Browse the evidence

Supplementation with high-dose Vitamin E and/or Vitamin C blunts skeletal muscle adaptations to endurance and resistance training, including mitochondrial biogenesis and hypertrophy signaling pathways, without improving performance metrics like VO2max.

If you are training to improve fitness or build muscle, avoid high-dose Vitamin C and E supplements. They block the cellular signals your body needs to adapt to exercise. Instead, get your antioxidants from whole foods like fruits and vegetables, which support health without interfering with your training progress.

Strength training does not significantly affect maximal oxygen uptake (VO2max), velocity at VO2max, blood lactate levels, or body composition in middle- and long-distance runners.

Do not expect strength training to increase your VO2max or change your body weight significantly. Its primary benefit lies in improving running economy and sprint speed, not aerobic capacity or body composition.

Increased appetite during a depressive episode is the primary driver of associations between depression and metabolic/inflammatory markers (BMI, metabolic syndrome components, waist circumference, CRP, TNF-α).

If you are depressed and experiencing increased appetite, this is a specific biological subtype ('immuno-metabolic depression') linked to higher inflammation and metabolic risk. It is not just 'overeating' but a symptom. Standard antidepressants may not address this. Discuss with your doctor whether treatments targeting inflammation (like anti-inflammatories or statins, though evidence is mixed) or lifestyle interventions (diet, weight loss) might be beneficial for this specific subtype.

Decreased mitochondrial biogenesis and dysregulated lipid oxidation lead to compromised skeletal muscle bioenergetic status (low ATP) and muscle wasting in early critical illness.

Early muscle loss in the ICU is driven by a failure of the muscle's energy factories (mitochondria) to produce ATP, not just by lack of movement. This metabolic shutdown prevents recovery even if nutrition is provided.

Glucagon receptor signaling regulates hepatic lipid metabolism by stimulating beta-oxidation and inhibiting lipogenesis, thereby reducing hepatic lipid accumulation.

Glucagon plays a crucial role in how your liver handles fat. While high glucagon in diabetes can be problematic, activating glucagon receptors (especially when combined with GLP-1) helps the liver burn fat and reduces liver fat storage. This is why combination therapies are effective for metabolic health.

Glucagon stimulates lipolysis in rodent adipocytes but has no significant lipolytic effect on human adipocytes at physiological concentrations.

Unlike in mice, glucagon does not directly trigger significant fat breakdown in human fat cells at normal levels. Its main job in lipid metabolism is managing fat in the liver, not burning fat from storage cells.

Aging is characterized by a loss of structural and functional complexity in physiological systems, which impairs adaptability and leads to disease.

View aging not just as damage accumulation, but as a loss of system flexibility. Maintaining diverse physical and cognitive challenges may help preserve the 'complexity' that protects against sudden health failures.

Klotho protein functions as an anti-aging agent by inhibiting four major aging pathways (TGF-β, IGF-1, Wnt, NF-κB) and promoting antioxidant defenses, with deficiency leading to accelerated aging phenotypes and overexpression extending lifespan.

Maintaining healthy kidney function and managing metabolic health (blood sugar, blood pressure) may help preserve natural Klotho levels, which are linked to longevity. While direct Klotho supplementation is not yet a standard consumer intervention, lifestyle factors that support kidney health and reduce inflammation (like exercise and certain diets) are associated with higher Klotho expression.

Aging causes a progressive decline in brown adipose tissue (BAT) mass and thermogenic activity, primarily through mitochondrial dysfunction, reduced sympathetic nervous system stimulation, and hormonal shifts, leading to age-related metabolic alterations.

As you age, your body's ability to burn fat for heat (via brown fat) naturally declines due to changes in hormones, nerve signals, and cell health. This contributes to weight gain and metabolic issues. While you can't stop aging, understanding this process highlights the importance of maintaining metabolic health through lifestyle factors that may support remaining brown fat function, such as staying active and managing stress/hormonal health.

Beige adipose tissue formation declines with age due to defective progenitor cell proliferation and differentiation, potentially linked to changes in the adipose tissue microenvironment and reduced SIRT1 levels.

Your body's ability to create 'beige fat' (fat that burns energy) decreases as you age, partly because the stem cells that make it become less active. This is linked to changes in your body's internal environment and signaling molecules. While this decline is natural, it underscores the importance of maintaining overall metabolic health to support any remaining thermogenic capacity.

Physical activity level (PAL) in humans is biologically constrained, with a maximum sustainable value of approximately 2.0-2.5, meaning energy intake, not just activity, drives obesity trends.

You cannot simply 'out-exercise' a poor diet because your body has a hard limit on how much energy you can burn through daily activity (max PAL ~2.5). Since energy expenditure doesn't scale infinitely with activity, managing energy intake is the critical lever for body mass regulation.

Obesity-induced adipose tissue dysfunction and systemic insulin resistance drive the development of MAFLD/NASH, which in turn exacerbates cardiovascular disease risk through the release of pro-atherogenic, pro-coagulant, and pro-inflammatory mediators from the liver.

If you have fatty liver disease (MAFLD/NASH), your liver is actively sending chemical signals that increase your risk of heart disease and stroke, independent of your weight. Managing liver health through weight loss and metabolic control is critical for cardiovascular protection, not just liver protection.

Obesity causes structural and functional cardiac alterations, including left ventricular hypertrophy, diastolic dysfunction, and atrial fibrillation, primarily through increased blood volume, cardiac output, and neuro-hormonal activation (RAAS).

Excess body weight forces your heart to work harder by increasing blood volume and output, leading to thickening of the heart muscle (LVH) and stiffening of the heart chambers. This structural change happens even if you feel no symptoms and increases the risk of heart failure and arrhythmias like atrial fibrillation.

