Browse the evidence

Current anti-obesity medication (AOM) studies frequently misrepresent skeletal muscle mass (SMM) loss by using DXA or BIA to estimate fat-free mass (FFM) or lean mass, which includes bone and non-skeletal tissues, thereby confounding the assessment of clinically significant muscle loss.

When reading studies on weight loss drugs (like GLP-1 agonists) that report 'muscle loss' based on DXA or bioimpedance scales, recognize that these numbers likely overestimate true skeletal muscle loss because they include bone and water. True muscle loss is likely lower than reported in these specific studies. Look for studies using MRI or CT for accurate skeletal muscle quantification.

Post-exercise consumption of 25g collagen hydrolysate or dairy protein does not improve indices of exercise-induced muscle damage (EIMD) or accelerate recovery compared to an isoenergetic placebo in recreationally active males.

If you are doing intense eccentric exercise (like downhill running), drinking 25g of collagen or dairy protein immediately after and for the next two days will not speed up your recovery or reduce soreness any more than drinking a placebo with the same calories. Focus on total daily protein intake and sleep rather than timing specific recovery supplements.

Whey protein supplementation does not improve bone health biomarkers (formation, resorption, or turnover ratio) in male soldiers undergoing intense initial entry training compared to carbohydrate supplementation.

If you are undergoing intense military or athletic training, drinking whey protein shakes daily will not protect your bones from stress injuries any more than drinking a carbohydrate shake will. Focus on adequate total calorie intake, vitamin D exposure, and managing training load instead of relying on protein supplements for bone health.

Quercetin glucosides from onions have higher bioavailability and absorption rates than quercetin aglycones or rutinosides (from tea/apples) due to active transport mechanisms.

If you are seeking quercetin for health benefits, onions may be a more efficient source than tea or apples because your body absorbs the quercetin from onions better. The chemical form attached to sugar in onions allows for active absorption.

Systemic amino acid homeostasis is maintained by exchanging essential amino acids for non-essential ones and transferring amino groups from oxidized amino acids to biosynthesis, minimizing net loss through oxidation.

Your body actively recycles amino acids. It swaps essential for non-essential ones and reuses nitrogen from broken-down proteins to make new ones. This minimizes the need to constantly eat protein, though essential amino acids must still be obtained from food.

Vitamin C content in mangoes decreases significantly during ripening and postharvest storage, with levels dropping from high values in green fruit to lower values in ripe fruit.

If you are eating mangoes specifically for their Vitamin C content, choose less ripe fruits or consume them soon after purchase. Vitamin C levels drop significantly as the fruit ripens and during storage, so fresher, less ripe mangoes will provide more of this nutrient.

Mild mitochondrial uncoupling induces autophagy and mitophagy, which helps clear dysfunctional mitochondria and lipid droplets, potentially improving metabolic health.

Mild stress on mitochondria, such as that induced by exercise or cold, triggers the body's cleanup crew (autophagy). This process removes old mitochondria and fat stores, which is beneficial for metabolic health. This is a natural adaptation to stress, not something to be forced with dangerous chemicals.

Laboratory values (e.g., albumin, prealbumin) are poor standalone indicators of nutritional status due to their sensitivity to inflammation and other non-nutritional factors, and should be interpreted within the clinical context.

Do not use albumin or prealbumin levels alone to diagnose malnutrition, especially in acutely ill or inflamed patients. These markers are influenced by disease state and inflammation. Use them as part of a broader assessment including clinical history, physical exam, and functional measures.

Global dietary micronutrient supplies have improved over the last 50 years, but sub-Saharan Africa is the only region where micronutrient density has declined due to a shift toward lower-density staples like rice and maize.

To improve your diet, prioritize foods that are dense in vitamins and minerals (vegetables, fruits, lean meats, legumes) rather than just filling up on empty calories like refined grains or sugars. In regions where staple crops are low in nutrients, diversifying the diet or using fortification is critical.

Saturated fatty acids, particularly palmitate, induce hepatocyte apoptosis via ER stress, JNK activation, and death receptor pathways, while monounsaturated fatty acids (MUFAs) like oleate can be cytoprotective by sequestering palmitate into neutral triglycerides.

The type of fat you eat matters for liver health. High intake of saturated fats (like palmitate) can directly damage liver cells, while monounsaturated fats (like oleate) may help protect the liver by storing toxic fats safely as triglycerides.

Increasing long-chain omega-3 fatty acid intake (via supplements or dietary replacement) does not significantly reduce all-cause mortality, cardiovascular mortality, or major cardiovascular events in primary or secondary prevention populations.

If you are trying to prevent heart disease or reduce your risk of dying from cardiovascular causes, simply taking omega-3 supplements or eating more fatty fish is unlikely to make a significant difference based on current high-quality evidence. Focus on proven lifestyle factors like blood pressure management, smoking cessation, and overall diet quality rather than relying on omega-3 supplementation for prevention.

Daily oral taurine supplementation (1000 mg/kg body weight) in middle-aged mice extends median life span by 10-12% and increases life expectancy at 28 months by 18-25% while improving health span across multiple organ systems.

For middle-aged individuals, maintaining adequate taurine levels may support healthy aging. While this study used high doses in mice, human observational data links lower taurine levels to adverse health outcomes. Consult a healthcare provider before starting supplementation, especially if you have existing health conditions.

