Browse the evidence

Combining clinical features (male sex, habitual snoring, supine sleep, heartburn, driving drowsiness, alcohol, BMI, age) with overnight oximetry allows confident diagnosis or exclusion of Obstructive Sleep Apnoea (OSA) in approximately one-third of patients, thereby reducing the need for full polysomnography.

If you have risk factors like male sex, high BMI, habitual snoring, or daytime drowsiness while driving, you are at higher risk for OSA. However, these symptoms alone are not enough to diagnose you. Combining these risk factors with a simple overnight oxygen saturation test (oximetry) can identify about one-third of cases accurately without needing a full, expensive sleep study (polysomnography). If your risk score is high but oximetry is inconclusive, full polysomnography is still required.

Habitual snoring occurring 'every night' is a significant predictor of OSA, whereas less frequent snoring is not, and daytime sleepiness (EDS) is only predictive when it manifests as dozing while driving.

Not all snoring or sleepiness indicates OSA. For snoring, it must be habitual (every night) to be a strong predictor. For daytime sleepiness, general tiredness is not predictive, but specifically dozing off while driving is a significant red flag for OSA.

Diagnosed diabetes is associated with significantly increased mortality risk from cardiovascular disease, chronic lower respiratory diseases, cerebrovascular disease, influenza/pneumonia, and kidney disease, but not from cancer, accidents, or Alzheimer's disease.

If you have diabetes, your primary focus for longevity should be protecting your heart and kidneys, as these are the conditions most strongly linked to increased mortality risk in diabetic patients. You do not need to assume your risk for cancer or Alzheimer's is higher than that of non-diabetics, though standard preventive care remains important. Prioritize cardiovascular health through blood pressure, lipid, and glucose management.

A high baseline Triglyceride-Glucose (TyG) index, calculated as ln[fasting triglycerides (mg/dL) * FPG (mg/dL) / 2], is a strong independent predictor of incident type 2 diabetes, with individuals in the highest quartile facing a >4-fold higher risk compared to the lowest quartile.

If you are concerned about your risk for type 2 diabetes, ask your doctor to calculate your TyG index using your fasting triglyceride and fasting glucose levels. This simple calculation is a more sensitive early warning system than standard glucose tests alone, especially if you have normal glucose levels but elevated triglycerides. A high result indicates higher insulin resistance and warrants lifestyle interventions to prevent diabetes.

In humans, severe calorie restriction does not reduce serum IGF-1 levels unless protein intake is also reduced, whereas in rodents, CR reduces IGF-1 without protein restriction.

If you are practicing calorie restriction and want to potentially lower IGF-1 (which may reduce cancer risk), consider moderately reducing your protein intake to around 0.75 g/kg body weight, rather than consuming high amounts of protein. This is a nuanced strategy that differs from standard fitness advice.

Changing dietary fatty acid composition from saturated to unsaturated (monounsaturated/polyunsaturated) does not significantly improve insulin sensitivity in healthy humans or those with NIDDM in short-term controlled trials.

Switching your fat sources (e.g., from butter to olive oil) is healthy for other reasons, but do not expect it to fix insulin resistance or lower blood sugar quickly. Current evidence suggests this change has little to no immediate effect on how your body handles insulin in healthy people or those with Type 2 Diabetes.

Exercise does not consistently increase skeletal muscle FNDC5 mRNA expression or serum irisin levels in healthy humans, and these markers do not correlate with metabolic health parameters.

Do not rely on measuring or targeting irisin/FNDC5 to gauge exercise effectiveness. Exercise provides significant health benefits regardless of whether these specific markers change, as they do not consistently respond to training in healthy individuals.

Serum irisin levels are not associated with glucose tolerance, insulin resistance (HOMA-IR), or metabolic disturbances in middle-aged men.

Do not use serum irisin levels as a diagnostic tool for metabolic health or glucose tolerance. The absence of a correlation means this marker is not useful for assessing insulin resistance in healthy middle-aged men.

Resistance exercise increases PGC-1α expression but does not consistently increase FNDC5 mRNA or serum irisin, suggesting PGC-1α is not the sole regulator of FNDC5.

Do not assume that increasing PGC-1α through exercise will automatically increase FNDC5 or irisin. The relationship is complex and not consistent across all populations.

Vitamin C and Vitamin E supplementation have limited ability to offset EIMD-induced decrements in muscle function and may even delay recovery.

Avoid high-dose Vitamin C and E supplements for muscle recovery. They do not improve muscle function and may actually slow down your recovery process.

Activation of PPARα induces PGC-1α gene expression in brown adipose tissue, thereby contributing to thermogenic activation and the browning of white adipocytes.

This research identifies PPARα as a key regulator that can turn white fat cells into thermogenic brown-like cells by boosting PGC-1α. While this paper uses specific agonists (like Wy14,643) in a lab setting, it suggests that strategies enhancing PPARα activity (such as cold exposure or specific dietary fatty acids known to activate PPARα) may promote fat burning and metabolic health by activating this molecular pathway.

Higher urinary bisphenol A (uBPA) concentrations are associated with increased odds of diabetes, obesity, elevated waist circumference, and hypertension in humans.

Reduce exposure to Bisphenol A (BPA) by avoiding heating food in plastic containers, choosing BPA-free products, and limiting canned food consumption, as higher urinary BPA levels are linked to higher risks of diabetes, obesity, and hypertension.

