Browse the evidence

Gut microbes influence host metabolism and adiposity through signaling pathways involving inflammation (LPS), insulin resistance, and endocrine hormones (GLP-1, GLP-2, PYY).

Your gut bacteria produce substances that signal your brain and body to store fat or become inflamed. A high-fat diet can increase these harmful signals (like LPS), while a diet rich in fiber may support beneficial bacteria that produce hormones (like GLP-1) promoting satiety and metabolic health.

Elevated circulating levels of branched-chain amino acids (BCAAs) are associated with an increased risk of insulin resistance (IR) and type 2 diabetes mellitus (T2DM), acting as biomarkers for these metabolic conditions.

If you are concerned about insulin resistance or type 2 diabetes, simply taking BCAA supplements may not help and could potentially reflect or exacerbate underlying metabolic issues. Focus on overall metabolic health, including diet quality and physical activity, rather than isolated BCAA supplementation, especially if you have obesity or pre-diabetic conditions.

BCAAs, particularly leucine, stimulate muscle protein synthesis via the mTOR signaling pathway, but this effect may be blunted or associated with insulin resistance if circulating BCAA levels are chronically elevated.

BCAAs, especially leucine, do stimulate muscle protein synthesis through the mTOR pathway. However, if you have insulin resistance or obesity, chronically high BCAA levels might contribute to metabolic issues. Focus on a balanced diet and exercise rather than relying solely on BCAA supplements for muscle growth.

Long-term adherence to CPAP therapy is associated with a significantly lower risk of developing new-onset hypertension compared to having untreated obstructive sleep apnea (OSA) or no OSA.

If you have Obstructive Sleep Apnea, using CPAP therapy consistently (more than 4 hours per night) is associated with a lower risk of developing high blood pressure over the long term compared to not treating it. While CPAP can be uncomfortable, adherence is key to reducing this cardiovascular risk.

Hypertension is independently associated with an increased prevalence of new diabetes in both men and women, acting as a significant risk factor alongside obesity.

If you have high blood pressure, be aware that your risk of developing diabetes is higher. Regular monitoring of blood sugar levels is recommended to catch any changes early. Managing both conditions through lifestyle and medication is key to long-term health.

Subcutaneous truncal fat is the primary driver of obesity-related insulin resistance in men, whereas intraperitoneal and retroperitoneal fat have a significantly lesser role.

For men, where you store fat matters for insulin sensitivity. Subcutaneous fat in the trunk (abdomen) is a stronger predictor of insulin resistance than visceral (intraperitoneal) or retroperitoneal fat. Focus on reducing overall body fat, as this will likely reduce the metabolically active subcutaneous truncal fat, thereby improving insulin sensitivity.

High-dose niacin (1,500 mg/day) improves the atherogenic lipoprotein profile in type 2 diabetes but may worsen glycemic control, whereas lower doses (1,000 mg/day) have minimal impact on glycemia.

If your doctor prescribes Niacin for your cholesterol, be aware that higher doses might raise your blood sugar levels. Lower doses (1,000mg) seem to have less impact on blood sugar control. Monitor your glucose closely, especially if you are on higher doses, and report any changes to your doctor.

Chronic insomnia combined with objectively measured short sleep duration (≤5 hours) significantly increases the risk of hypertension, whereas insomnia with normal sleep duration (>6 hours) does not.

If you have chronic insomnia, do not rely on how you feel about your sleep. Get an objective measure of your sleep duration (e.g., via actigraphy or sleep study). If you are sleeping less than 5 hours, your risk for high blood pressure is significantly elevated. This risk is not present if you sleep more than 6 hours despite the complaint. Treat this as a medical risk factor, not just a quality-of-life issue.

Type 2 diabetes in older adults is associated with significantly lower skeletal muscle quality (strength per unit mass) and strength, independent of muscle mass, with effects worsening as diabetes duration and glycemic control worsen.

If you have Type 2 Diabetes, maintaining muscle mass alone may not protect your physical function. Focus on resistance training to improve muscle quality (strength relative to mass), as poor glycemic control and long duration of diabetes are linked to lower muscle quality. Regular strength training may help mitigate this risk.

Intermittent fasting improves cardiometabolic risk factors, including insulin resistance, dyslipidemia, and inflammation, by triggering the metabolic switch.

Fasting can help fix metabolic issues like high blood sugar and bad cholesterol. By not eating for 12+ hours, your body switches to burning fat, which reduces inflammation and improves how your body handles insulin.

Fructose metabolism generates uric acid, which causes mitochondrial oxidative stress and inhibits AMPK, leading to hepatic fat accumulation and insulin resistance independent of caloric excess.

