Browse the evidence

Irisin, a myokine derived from FNDC5, promotes skeletal muscle hypertrophy and attenuates denervation-induced atrophy by activating IL-6 signaling and satellite cell elevation, although its role in human pathology remains under investigation.

Irisin shows promise in animal studies for building muscle and preventing atrophy, but its role in humans is still being defined. Exercise increases the precursor protein (FNDC5) in humans, but whether this translates to higher circulating irisin levels is debated. It is not yet a validated therapeutic target for human muscle gain.

Decorin is a myokine that directly binds to and inactivates myostatin, thereby promoting muscle growth by inhibiting myostatin's anti-myogenic effects and increasing pro-myogenic factors like Mighty and Myod1.

Decorin is a muscle-derived protein that helps build muscle by blocking myostatin, the body's natural muscle growth brake. By inactivating myostatin, decorin allows pro-growth signals to dominate. It is currently being studied as a potential treatment for muscle wasting.

In high-income countries, increased per capita caloric supply and higher urbanization rates are positively associated with a higher number of overweight and obese pregnant women, whereas in lower-middle income countries, a higher percentage of female employment in agriculture (indicating higher occupational physical activity) is inversely associated with this burden.

For policymakers and public health officials, this research highlights that reducing maternal obesity requires systemic changes rather than just individual advice. In high-income nations, strategies should focus on managing caloric supply and mitigating the sedentary effects of urbanization. In lower-income nations, supporting agricultural employment or increasing physical activity in service-sector jobs may help counteract obesity trends.

Vitamin D deficiency impairs mitochondrial respiration, increases reactive oxygen species (ROS), and accelerates cellular aging and apoptosis.

If you are vitamin D deficient, correcting this status may help protect mitochondrial function and reduce oxidative stress, which are linked to aging.

Breastfeeding is associated with lower blood pressure in childhood and a lower risk of developing obesity later in life compared to formula feeding.

Mothers should be supported to breastfeed exclusively for as long as possible, as it is associated with lower childhood blood pressure and reduced obesity risk.

Catheter-based renal denervation reduces sympathetic nerve activity and improves glucose metabolism in patients with resistant hypertension, polycystic ovary syndrome, and obstructive sleep apnea.

For patients with resistant hypertension, PCOS, or sleep apnea, renal denervation may improve glucose metabolism and insulin sensitivity by reducing sympathetic nerve activity. This is a procedural option, not a first-line treatment.

Elevated plasma DPP-4 activity is positively correlated with obesity (BMI) and insulin resistance, potentially acting as a local mediator linking adipose tissue inflammation and hepatic insulin resistance to the pathogenesis of Type 2 Diabetes.

Higher levels of the enzyme DPP-4 are found in people with obesity and insulin resistance. This enzyme may contribute to inflammation in fat and liver tissue, worsening insulin resistance. While DPP-4 inhibitors treat diabetes by preserving incretins, the underlying high DPP-4 levels in obesity might also play a role in metabolic dysfunction, though this mechanism is still being fully understood.

Combined Vitamin D and Calcium supplementation is associated with an increased risk of renal and urinary tract stones.

If you take combined Vitamin D and Calcium supplements, be aware that it may slightly increase your risk of developing kidney stones, particularly if you are a postmenopausal woman. Stay hydrated and discuss your personal risk factors with your healthcare provider.

Age-related changes in IgG glycosylation, specifically the decrease in galactosylation, promote systemic inflammation (inflammaging), which actively contributes to the deterioration of the aging organism.

This research highlights that inflammation is a key driver of aging, linked to specific changes in your immune system's sugar coatings. While you cannot directly 'take' a glycan supplement, understanding that lifestyle factors (diet, stress, activity) influence these pathways suggests that maintaining a healthy lifestyle may help preserve beneficial glycosylation patterns, potentially slowing inflammatory aging.

Increasing physical activity has only a weak association with preventing future weight gain in observational studies, and clinical trials provide uncertain conclusions on whether increasing activity effectively prevents obesity de novo.

Current evidence suggests that while physical activity is recommended for general health, relying on it alone to prevent obesity is uncertain due to weak associations and measurement errors in studies. Public health advice remains to advocate for 45-60 minutes of moderate intensity activity daily, but expectations for significant weight prevention should be managed.

The impact of exercise on sleep in children, adolescents, and young adults is mixed and less consistent than in older adults.

For younger people, exercise still generally helps sleep, but the results are less predictable. Don't be discouraged if you don't see immediate changes. Focus on consistent activity rather than intensity or timing, as the body's response is more variable in these age groups.

Serum from young overweight men after 3 weeks of lifestyle intervention reduces hepatocellular carcinoma (HepG2) cell proliferation and lipid accumulation compared to pre-intervention serum.

While this is an in vitro finding, it suggests that the metabolic improvements from weight loss and exercise may create a blood environment less conducive to liver cancer cell growth.

2-deoxy-D-glucose (2DG) acts as a calorie restriction mimetic by inhibiting glycolysis, thereby reducing plasma insulin and body temperature without significantly reducing food intake or body weight in rats.

