could be part of a strategy to prevent diabetes.

Selenium intake and status are suboptimal across Europe and the Middle East, with Eastern Europe and specific UK demographics showing the most significant deficits.

Selenium status is likely suboptimal in many Western and Eastern European populations, as well as parts of the Middle East. Because soil selenium varies, food databases are poor predictors of individual status. Consider testing serum selenium or selenoprotein P if you are in a low-selenium region, and ensure your diet includes selenium-rich sources like Brazil nuts, seafood, or meat, as plant-based sources vary wildly in content.

Optimal selenium status for maximizing glutathione peroxidase (GPx) expression requires serum or plasma selenium concentrations between 90–100 μg/L.

To maximize the activity of glutathione peroxidase, an antioxidant enzyme, aim for a serum selenium level of 90–100 μg/L. This is a specific biomarker target that may require supplementation if your diet is low in selenium.