Browse the evidence

Irisin, a myokine released from skeletal muscle during exercise, directly enhances osteoblast differentiation and bone formation markers (ALP and Collagen I) in vitro.

While this study is in mice and cells, it suggests that the benefits of exercise for bone health are partly due to chemical signals (Irisin) released by your muscles, not just the physical stress on your bones. This supports the importance of regular physical activity for maintaining bone density, especially as you age.

The 'thrifty genotype' hypothesis posits that specific genetic variants (e.g., INS-VNTR class III, ApoE4, mitochondrial variants) were selected for during historical famines to enhance survival and reproductive efficiency, but now predispose populations to obesity and diabetes in modern environments.

Your ancestors' survival during famines may have selected for genes that store energy efficiently. In a modern food-abundant world, this is a liability. Focus on maintaining physical activity and avoiding excessive caloric intake to counteract this biological predisposition.

GLP-1 receptor agonists (exendin-4 and liraglutide) improve memory deficits, reduce amyloid plaque load, and restore insulin signaling in Alzheimer's disease models.

GLP-1 drugs like liraglutide and exendin-4 show promise in animal studies for protecting the brain and improving memory in Alzheimer's. They work by activating pathways similar to insulin. While human trials are ongoing, these drugs might be a future treatment option for AD, especially if you have diabetes.

Daily oral administration of live Dysosmobacter welbionis J115T (1.0×10^9 CFU) prevents diet-induced obesity, reduces fat mass gain, and improves glucose tolerance in mice fed a high-fat diet.

In a mouse model, daily consumption of live Dysosmobacter welbionis J115T at a dose of 1 billion colony-forming units prevented weight gain and improved metabolic health during a high-fat diet. This effect was specific to live bacteria, as pasteurized versions were ineffective. This suggests that maintaining bacterial viability is critical for this specific strain's metabolic benefits.

Obesity and Type 2 Diabetes Mellitus in the elderly drive cardiovascular disease through chronic systemic inflammation, oxidative stress, and insulin resistance, leading to cardiac remodeling and fibrosis.

Managing weight and blood sugar is critical for heart health in older age because excess fat and high blood sugar trigger chronic inflammation that damages the heart muscle. Focus on a balanced diet and regular activity to reduce these inflammatory markers, as they are direct drivers of heart failure and artery disease.

Beetroot juice supplementation does not reliably improve cardiorespiratory endurance in hypoxic conditions (high altitude), and results are controversial.

Do not rely on beetroot juice to guarantee performance improvements when training or competing at high altitudes. The evidence is mixed, and it may not provide the expected ergogenic benefit in hypoxic environments.

Traditional herbal medicines (THM) including silymarin, berberine, resveratrol, and curcumin show hepatoprotective effects in preclinical models and some clinical trials for NAFLD/NASH, but robust, large-scale randomized controlled trials confirming efficacy for progressive NASH are currently lacking.

While traditional herbal medicines like silymarin, berberine, resveratrol, and curcumin show promise in laboratory studies and some early clinical trials for fatty liver disease, they are not yet proven cures for advanced NASH. Patients should not rely on them as a substitute for standard medical care or lifestyle changes without consulting a doctor, as evidence for their effectiveness in humans is still mixed and large-scale trials are ongoing.

Intermuscular adipose tissue (iMAT) in elderly men is primarily driven by total body fat mass and age, with subclinical local inflammation (IL-6 expression) contributing to its presence.

For older men, managing total body fat is the most effective way to reduce fat infiltration in muscles. While inflammation plays a role, it is local tissue inflammation that matters most, not necessarily what shows up in standard blood tests. Focus on maintaining a healthy weight and addressing age-related changes.

Nutrient excess activates the hexosamine biosynthesis pathway (HBP) and malonyl-CoA sensing, which directly cause insulin resistance and decreased energy expenditure (mitochondrial dysfunction) in peripheral tissues like skeletal muscle and adipose tissue.

