Browse the evidence

Body weight and BMI are inaccurate measures of health status because they fail to distinguish between lean soft tissue (LST) and fat mass, leading to misclassification of nutritional status in elderly and clinical populations.

Stop relying solely on the scale or BMI to judge your health or nutritional status, especially if you are older or have a medical condition. These metrics hide the critical shift between losing muscle and gaining fat. Use imaging (like DXA or CT) or more detailed assessments to measure Lean Soft Tissue (LST) if you need accurate nutritional risk assessment.

Bariatric surgery (specifically metabolic procedures like Roux-en-Y gastric bypass) produces greater diabetes remission and weight loss than purely restrictive procedures (like gastric banding) due to hormonal and neural changes.

If you have extreme obesity, metabolic surgery (like gastric bypass) is more effective than restrictive surgery (like bands) for curing diabetes and losing weight because it changes your gut hormones, not just your stomach size. Discuss with a specialist if you are a candidate.

Reduction of dietary intake (Dietary Restriction) extends lifespan by modulating the proteostasis machinery, specifically by reducing translation rates and enhancing autophagy, thereby preventing the accumulation of misfolded proteins.

Dietary restriction, specifically reducing caloric intake to approximately 60% of ad libitum levels, has been shown to extend lifespan in multiple species by modulating proteostasis. This involves reducing protein translation and enhancing autophagy to clear misfolded proteins. While the exact human application requires further research, the mechanism suggests that controlled caloric reduction may support cellular health and longevity.

Reduced Insulin/IGF-1 Signaling (IIS) extends lifespan by allowing transcription factors like DAF-16 and HSF-1 to enter the nucleus and activate proteostasis genes, including chaperones and autophagy components.

Reduced Insulin/IGF-1 Signaling (IIS) extends lifespan by allowing transcription factors like DAF-16 and HSF-1 to enter the nucleus and activate proteostasis genes, including chaperones and autophagy components.

Autophagy induction, particularly macroautophagy, is necessary for lifespan extension by Dietary Restriction and reduced IIS, and pharmacological induction (e.g., rapamycin) can increase longevity.

Inducing autophagy, either through Dietary Restriction or pharmacological agents like rapamycin, extends lifespan. Rapamycin treatment in mice at 600 days significantly increased longevity, suggesting that enhancing cellular cleanup mechanisms is a viable strategy for promoting healthspan.

Circulating miR-19a/b and miR-125b are associated with features of metabolic syndrome and cardiovascular disease risk, including biomarkers of atherosclerosis.

Elevated levels of miR-19a/b and miR-125b in the blood may signal an increased risk of cardiovascular issues and metabolic dysfunction in people with fatty liver. This suggests that liver health is closely tied to heart health, and monitoring these markers could help assess overall metabolic risk.

Liver expression of miR-122 is downregulated in NASH compared to simple steatosis, despite being upregulated in the serum, suggesting a release mechanism from lipid-laden hepatocytes.

In advanced fatty liver disease (NASH), the liver itself contains less miR-122, but more of it is found in the blood. This suggests that as liver damage progresses, the liver releases this molecule into the bloodstream, making blood tests a useful proxy for liver health.

Adjuvant chemotherapy for breast cancer causes weight gain primarily through reduced physical activity and sarcopenic obesity (fat gain with lean mass loss), not through increased caloric intake.

If you are gaining weight during breast cancer chemotherapy, do not blame yourself for eating too much. Research shows that caloric intake does not significantly increase during this time. Instead, the weight gain is driven by a drop in physical activity and a loss of muscle mass (sarcopenic obesity). The most effective intervention is to increase physical activity, specifically resistance training for the legs, to preserve muscle and prevent fat gain.

Activation of the GLP-1 receptor promotes pancreatic beta-cell proliferation and inhibits apoptosis, leading to expanded beta-cell mass and improved glucose tolerance in diabetic animal models.

GLP-1 based therapies (like exendin-4 or liraglutide) do more than just lower blood sugar; they appear to help the pancreas grow more insulin-producing cells and protect existing ones from dying in diabetic animal models. This suggests a potential disease-modifying benefit beyond glucose control.

Ethanol consumption activates Sterol Regulatory Element-binding Protein-1 (SREBP-1) via its metabolite acetaldehyde, leading to increased transcription of lipogenic genes (FAS, SCD, ACL, ME) and subsequent hepatic triglyceride accumulation (fatty liver).

Alcohol consumption directly promotes fat storage in the liver by activating specific genes (SREBP-1) that build fat, independent of just the calories consumed. This happens because your body converts alcohol into acetaldehyde, which triggers this fat-building pathway. To minimize fatty liver risk, limiting alcohol intake is critical, as even moderate amounts can drive this process.

Aging in human tissue is associated with a significant decline in NAD+ levels, driven by PARP hyperactivation due to accumulated oxidative DNA damage, which subsequently reduces SIRT1 activity and energy production.

This research highlights that NAD+ levels naturally decline with age in humans, partly due to DNA repair demands (PARP activity). While this paper does not prescribe a specific intervention, it supports the theoretical basis for NAD+ boosting strategies (like NMN or NR supplementation) aimed at mitigating age-related metabolic decline. Focus on managing oxidative stress through diet and lifestyle to potentially spare NAD+ stores.

Dietary interventions do not significantly reduce symptoms of anxiety.

While improving your diet can help with depressive symptoms, it is not currently supported by evidence as a primary treatment for anxiety. If you are struggling with anxiety, rely on established treatments like therapy or medication, and use diet as a supportive tool for overall well-being rather than a specific anxiety cure.

Obesity is associated with impaired immune competence, including reduced antibody and IFN-gamma production, leading to increased susceptibility to infections and poorer vaccination responses.

