Browse the evidence

Fsp27 (Cidec) deficiency in white adipose tissue induces a 'browning' effect, characterized by increased mitochondrial activity, smaller lipid droplets, and improved insulin sensitivity.

Fsp27 normally prevents white fat from acting like brown fat. When Fsp27 is absent, white fat starts behaving like brown fat (browning), increasing calorie burning and improving insulin sensitivity. This suggests that inhibiting Fsp27 could be a way to turn white fat into a metabolically active tissue that burns calories.

Acute resistance exercise and endurance exercise produce distinct, mode-specific plasma metabolomic signatures, with resistance exercise preferentially increasing nucleotide breakdown products and lactate, while endurance exercise preferentially increasing lipid metabolites and ketone bodies.

To maximize specific health benefits, choose your exercise mode intentionally. If you want to improve fat oxidation and ketone production, prioritize endurance exercise. If your goal is to enhance glycolytic capacity and nucleotide turnover (often linked to strength and power), prioritize resistance exercise. Doing both covers a broader metabolic spectrum.

Endurance exercise significantly increases circulating beta-hydroxybutyrate (BHBA), which acts as a signaling molecule that inhibits histone deacetylases (HDACs) and activates the HCA2 receptor, promoting anti-inflammatory and neuroprotective effects.

Endurance exercise naturally boosts BHBA, which helps protect your brain and reduce inflammation. You don't need to force a ketogenic diet to get these benefits; regular aerobic activity is sufficient to trigger this protective signaling pathway.

Systematic screening for NAFLD is not recommended by the AASLD even in high-risk populations due to lack of effective drug treatments, cost-effectiveness concerns, and unclear long-term benefits.

In the US, you likely won't be systematically screened for NAFLD even if you have diabetes, because there are no approved drugs for it yet. Focus on managing your metabolic health instead.

Endothelial dysfunction, characterized by impaired nitric oxide (NO) production and increased asymmetric dimethylarginine (ADMA), is an early and independent predictor of cardiovascular events in diabetes, often preceding clinical symptoms.

Your blood vessels' ability to dilate and function properly (endothelial function) is a critical early indicator of heart disease risk, often before plaque builds up. In diabetes, this function is impaired due to low nitric oxide and high ADMA. Managing insulin sensitivity and reducing oxidative stress can help improve endothelial health and reduce CVD risk.

Obstructive Sleep Apnea (OSA) is significantly underdiagnosed in patients undergoing bariatric surgery, with only 13.3% of patients having a prior diagnosis despite a 69.9% prevalence rate.

Many people with sleep apnea do not know they have it. If you are having bariatric surgery, assume you might have it even if you feel fine. The surgery team needs to check for it to keep you safe.

Monthly high-dose vitamin D3 supplementation (200,000 IU initial bolus followed by 100,000 IU monthly) without calcium does not reduce the incidence of invasive or in situ cancer in adults aged 50-84.

Taking 100,000 IU of vitamin D3 once a month (after an initial 200,000 IU dose) does not appear to lower your risk of developing cancer. If you are taking vitamin D for cancer prevention, this specific high-dose monthly regimen is not supported by this evidence. You might discuss daily or weekly lower-dose strategies with your doctor, as this study suggests those methods warrant further investigation.

Higher baseline depression scores are associated with poorer treatment outcomes in CBT for insomnia, indicating that psychological distress may reduce the efficacy of sleep-focused therapy.

If you are struggling with both insomnia and depression, be open with your therapist. Your sleep treatment may be less effective if your depression is not addressed. Integrating mental health support with CBT may improve your sleep outcomes.

Inulin supplementation increases the abundance of Bifidobacterium, but this increase is a signature of intake rather than a direct driver of the observed metabolic improvements.

Don't assume that just because inulin boosts Bifidobacterium, that this specific bacteria is responsible for your health benefits. The actual metabolic improvements are linked to other changes in your gut bacteria, such as a decrease in Desulfovibrio and Clostridium sensu stricto.

Excessive consumption of certain seaweeds, particularly those high in iodine or accumulating toxic metals like arsenic, cadmium, or lead, poses potential health risks and requires adherence to safety regulations regarding toxic element limits.

Be mindful of the source and type of seaweed you consume. Some seaweeds, especially brown varieties like Kombu, are extremely high in iodine, which can be harmful in excess. Others may accumulate toxic metals like arsenic or lead. To minimize risk, choose seaweeds from regulated aquaculture sources and vary your intake to avoid excessive exposure to any single mineral or toxin.

Consumer acceptance of alternative proteins is significantly hindered by sensory challenges, including inferior taste, texture, and off-flavors, which are difficult to replicate compared to animal meat.

If you are trying alternative proteins, manage your expectations regarding taste and texture. They may not perfectly replicate meat. Experiment with different brands and recipes to find ones you enjoy.

In obese individuals, chronically elevated leptin levels induce leptin resistance through impaired blood-brain barrier transport and central receptor signaling deficits, rendering exogenous leptin therapy ineffective for weight loss.

If you are obese, your body likely already has high levels of leptin, but your brain has stopped listening to it (leptin resistance). Therefore, taking leptin supplements or injections will not help you lose weight. The focus should be on improving metabolic sensitivity rather than adding more hormone.