To improve insulin sensitivity, you must reduce the nutrient flux that triggers these sensors. This means managing caloric intake and substrate availability (glucose and fatty acids) to prevent the activation of the hexosamine pathway and malonyl-CoA accumulation, which drive insulin resistance and reduce energy expenditure.

In the hypothalamus, nutrient sensing (specifically via malonyl-CoA and LCFA-CoA) triggers counterregulatory responses that decrease food intake and hepatic glucose production, acting as a negative feedback loop to peripheral insulin resistance.

Maintaining healthy levels of circulating nutrients helps preserve the brain's ability to sense energy status and regulate appetite. Chronic overfeeding can lead to central resistance, where the brain stops receiving the 'stop eating' signal.

Elevated levels of pro-inflammatory adipokines (e.g., leptin, resistin, chemerin, FABP4) and reduced levels of anti-inflammatory adipokines (e.g., adiponectin) drive chronic low-grade inflammation in adipose tissue during obesity, contributing to insulin resistance and metabolic disorders.

Obesity involves complex hormonal signaling from fat tissue that promotes inflammation and insulin resistance. While this review focuses on mechanisms rather than direct lifestyle advice, it underscores that metabolic health is influenced by the biochemical environment of fat tissue, not just energy balance. Targeting these inflammatory pathways (e.g., through weight loss or specific medical interventions) may help mitigate metabolic risks.

Leptin acts as a pro-inflammatory cytokine in adipose tissue by promoting macrophage infiltration and activation via JAK/STAT, MAPK, and PI3K pathways, contributing to local inflammation and lipid accumulation.

High levels of leptin in obesity do more than affect hunger; they actively promote inflammation in fat tissue by attracting and activating immune cells (macrophages). This inflammatory state contributes to insulin resistance and other metabolic issues.

Resistin promotes inflammation and insulin resistance by binding to TLR4 and activating NF-kB, JNK, and p38 MAPK pathways in macrophages and hypothalamic cells.

Resistin, a protein elevated in obesity, contributes to inflammation and insulin resistance by activating specific immune pathways (TLR4/NF-kB). This highlights the complex interplay between fat tissue, immune cells, and metabolic health.

Long non-coding RNAs (lncRNAs) regulate metabolic homeostasis, including glucose and energy balance, through mechanisms such as epigenetic modification, mRNA decay, and competing endogenous RNA (ceRNA) networks.

This paper highlights that non-coding RNAs play a crucial role in how your body manages energy and glucose. While there is no direct 'dosage' or intervention for a layperson, understanding this mechanism suggests that future therapies might target these RNA pathways to treat metabolic diseases like obesity and type 2 diabetes. For now, maintaining metabolic health through standard lifestyle interventions (diet and exercise) remains the primary strategy, as these may influence the expression of these regulatory RNAs.

Oral administration of gut microbe-derived extracellular vesicles (EVs), specifically from Pseudomonas panacis, induces insulin resistance and glucose intolerance in skeletal muscle and adipose tissue by blocking the insulin signaling pathway (specifically pAKT) and inhibiting GLUT4 translocation.

This research suggests that the type of bacteria in your gut and the vesicles they release can directly impact your insulin sensitivity. A diet high in fat may alter your gut microbiome to produce more of these specific vesicles (from P. panacis), which then travel to your muscles and fat tissue to block insulin signaling. While this is a mouse study, it implies that maintaining a diverse, healthy gut microbiome through diet (fiber, fermented foods) might help prevent the production of these insulin-blocking vesicles, thereby supporting better glucose metabolism.

A high-protein diet induces weight loss and reduced food intake in rodents primarily through leucine-mediated activation of hypothalamic mTOR and inhibition of AMPK, which shifts neuropeptide expression to favor satiety (increased POMC, decreased NPY).

To leverage the brain's satiety mechanisms, prioritize high-protein diets rich in leucine (found in whey, meat, eggs). This specific nutrient triggers hypothalamic mTOR activation, which suppresses hunger signals (NPY) and boosts satiety signals (POMC), leading to natural reductions in food intake and weight loss without conscious caloric restriction.