Maintaining a healthy weight through balanced nutrition and regular physical activity can support your immune system. If you are obese, consider discussing weight management strategies with your healthcare provider to improve immune function and vaccination response.

Ageing is associated with immunosenescence, leading to increased susceptibility to infections and poorer responses to vaccination.

As you age, your immune system naturally weakens. Ensure you are up-to-date on vaccinations, including flu and pneumonia shots, and maintain a nutrient-rich diet to support your immune health.

HOMA-IR cut-off values for identifying metabolic syndrome should be lowered and adjusted for age and gender rather than using fixed population percentiles, as lower thresholds (e.g., 1.85-2.05) better identify cardio-metabolic risk.

If you are being screened for insulin resistance using HOMA-IR, do not assume a single 'normal' number applies to you. Your risk profile changes with age and gender. For non-diabetic women, the threshold for concern drops as they age past 50. Ask your provider to interpret your HOMA-IR score in the context of your specific metabolic risk factors (blood pressure, lipids, waist size) rather than a generic population average.

Expression of PGC-1α in muscle cells increases mitochondrial proton leak, resulting in a higher proportion of respiration uncoupled from ATP production compared to PGC-1β.

This research explains why some muscle fibers are more 'leaky' than others. PGC-1α promotes a state where some energy is released as heat (uncoupling) rather than stored as ATP. This is not a flaw but a feature that may protect cells from oxidative damage and allow for rapid energy response during exercise. It suggests that muscle type and genetic expression of PGC-1α determine whether your muscles prioritize efficiency (PGC-1β) or metabolic flexibility/heat production (PGC-1α).

PGC-1β stimulates mitochondrial biogenesis and respiration more potently than PGC-1α at similar mRNA levels, but maintains tighter coupling (less proton leak).

Your muscles use different strategies to handle energy. PGC-1β helps build a larger number of mitochondria that are highly efficient at producing ATP (low leak). This is useful when you need maximum power output. PGC-1α, conversely, builds fewer mitochondria that are 'leakier' (produce heat), which may offer protection against oxidative stress. The balance of these two proteins determines your muscle's metabolic personality.

Human adipose tissue contains persistent brown adipocytes expressing beta-3 adrenergic receptors (beta-3-AR) and uncoupling protein (UCP) mRNA throughout life, particularly in deep deposits like perirenal and omental fat, enabling thermogenesis and lipid metabolism regulation.

Your deep abdominal fat (around your organs) is not just inert storage; it contains active brown fat cells that can burn energy. These cells are regulated by beta-3 receptors. While this paper doesn't prescribe a drug, it suggests that targeting these specific receptors could theoretically help manage body fat and lipid metabolism by activating this hidden thermogenic capacity.

Stimulating de novo adipogenesis (adipocyte hyperplasia) in visceral white adipose tissue during caloric excess drives healthy tissue remodeling, maintaining insulin sensitivity and preventing metabolic syndrome.

Focus on where your body stores fat and how it handles it, not just the scale. Visceral fat accumulation and inability to create new fat cells (hyperplasia) are key drivers of metabolic disease. While you cannot directly 'choose' where fat goes, maintaining metabolic health through exercise and diet supports healthy adipose function. Avoid extreme caloric deficits that may overwhelm adipose expandability, leading to ectopic fat storage in organs.

Fibro-inflammatory progenitors (FIPs) in adipose tissue are anti-adipogenic and promote inflammation and fibrosis, contributing to unhealthy adipose remodeling.

Chronic inflammation in fat tissue can be driven by specific cell types (FIPs) that block healthy fat storage. Managing inflammation through diet and exercise may help reduce the activity of these anti-adipogenic cells, allowing for healthier fat tissue expansion.

Administration of the intestine-restricted FXR agonist fexaramine (FEX) improves glucose tolerance and promotes adipose tissue browning in mice by reshaping gut microbiota to increase lithocholic acid (LCA) production, which activates TGR5/GLP-1 signaling.

This research suggests that specific bile acid signaling, influenced by gut bacteria, plays a key role in how your body handles sugar and fat storage. While this study used a specific drug (fexaramine) in mice, it highlights the importance of gut health in metabolic regulation. For now, there is no direct human supplement equivalent, but maintaining a diverse gut microbiome through diet is a logical step to support these natural pathways.

Acute total sleep deprivation (24 hours) significantly increases plasma levels of serotonin, tryptophan, and taurine compared to normal sleep, potentially explaining the antidepressant effects of sleep loss.

One night of staying awake all night significantly raises levels of serotonin, tryptophan, and taurine in your blood. This chemical shift is linked to why sleep deprivation can sometimes temporarily lift mood (antidepressant effect), but it also disrupts normal metabolic rhythms. Prioritizing regular sleep helps maintain stable neurotransmitter levels and metabolic health.

Acute sleep deprivation increases plasma levels of specific acylcarnitines (medium- and long-chain saturated), suggesting altered fatty acid oxidation and potential links to fatigue or sleep signaling.

Staying awake for 24 hours increases specific fatty acid metabolites (acylcarnitines) in your blood, indicating your body is burning fat differently under sleep pressure. This metabolic shift may contribute to feelings of fatigue or changes in energy availability during sleep loss.

Uniaxial accelerometers (specifically the Lifecorder) significantly underestimate total energy expenditure (TEE) and physical-activity-related energy expenditure (PAEE) compared to respiratory chamber measurements, primarily due to errors in estimating basal metabolic rate and difficulty in assessing sedentary/low-intensity activities.

Do not rely on uniaxial waist-worn accelerometers (like the Lifecorder) for precise calorie counting. They systematically underestimate your true energy expenditure by about 8%. However, they are highly correlated with actual expenditure, making them useful for tracking relative changes in activity levels or for large-scale epidemiological studies, provided you understand the absolute numbers are likely too low.