Browse the evidence

Exercise-induced skeletal muscle secretion of IL-6 mediates metabolic crosstalk, specifically enhancing glucose uptake and fatty acid oxidation within muscle and stimulating hepatic glucose production during exercise.

Regular exercise triggers your muscles to release IL-6, which helps your muscles use more glucose and fat for energy and signals your liver to release glucose when needed. This hormonal communication is a key reason why exercise improves metabolic health beyond just burning calories.

Exercise-induced secretion of myokines like IL-6, BDNF, Cathepsin B, and Irisin mediates muscle-brain crosstalk, promoting hippocampal neurogenesis, cognitive function, and potentially protecting against neurodegenerative diseases.

Exercise helps your brain by releasing factors like BDNF and Cathepsin B that support new neuron growth and cognitive function. This is particularly important for maintaining mental sharpness and potentially reducing the risk of dementia as you age.

Exercise-induced myokines, particularly IL-6, mediate muscle-adipose crosstalk by promoting lipolysis, fat oxidation, and potentially the browning of white adipose tissue, thereby reducing visceral adiposity.

Exercise helps you lose fat by triggering your muscles to release IL-6, which directly stimulates fat breakdown and oxidation. This hormonal signal is crucial for reducing visceral fat, especially when combined with a healthy diet.

Genetic variants near the NKX6.3 gene (specifically rs6981587) are associated with the degree of weight loss in response to low-caloric diet interventions, with the major C allele linked to decreased weight loss efficacy.

If you are struggling with weight loss despite strict adherence to a low-calorie diet, genetic factors near the NKX6.3 gene may be influencing your response. This is not a failure of willpower but a biological variance. Consider genetic counseling or personalized nutrition approaches that account for this variability, rather than assuming standard protocols will work identically for everyone.

Low-GI diets are associated with modest to clinically important benefits for cardiovascular disease (CVD) risk factors and diabetes management, including lower total cholesterol and improved glycemic control.

Prioritize foods with a lower Glycemic Index (GI) to help manage blood sugar and cholesterol levels. This is particularly beneficial for individuals with diabetes or those at risk for heart disease.

Ghrelin levels are inversely correlated with body fat mass, being suppressed in obesity and elevated in states of negative energy balance such as anorexia nervosa or low-calorie diets.

Your body produces less of the 'hunger hormone' (ghrelin) when you are obese, likely as a response to high caloric intake. However, this does not mean you are immune to hunger. When you lose weight, ghrelin levels rise, which may increase your appetite as your body tries to regain weight.

Adiponectin levels are negatively correlated with obesity and insulin resistance, and low levels are associated with an increased risk of type II diabetes and cardiovascular disease.

Low levels of adiponectin, an hormone produced by fat cells, are a strong indicator of insulin resistance and higher risk for type II diabetes. Losing weight and exercising can naturally increase your adiponectin levels, improving your metabolic health.

Abdominal obesity, measured by waist circumference and waist-to-hip ratio, is a strong independent risk factor for colon cancer and large adenomas, increasing risk even after adjusting for overall body mass index and physical activity levels.

Monitor your waist size and waist-to-hip ratio, not just your weight. Abdominal fat is a strong independent risk factor for colon cancer. Maintaining a healthy waist circumference (e.g., <35 inches for men in this study's reference group) and reducing abdominal adiposity through lifestyle changes can significantly lower your risk.

Exercise training improves endothelium-derived nitric oxide (NO) function in humans, with the magnitude of improvement depending on the muscle mass trained and the presence of pre-existing endothelial dysfunction.

To improve your vascular health through exercise, prioritize large muscle group activities like cycling or running. These create systemic shear stress that boosts nitric oxide function throughout your body, even in areas you aren't directly exercising. If you have existing heart risk factors, this benefit is particularly pronounced.

Exercise training improves endothelial function primarily by increasing nitric oxide bioactivity, which counteracts oxygen free radicals and upregulates eNOS expression, leading to structural arterial remodeling over the long term.

Consistent exercise helps your blood vessels produce more nitric oxide, which protects them from damage by free radicals. Over time, this not only improves blood flow but can physically remodel arteries to be healthier, especially if you have existing cardiovascular risks.

Restricting sleep duration to 4 hours per night for 6 days significantly decreases circulating leptin levels (mean -19%, maximal -26%) and reduces the amplitude of the diurnal leptin rhythm compared to extended sleep (12 hours).

If you consistently sleep less than 7-8 hours, your body produces less leptin, the hormone that signals fullness. This happens even if you don't change your diet. To manage appetite and prevent overeating, prioritize getting 8 hours of sleep as rigorously as you prioritize your food choices.

Sleep restriction (4 hours/night) impairs glucose tolerance and increases post-breakfast insulin resistance, as measured by elevated HOMA values, despite similar insulin levels to rested conditions.

Sleeping only 4 hours makes your body handle carbohydrates poorly the next morning, leading to higher blood sugar spikes. This happens even if you eat the same amount of food. Prioritize sleep to maintain good glucose tolerance.