Acute intranasal insulin administration improves hippocampus-dependent memory and working memory in women, but not in men.

If you are a healthy woman, acute intranasal insulin may help improve your memory, but this effect does not appear to exist for men. This suggests that treatments targeting central insulin signaling for cognitive enhancement may need to account for gender-specific biological responses.

Rising income and urbanization in developing countries drive a nutrition transition characterized by increased fat and meat consumption, reduced physical activity, and a rapid rise in obesity and adult-onset diabetes.

In rapidly developing economies, obesity is not just a personal failure but a result of changing food environments (more fat/meat, less fiber) and lifestyle (sedentary work). Public health interventions should focus on environmental factors like food pricing and urban planning rather than just individual education.

Insulin acts as an anorexigenic signal in the CNS by binding to insulin receptors in the hypothalamus, activating PI3K signaling to inhibit NPY and stimulate POMC, thereby reducing food intake.

Insulin does more than manage blood sugar; it signals your brain that you have enough energy. High insulin levels (common in obesity) can lead to central insulin resistance, blunting this satiety signal. Improving insulin sensitivity through diet and exercise may help restore this natural appetite regulation.

PYY3-36, released from intestinal L-cells after meals, acts as an anorexigenic signal by inhibiting ARC Y2 receptors, leading to increased alpha-MSH and reduced NPY release, thereby reducing appetite.

PYY3-36 is a hormone released by your gut after eating that helps signal fullness to your brain. It works by inhibiting hunger signals (NPY) and promoting satiety signals (alpha-MSH). Diets rich in protein and fiber may naturally boost PYY release, aiding satiety.

Chronic calcium deficiency resulting from inadequate intake or poor absorption causes reduced bone mass and osteoporosis by triggering parathyroid hormone (PTH)-mediated bone resorption.

Ensure you get enough calcium from food sources like dairy or fortified foods, especially if you are postmenopausal or an adolescent, because chronic low intake triggers hormonal processes that break down bone. If you cannot meet intake goals, consider calcium-fortified foods or supplements, but be aware that absorption varies and may not fully prevent bone loss in all groups.

Post-exercise amino acid availability is less effective than insulin at inhibiting muscle protein breakdown (MPB); insulin secretion is primarily stimulated by glucose availability.

To maximize muscle retention after a workout, don't just rely on protein. Consuming carbohydrates alongside protein stimulates insulin, which is highly effective at suppressing muscle breakdown (MPB), potentially more so than amino acids alone in this specific context.

Dietary restriction (DR), including caloric restriction and intermittent fasting, extends lifespan and protects against neurodegenerative diseases (Alzheimer's, Parkinson's, stroke) by inducing a cellular stress response that upregulates neurotrophic factors (BDNF) and protein chaperones (HSP-70).

Adopting dietary restriction through caloric reduction or intermittent fasting can trigger biological mechanisms that protect the brain against aging and neurodegenerative diseases. This is achieved by increasing the production of protective proteins like BDNF and heat-shock proteins. While animal studies show robust protection, human application should focus on sustainable patterns of reduced intake or fasting windows, acknowledging that individual responses may vary.

Dietary restriction stimulates neurogenesis (the generation of new neurons) in the adult hippocampus, primarily by enhancing the survival of newly generated cells via BDNF, rather than increasing the proliferation rate of stem cells.

Fasting or caloric restriction helps the brain create and keep new neurons in the hippocampus, which is linked to better memory and learning. This happens because the new neurons are more likely to survive, not because they are created faster. This benefit depends on having normal levels of BDNF.

Physical inactivity in Arab countries is associated with specific socio-demographic factors, including older age, marriage, urban residence, and lower education levels.

Be aware that your age, marital status, place of residence, education, and employment can influence your physical activity levels. Older, married, urban-dwelling individuals with lower education may face higher barriers to activity. Leverage employment and education to maintain active habits.

In advanced solid tumor cancer patients, weight loss is driven primarily by elevated resting energy expenditure (hypermetabolism) rather than reduced dietary intake, as energy intake does not increase to compensate for higher metabolic rates.

For cancer patients with solid tumors, simply encouraging them to eat more may fail because their bodies are burning energy at an abnormally high rate (hypermetabolism) that standard intake cannot match. The focus should be on managing metabolic expenditure or providing high-density nutritional support that exceeds this elevated baseline, rather than assuming the patient is simply refusing to eat.

Overexpression of TORC family proteins (TORC1, TORC2, TORC3) induces PGC-1α transcription and mitochondrial biogenesis in muscle cells, leading to increased mitochondrial oxidative capacity and fatty acid oxidation.

This research identifies TORC proteins as key switches that turn on mitochondrial growth in muscle. While you cannot directly 'dose' TORC, this mechanism explains why activities that trigger calcium and cAMP signaling (like exercise and cold exposure) are effective at building mitochondrial density. To leverage this, engage in regular physical activity and consider cold exposure, as these stimuli activate the TORC-PGC-1α pathway.

Gut microbiome composition, specifically the ratio of Firmicutes to Bacteroidetes and the presence of Akkermansia muciniphila, influences obesity and diabetes risk through mechanisms involving short-chain fatty acid production, bile acid metabolism, and gut permeability.

Focus on a diet that supports a healthy gut microbiome, including fiber and diverse plant foods, as this influences the ratio of beneficial bacteria. While probiotics show some promise, they are not a standalone solution for obesity or diabetes.