Taurine supplementation improves health span metrics in middle-aged mice, including reduced body weight gain, improved bone mass and strength, enhanced muscle endurance and strength, reduced anxiety, improved memory, better glucose homeostasis, and ameliorated immune cell prominence.

Taurine supplementation in middle age may support overall health, including bone, muscle, and metabolic function. While human trials are needed, these findings suggest potential benefits for healthy aging.

Equol is produced by only 25-50% of humans via gut bacteria, and this 'equol producer' status determines whether dietary soy provides significant health benefits.

Only about half of people produce 'equol' from soy. If you don't, eating soy might not give you the hormonal benefits others get. You can test your status or take equol supplements directly.

Microalgae species with robust cell walls (e.g., Porphyridium, Phaeodactylum) exhibit significantly lower in vitro digestibility compared to species with simpler cell structures (e.g., Arthrospira, Chlorella vulgaris), limiting nutrient bioavailability.

If you are choosing a microalgae supplement, look for species known for high digestibility like Arthrospira (Spirulina) or Chlorella vulgaris. Species like Porphyridium or Phaeodactylum may have lower nutrient absorption due to tough cell walls. Processing methods (like breaking cell walls) can mitigate this, but raw biomass digestibility varies significantly by strain.

The kynurenine/tryptophan (Kyn/Trp) ratio in blood serves as a robust biomarker for the rate of physiological aging (inflammaging) and predicts age-related diseases and mortality.

You can monitor your Kyn/Trp ratio as a blood test to assess your biological aging rate and risk for age-related diseases. A higher ratio indicates increased inflammatory activity associated with aging. This is a diagnostic tool, not a treatment, but it helps identify who might benefit from lifestyle interventions targeting inflammation.

Fasting sweat glucose levels do not robustly predict fasting blood glucose levels across a population of healthy and diabetic subjects, limiting the use of sweat glucose for universal diabetes diagnostics.

Do not rely on sweat glucose sensors to make immediate medical decisions about insulin dosing or hypoglycemia treatment based on population averages. The correlation between sweat and blood glucose is too weak and variable across individuals. Current technology may support personalized longitudinal tracking, but it is not yet a universal diagnostic tool.

Selenium's biological activity is primarily mediated through its incorporation into selenoproteins (containing selenocysteine), which support antioxidant defense systems, thyroid hormone metabolism, and neuroprotection.

Selenium works by forming selenoproteins. Ensuring adequate intake (55 µg/day) allows your body to produce these proteins, which protect cells from oxidative stress and support thyroid and nervous system health.

Inhibition of mTORC1 activity is a necessary physiological trigger for initiating autophagy during nutrient deprivation, which recycles cellular components to sustain blood glucose and amino acid levels.

Fasting works by turning off the 'growth' signal (mTORC1), which unlocks the body's internal recycling system (autophagy). This system breaks down old cellular parts to create glucose and amino acids, keeping you alive and healthy during food scarcity. You cannot have this benefit if your body is constantly in 'growth mode' due to constant eating.

Iron status has a dual role in immunity: deficiency impairs immune cell function (B-cells, T-cells), but excess iron during infection can be exploited by pathogens, leading to an evolutionary mechanism of hypoferremia (iron withdrawal) during acute infection.

Maintain healthy iron levels through diet (red meat, beans, leafy greens) to support immune cell function. However, if you have a serious active infection (like malaria or TB) or a condition like hemochromatosis, consult your doctor before taking iron supplements, as excess iron can help pathogens grow. The body naturally restricts iron during infection (hypoferremia) to fight this.

The presence of uncultured gut bacteria encoding the ismA gene (cholesterol dehydrogenase) metabolizes intestinal cholesterol into coprostanol, which is poorly absorbed, thereby significantly reducing both fecal and serum total cholesterol levels in humans.

This paper identifies a specific group of gut bacteria (encoding the ismA gene) that converts cholesterol into a form (coprostanol) that your body doesn't absorb, lowering your blood cholesterol. The effect is as strong as your genetic predisposition. While you cannot currently prescribe these specific uncultured bacteria, this highlights that your gut microbiome is a key lever for heart health. Future interventions may target these bacteria to lower cholesterol without drugs.

The gut bacterium Eubacterium rectale causally decreases plasma levels of hydrogen sulfite, a toxin that negatively affects cardiovascular function.

Maintaining a healthy gut microbiome, specifically by supporting bacteria like Eubacterium rectale, may help reduce hydrogen sulfite levels in your blood, which is beneficial for cardiovascular health.

High intake of red meat (both processed and unprocessed) is associated with increased all-cause mortality and mortality from nine specific causes, including cancer, cardiovascular disease, and respiratory disease.

If you eat red meat, consider reducing your intake. The study suggests that replacing red meat with white meat (especially unprocessed poultry or fish) lowers the risk of death from various causes, including heart disease and cancer, without needing to cut total meat consumption.

Heme iron and nitrate/nitrite from processed meat independently contribute to increased mortality risk, with nitrate accounting for a larger proportion of the risk from processed red meat.

The health risks of processed red meat are largely due to heme iron and added nitrates/nitrites. Choosing unprocessed meats or those without added nitrates may mitigate these specific risks.