Exogenous leptin replacement in genetically leptin-deficient adults reduces brain activation in hunger-processing regions (insula, parietal, temporal cortex) and enhances activation in satiety/inhibition regions (prefrontal cortex) when exposed to high-calorie food cues.

For individuals with confirmed genetic leptin deficiency, daily subcutaneous leptin replacement at physiological doses can significantly reduce hunger cues and shift brain activity from hunger-processing areas to satiety/inhibition areas when exposed to food cues. This is not a general weight-loss solution for typical obesity but a targeted therapy for a specific genetic condition.

Small molecule activators of SIRT1 (SRT501 and SRT1720) replicate the molecular signaling pathways of calorie restriction in vivo, specifically by enhancing mitochondrial biogenesis, improving metabolic signaling, and blunting pro-inflammatory pathways.

This research suggests that specific compounds (SRT501, SRT1720) can mimic the metabolic benefits of calorie restriction, such as improved insulin sensitivity and reduced inflammation, in obese rodent models. While promising for treating Type 2 Diabetes, these are experimental drugs, not supplements. The findings highlight that activating SIRT1 is a key mechanism by which calorie restriction improves health, validating the biological importance of this pathway.

Leptin replacement therapy provides sustained beneficial metabolic effects in patients with generalised lipodystrophy by addressing low leptin levels and hyperphagia.

For individuals with generalised lipodystrophy, leptin replacement is a recommended treatment that can improve metabolic health.

Cold exposure activates the beta-3 adrenergic receptor system, leading to UCP1 upregulation and non-shivering thermogenesis, although human response varies significantly compared to rodents.

Cold exposure can activate brown fat via the beta-3 adrenergic system, but human response is highly variable and often weaker than in mice. While you can try cold showers or lower temperatures, do not rely on it as a primary weight loss strategy. Diet and exercise are more reliable and practical methods to increase metabolic rate.

The link between shift work and cancer (particularly breast, prostate, and colorectal) is less consistent and potentially confounded by lifestyle factors, with evidence suggesting a dose-response relationship with duration of exposure, especially for women.

For long-term shift workers, especially women, be aware of the potential increased cancer risk associated with night work. Mitigate this by minimizing light exposure during night shifts (use dim lights, blue-light blocking glasses) and maximizing darkness during daytime sleep. Regular health screenings are crucial.

Chronic activation of mTORC1 signaling in aging skeletal muscle leads to mitochondrial dysfunction, oxidative stress, and muscle senescence, resulting in sarcopenia rather than hypertrophy.

While stimulating muscle growth pathways like mTOR is essential for building muscle, doing so chronically without adequate recovery or in older age can backfire, leading to muscle loss and cellular aging. Focus on balanced training and nutrition that supports both synthesis and cellular cleanup (autophagy) rather than constant, maximal stimulation.

Pharmacological induction of autophagy by spermidine and resveratrol extends the lifespan of model organisms (yeast, nematodes, flies) and improves fitness in human cells, a process that is strictly dependent on the activation of autophagy pathways.

Current evidence supports that spermidine and resveratrol extend lifespan in model organisms by triggering autophagy. However, direct application to human longevity is not yet proven. Focus on maintaining cellular health through known autophagy inducers like exercise and fasting, which share mechanistic similarities.

Dietary supplementation with n-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) prevents the development of insulin resistance in rodent models fed high-fat or high-sucrose diets, but fails to reverse established insulin resistance in patients with type 2 diabetes.

If you are healthy, incorporating fish oil (EPA/DHA) into your diet may help maintain insulin sensitivity and reduce the insulin spike after eating carbohydrates. However, if you already have Type 2 Diabetes, fish oil supplementation is unlikely to reverse your insulin resistance or lower your blood sugar control metrics, despite its ability to lower triglycerides.