Aerobic endurance training reduces blood pressure by decreasing systemic vascular resistance, mediated by reductions in sympathetic nervous system activity (plasma norepinephrine) and renin-angiotensin system activity (plasma renin activity).

Your body adapts to regular aerobic exercise by relaxing your blood vessels and calming the hormonal systems that constrict them. This biological change is what lowers your blood pressure over time, not just immediate blood flow changes during exercise.

Subcutaneous abdominal fat is a stronger predictor of insulin resistance than visceral fat and retains independent significance after adjusting for visceral fat.

Don't just measure your waistline. If you are carrying weight, where it sits matters. Subcutaneous fat (the soft fat under the skin) is a major driver of insulin resistance, potentially more so than deep visceral fat. Focus on overall body composition and muscle health rather than just trying to shrink your waist circumference, as muscle quality (attenuation) is also a key independent factor.

Obstructive sleep apnoea syndrome (OSAS) is an independent risk factor for systemic arterial hypertension, with CPAP treatment effectively lowering blood pressure in hypertensive patients.

If you have sleep apnoea, treating it with CPAP is crucial for preventing high blood pressure, even if you don't feel excessively sleepy during the day. Consistent nightly use is key to lowering blood pressure and reducing long-term heart risks.

Autophagy is a double-edged sword in muscle health: it is essential for removing damaged components and preventing degeneration, but its hyperactivation contributes to muscle loss in pathological conditions.

Autophagy is your muscle's recycling system. It is essential for removing damaged parts and maintaining health. However, in states of severe stress or disease, this system can become overactive and break down muscle faster than it can be replaced. Balancing this system is key to maintaining muscle mass.

Consuming approximately one fatty fish meal per week (approx. 5.5g n-3 fatty acids/month) is associated with a 50% reduction in the risk of primary cardiac arrest compared to no seafood intake.

To potentially lower your risk of primary cardiac arrest, aim to eat one serving of fatty fish (like salmon or mackerel) per week. This provides about 5.5 grams of n-3 fatty acids monthly, which the study links to a 50% lower risk compared to not eating seafood. This applies to healthy adults without prior heart disease.

Higher red blood cell membrane levels of n-3 polyunsaturated fatty acids (specifically 5.0% of total fatty acids) are associated with a 70% reduction in the risk of primary cardiac arrest compared to lower levels (3.3%).

Maintaining higher levels of n-3 fatty acids in your red blood cell membranes (around 5.0% of total fatty acids) is associated with a significantly lower risk of primary cardiac arrest. This biomarker reflects consistent dietary intake of fatty fish.

Testosterone replacement therapy (200 mg testosterone cypionate biweekly) significantly improves upper body strength (grip strength) in older hypogonadal men over a 12-month period.

If you are an older man with clinically low testosterone, testosterone replacement therapy can significantly improve your hand grip strength, which is a key indicator of physical function and frailty. This benefit was observed over a year of treatment. However, you must be monitored for side effects like high red blood cell counts.

Testosterone replacement therapy increases hemoglobin and hematocrit levels in older hypogonadal men, requiring monitoring for polycythemia.

Testosterone therapy will increase your red blood cell count (hemoglobin). This is a known effect. You need regular blood tests to monitor this. If your levels get too high, your doctor may need to adjust your dose or perform phlebotomy (blood removal) to keep you safe.

Adult growth hormone deficiency (GHD) causes low bone turnover osteoporosis with a high risk of vertebral and nonvertebral fractures, but this low bone mass can be partially reversed by GH replacement therapy.

If you have been diagnosed with adult Growth Hormone Deficiency, GH replacement therapy is a valid medical intervention to help reverse low bone mass and reduce your risk of fractures. Consult an endocrinologist to determine if you are a candidate.

Estimated sodium excretion between 3.00 and 6.00 g per day is associated with the lowest risk of death and major cardiovascular events, whereas both higher (≥7.00 g/day) and lower (<3.00 g/day) intakes are associated with increased risk.

For cardiovascular health, aim for a moderate sodium intake (estimated 3-6 g/day) rather than extreme restriction or excess. Both very low and very high sodium levels are linked to higher risks of death and heart events. If you have hypertension, be particularly mindful not to exceed 6 g/day.

Non-fasting (postprandial) triglyceride levels are a significant and often neglected risk factor for premature ASCVD, as the postprandial state is the norm for most of the day and involves the accumulation of atherogenic remnant particles.

Your heart disease risk is not just determined by how you feel after an overnight fast. The hours after you eat, when fat particles are circulating, contribute significantly to plaque buildup. If you have high triglycerides, your non-fasting levels are likely even higher and more dangerous.

GLP-1 receptor agonists promote long-term weight loss by reducing appetite and food intake, primarily through effects on the hypothalamus.

GLP-1 receptor agonists help with weight loss by reducing hunger and the amount of food consumed. This effect is mediated by the brain's hypothalamus. Patients may experience reduced appetite as a primary mechanism for weight management.