Leptin regulates energy homeostasis not only by acting as a satiety signal in the arcuate nucleus but also by modulating synaptic plasticity and reward perception in extrahypothalamic areas like the ventral tegmental area and striatum.

Your brain's reward system plays a huge role in how much you eat. Leptin helps dampen the 'high' you get from food. In obesity, this reward-dampening fails, making food more appealing. Understanding this biological reward drive can help reduce self-blame for cravings.

Leptin resistance in obesity is driven by impaired transport of leptin across the blood-brain barrier, largely due to saturation by high endogenous levels and inhibition by hypertriglyceridemia.

High blood triglycerides can block leptin from reaching the brain. Managing blood fats may help improve leptin sensitivity.

In euthyroid middle-aged adults, higher free T3 levels and a higher FT3-to-FT4 ratio are positively associated with unfavorable metabolic profiles (higher BMI, waist circumference, triglycerides, blood pressure, fasting glucose, and lower HDL) and increased cardiovascular risk markers (IL-6, hs-CRP, pulse wave velocity).

If you are in the middle-aged range and have metabolic issues (high blood pressure, high triglycerides, central obesity) despite having 'normal' thyroid labs, the ratio of your Free T3 to Free T4 might be a contributing factor. A higher ratio (driven by higher T3 or lower T4) is linked to worse metabolic markers. This suggests that 'normal' TSH doesn't guarantee optimal metabolic health, and the internal conversion of T4 to T3 matters.

Suprapharmacologic doses of anabolic-androgenic steroids (AAS) increase muscle mass and strength in eugonadal men, whereas physiologic doses do not.

If you are a natural, eugonadal male, standard training and nutrition will not trigger the anabolic effects of steroids. The literature indicates that only doses far exceeding physiological levels (10-100x normal) produce significant muscle and strength gains in healthy men. Physiologic replacement doses have no additive benefit over training alone.

In humans, circulating FGF21 exhibits a circadian rhythm with a nocturnal rise peaking in the early morning, and this pattern is driven by oscillations in free fatty acids (FFAs) which stimulate hepatic FGF21 expression via PPARα activation.

This paper establishes that FGF21, a hormone regulating energy metabolism, rises naturally at night in humans, driven by free fatty acids. For obese individuals, this natural nocturnal rise is blunted. While this paper does not prescribe a specific intervention, it suggests that maintaining healthy fatty acid levels (via diet/exercise) may support this natural circadian rhythm, which is disrupted in obesity.

Elevated circulating levels of branched-chain amino acids (BCAAs) and fatty acids (FAs) induce insulin resistance and metabolic dysfunction by promoting mitochondrial dysfunction and activating pro-inflammatory signaling pathways (NF-κB and NLRP3).

High levels of BCAAs and fatty acids in your blood are linked to insulin resistance and inflammation, which drive metabolic diseases. This often happens when your body struggles to process these nutrients (common in obesity or T2D) rather than just from eating them. Focus on improving metabolic flexibility and insulin sensitivity through exercise and balanced nutrition rather than assuming high BCAA/Fat intake is always beneficial.

Senescent human cells in vivo can be identified and quantified using a biomarker for senescence-associated beta-galactosidase (SA-β-Gal) activity at pH 6, which correlates with replicative age and accumulates in aging skin.

This research establishes a reliable method to identify senescent cells in human tissue using a specific enzyme activity (SA-β-Gal at pH 6). It confirms that these cells accumulate in the skin with age, providing a biological basis for age-related changes. For longevity research, this biomarker is a critical tool for validating interventions aimed at clearing senescent cells (senolytics) or preventing their accumulation.

Expression of the Ink4a/Arf locus (p16INK4a and Arf) serves as a robust biomarker of mammalian aging, with expression levels increasing significantly across multiple tissues as organisms age.

This research identifies p16INK4a and Arf as key molecular markers that increase with age in various tissues. While not yet a standard clinical test for everyone, these markers may eventually help predict disease risk and tissue regenerative capacity, offering a way to measure 'biological age' rather than just chronological age.

Ets-1 expression strongly correlates with p16INK4a expression with aging, suggesting Ets-1 is a principal determinant of p16INK4a expression in vivo.

The transcription factor Ets-1 is strongly linked to the increase of p16INK4a during aging. This suggests that stress signals activating Ets-1 may drive the expression of aging-related genes in tissues.

Bariatric surgery is the most effective treatment for both obesity and T2DM, offering benefits beyond weight loss by recovering islet function and normalizing gut hormones.

For severe obesity and T2DM, bariatric surgery is currently the most effective treatment, working by restoring gut hormones (GLP-1, PYY) and beta-cell function, not just by reducing stomach size. It should be considered when lifestyle changes fail, despite surgical risks.

Shifting global production to match the Harvard Healthy Eating Plate (HHEP) recommendations would save 51 million hectares of arable land compared to current production levels.

Producing food according to nutritional guidelines (more fruits/veg, less grain/sugar) is more land-efficient than current practices. This shift saves 51 million hectares of arable land, preserving habitats and ecosystem services.

Adopting the HHEP diet increases total greenhouse gas (GHG) emissions by 49% compared to the current global diet, primarily due to increased animal-source protein consumption.

A diet that meets nutritional guidelines (HHEP) may increase GHG emissions if it relies on animal protein. To reduce emissions, combine healthy eating with plant-based proteins (legumes, seeds, nuts), which have a much lower GHG footprint.