This paper discusses 2-deoxyglucose (2DG) as a potential anti-aging compound in rats that lowers insulin and body temperature without dieting. However, it also notes that high doses are toxic and cause heart failure in rats. There is no human protocol provided, and the compound is not currently a standard human supplement due to safety concerns and lack of long-term human data.

Inhibition of de novo ceramide synthesis (via SPT inhibitors like myriocin or genetic knockdown) reverses insulin resistance and improves glucose tolerance in rodent models of obesity and high-fat feeding.

This research suggests that high levels of ceramides, often resulting from saturated fat intake and obesity, actively block insulin signaling. While this study used drug inhibitors in mice, it implies that reducing saturated fat intake or managing lipid metabolism might be crucial for improving insulin sensitivity in humans, beyond just calorie counting.

Saturated fatty acids induce insulin resistance by activating TLR4, which drives the transcriptional upregulation of enzymes for de novo ceramide synthesis.

Saturated fats may trigger an inflammatory response (TLR4) that increases ceramide levels, blocking insulin. This suggests that the type of fat matters more than just the presence of fat, as unsaturated fats do not appear to trigger this specific pathway.

Adiponectin improves metabolic health by activating ceramidase, which degrades ceramide and promotes the production of sphingosine-1-phosphate (S1P), thereby opposing ceramide's inhibitory effects on insulin signaling.

Adiponectin, a hormone that improves insulin sensitivity, works by breaking down toxic ceramides. Since adiponectin levels are often low in obesity, maintaining a healthy weight and exercising may be the most effective way to support this protective hormonal pathway.

Activation of AMPK in adipose tissue reduces the secretion of pro-inflammatory cytokines (TNFα and IL-6) and may increase the secretion of the insulin-sensitizing hormone adiponectin.

AMPK activation in fat cells helps lower inflammation (TNFα, IL-6) which is linked to insulin resistance. The effect on boosting beneficial hormones like adiponectin is less clear but may occur indirectly.

Exogenous environmental factors, including diet, stress, and exercise, induce direct or indirect epigenetic modifications (DNA methylation, histone modification, RNA silencing) that can permanently alter gene expression profiles and influence health outcomes across the human lifespan.

Your lifestyle choices (diet, stress management, exercise) are not just temporary fixes; they chemically tag your DNA and histones, potentially altering gene expression for the long term. While you cannot change your DNA sequence, you can influence how those genes are read through consistent environmental inputs, particularly during critical developmental windows and throughout adulthood.

Curcumin, a dietary polyphenol, acts as both a direct and indirect epigenetic factor by inhibiting Histone acetyltransferase p300/CBP and GATA4, reducing nuclear acetylation and myocardial cell hypertrophy.

Curcumin inhibits enzymes that promote histone acetylation and cell hypertrophy. While mechanistic data exists, specific dosing protocols for humans are not provided in this review.

Cellular senescence and the resulting Senescence-Associated Secretory Phenotype (SASP) are primary drivers of chronic low-grade inflammation (inflammaging) in aging, contributing to age-related diseases such as atherosclerosis, cancer, and diabetes.

Aging is associated with the accumulation of senescent cells that secrete inflammatory signals (SASP), contributing to chronic low-grade inflammation. While lifestyle factors like diet and smoking contribute, they are not the sole drivers; internal biological aging processes play a critical role. Emerging research suggests targeting these senescent cells (senolytics) may be a future strategy to reduce inflammation and improve healthspan.

Dysregulation of the gut microbiota (dysbiosis) in the elderly, characterized by decreased diversity and reduced anti-inflammatory bacteria, is a source of chronic low-grade inflammation.

Gut health changes with age, often showing reduced diversity and fewer beneficial bacteria. This dysbiosis is linked to higher levels of inflammatory cytokines. Maintaining gut health through diet may help manage inflammation, although the specific mechanisms are complex.

Population-level nutrition interventions focusing exclusively on individual behavior change have limited success because they ignore the social structural conditions (rules and resources) that constrain or enable food choices.

To improve population health, interventions must move beyond telling people what to eat. Instead, they must address the social structures that make healthy choices difficult, such as ensuring affordable access to food, modifying school policies, and supporting family meal norms.

Haploinsufficiency of the SIM1 gene causes severe early-onset obesity by disrupting the development of hypothalamic nuclei (specifically the PVN) that regulate energy balance and food intake.

This paper identifies a specific genetic cause for severe obesity. For patients with early-onset, profound obesity and normal metabolic rates, genetic testing for SIM1 mutations or translocations may be warranted. Standard lifestyle interventions may be insufficient due to the biological drive for intake; medical management targeting the melanocortin pathway may be necessary.

Long sleep duration (excessive) is independently associated with increased mortality risk in the elderly population, likely due to sleep fragmentation and underlying health conditions rather than sleep duration itself.

If you are an older adult sleeping significantly more than recommended, do not assume it is healthy. It may be a sign of underlying health issues or poor sleep quality (fragmentation). Consult a healthcare provider to investigate the cause.