Elevated atmospheric CO2 concentrations (eCO2) significantly reduce the protein content of C3 staple crops (rice, wheat, barley, potato), leading to a global increase in the population at risk of protein deficiency by 2050.

This research highlights a systemic risk to global food security rather than an individual intervention. For individuals, the key takeaway is to support agricultural policies that promote crop diversification, particularly the breeding of crops resilient to high CO2, and to prioritize diets that include protein sources less affected by eCO2 (like C4 crops or legumes) where possible. For policymakers, it underscores the urgent need to incorporate crop nutrient decline into food security models.

The gut-microbiome derived metabolite 3-(4-hydroxyphenyl)lactate is significantly associated with hepatic fibrosis and steatosis in NAFLD, sharing a significant genetic determination with these liver conditions.

This research highlights that a specific gut-derived metabolite, 3-(4-hydroxyphenyl)lactate, is linked to liver scarring (fibrosis) and fat accumulation in NAFLD. While this is a biomarker finding rather than a direct treatment, it suggests that modulating gut microbiome composition or function could be a future therapeutic target for managing NAFLD progression. Patients should focus on general gut health through fiber-rich diets and avoiding unnecessary antibiotics, as these support a healthy microbiome, though specific 'probiotic' prescriptions for this metabolite are not yet established.

High-fat diet-induced obesity reduces intestinal IgA+ immune cells and secretory IgA, which exacerbates insulin resistance by increasing intestinal permeability, microbial encroachment, and systemic inflammation.

Maintaining gut immune health, specifically IgA levels, may be crucial for managing insulin resistance during high-fat diets. While this study is in mice, it suggests that interventions supporting gut immunity (like certain diets or therapies) might help metabolic health.

Current glucose-lowering therapies, specifically metformin and bariatric surgery, alter intestinal IgA+ B cell populations and fecal secretory IgA levels, respectively.

If you are taking metformin or had bariatric surgery, part of their benefit may come from restoring gut IgA levels, which helps control inflammation and glucose.

The hypothalamus regulates basal metabolic rate (RMR) and adaptive thermogenesis through distinct neuronal populations and hormonal axes, with lean mass and thyroid hormone signaling being primary determinants of energy expenditure.

Focus on preserving lean muscle mass, as it is the largest driver of your resting metabolic rate. Your brain's hypothalamus regulates your baseline calorie burn through hormonal signals (like thyroid and leptin) and neural pathways. While exercise matters, your body's internal 'thermostat' sets the stage for how efficiently you burn energy at rest.

Cold exposure induces adaptive thermogenesis primarily through non-shivering thermogenesis (NST) mediated by brown adipose tissue (BAT) and UCP1, regulated by the hypothalamus.

Exposure to cold temperatures can activate brown fat, which burns calories to generate heat. This process, called non-shivering thermogenesis, is regulated by your hypothalamus. While not a replacement for diet and exercise, leveraging cold exposure (like cooler room temps) may support metabolic health.

Mandatory front-of-package warning labels (e.g., octagonal stop signs) significantly reduce the purchase of unhealthy products and prompt industry reformulation, whereas voluntary or complex labeling systems (e.g., Guideline Daily Amount) have negligible or no effect on consumer behavior.

Support policies that mandate clear, high-contrast warning labels (like Chile's octagonal stop signs) on packaged foods. These labels are proven to reduce the purchase of unhealthy items and force manufacturers to improve recipes. Avoid supporting voluntary or complex labeling systems that fail to change behavior.

Elevated intracellular ceramide levels induce cellular senescence and contribute to age-related pathologies such as insulin resistance and atherosclerosis, whereas sphingosine-1-phosphate (S1P) delays senescence and promotes cell survival.

This research highlights that cellular aging is driven by specific lipid signals: high ceramide promotes aging/senescence, while S1P promotes youth/survival. While this paper does not prescribe a specific diet, it implies that interventions which lower ceramide or boost S1P (potentially through specific dietary fats or metabolic health) could theoretically delay aging. Focus on metabolic health to maintain favorable sphingolipid balances.

Ceramide accumulation in specific tissues (adipose, liver, muscle) during aging and high-fat diet consumption drives insulin resistance and inflammation, linking sphingolipid metabolism to type 2 diabetes.

High levels of specific lipids called ceramides, particularly C16-ceramide, are linked to insulin resistance and type 2 diabetes. This suggests that managing lipid metabolism and reducing the production of these specific lipids (potentially through diet and exercise) may help prevent or manage insulin resistance.

Consumer confidence in food safety, healthfulness, sustainability, and authenticity is primarily determined by beliefs about the openness, competence, and care of food chain actors (manufacturers, farmers, retailers, authorities), with openness being the strongest predictor of confidence.

For food producers and policymakers, building consumer confidence requires prioritizing transparency (openness) and demonstrating competence. Since consumers cannot verify health or sustainability claims themselves, they rely on trust in the actors. Therefore, clear, honest communication and proven capability are more critical than the claims themselves.

Nonalcoholic fatty liver disease (NAFLD) is a systemic condition with multifactorial pathogenesis, not merely a hepatic manifestation of metabolic syndrome, and it can precede the development of metabolic syndrome and type 2 diabetes.

NAFLD is not just a liver issue; it is a systemic metabolic disorder that can drive diabetes and heart disease risk. Even if you are lean, genetic factors or gut health issues can cause it. Focus on metabolic health markers (blood sugar, lipids) rather than just weight, and prioritize lifestyle changes that improve insulin sensitivity and gut health, as these address the root multifactorial causes.