Prioritize reducing added sugars (soda, HFCS, sucrose) over total calorie counting for metabolic health. The biochemical pathway of fructose metabolism creates uric acid, which drives insulin resistance and fatty liver. You do not need to avoid natural whole fruits, as they contain protective nutrients that mitigate these effects. Focus on the source of sugar, not just the calories.

Early postmenopausal hormone replacement therapy (HRT) significantly reduces the risk of mortality, myocardial infarction, or heart failure compared to no treatment, without increasing the risk of stroke, venous thromboembolism, or cancer.

For recently postmenopausal women, starting hormone replacement therapy early (within a few years of menopause) can significantly lower the risk of heart attacks, heart failure, and death, without increasing the risk of stroke, blood clots, or cancer. This benefit was observed in women with or without a uterus, using standard hormonal regimens. Women considering HRT should discuss the timing and type of therapy with their healthcare provider, as starting early seems to be key to cardiovascular benefit.

Consumption of excess fructose-containing sugars (sucrose or HFCS) promotes cardiovascular disease and type 2 diabetes risk through direct metabolic pathways, specifically by causing hepatic lipid accumulation, dyslipidemia, and insulin resistance independent of body weight gain.

If you consume high amounts of added sugars (especially those containing fructose like HFCS or sucrose), you may be increasing your risk for heart disease and diabetes through direct metabolic stress on your liver, even if your weight stays the same. Reducing added sugars can lower this specific metabolic risk.

Vitamin D supplementation (700–1000 IU/day) reduces the risk of falls by 19-23% in adults, but only when serum 25(OH)D levels reach at least 24 ng/mL.

Take 700-1000 IU of Vitamin D daily to reduce fall risk. This works by improving muscle strength and balance, but only if your blood levels reach at least 24 ng/mL. If you are taking lower doses, you may not get this specific benefit.

Whey protein induces greater satiety and reduces subsequent food intake compared to casein due to faster gastric emptying, leading to higher postprandial plasma amino acid, CCK, and GLP-1 concentrations.

If you want to feel fuller and eat less at your next meal, choose whey protein over casein. Whey digests faster, causing a quicker spike in satiety hormones (CCK and GLP-1) and blood amino acids. This 'fast' protein effect can help you naturally reduce your calorie intake at subsequent meals compared to 'slow' proteins like casein.

SGLT2 inhibitors (e.g., Dapagliflozin, Ipragliflozin) and GLP-1 agonists (e.g., Exenatide) improve endothelial function in T2DM patients, independent of or beyond their glucose-lowering effects.

If you have T2DM, ask your doctor about SGLT2 inhibitors or GLP-1 agonists. These drugs not only lower blood sugar but also directly protect your blood vessels and heart, improving how your arteries expand and contract.

Time-restricted feeding significantly reduces circulating testosterone and IGF-1 levels in resistance-trained males, although this hormonal reduction does not translate to muscle loss or strength deficits in this specific population.

Monitor your strength and body composition, not just blood work. If your TRF protocol lowers your testosterone and IGF-1 but you are still getting stronger and keeping your muscle, the hormonal drop is likely not functionally limiting for you. Do not change your diet based on hormone numbers alone if your performance is stable.

In patients with high triglycerides or metabolic syndrome, non-HDL cholesterol is a superior predictor of cardiovascular risk and a valid secondary treatment target compared to LDL cholesterol alone.

If you have high triglycerides or metabolic syndrome, ask your doctor to check your non-HDL cholesterol. It gives a more accurate picture of your heart disease risk than LDL alone and is calculated from your standard lipid panel without extra cost.

Adiponectin levels are inversely associated with obesity and insulin resistance, and low plasma adiponectin is a risk factor for type 2 diabetes, suggesting that boosting adiponectin could be therapeutic.

Maintaining higher levels of adiponectin is protective against diabetes. Since adiponectin levels drop with obesity, strategies that improve metabolic health (like exercise and weight loss) naturally help restore these levels. There are no approved adiponectin supplements, but lifestyle interventions that boost its activity are beneficial.

Exercise-induced weight loss improves insulin sensitivity in obese women, whereas diet-induced weight loss alone does not significantly improve insulin sensitivity in this population.

To improve your insulin sensitivity, you must exercise. Simply losing weight through dieting may not be enough to fix your metabolic health. Exercise-induced weight loss is required to significantly improve how your body handles insulin.

Higher levels of objectively measured physical activity are causally associated with a significantly lower risk of developing breast and colorectal cancers.

To lower your risk of breast and colorectal cancer, focus on increasing your daily movement rather than intense, time-consuming workouts. The research indicates that a modest increase in average daily acceleration—equivalent to adding about 50 minutes of moderate activity (like brisk walking) or 8 minutes of vigorous activity (like running) per week—is causally linked to significantly lower cancer risks. This benefit appears to be independent of weight loss, suggesting that the act of moving itself triggers protective biological mechanisms.

Chronic elevation of the myokine IL-6 in obesity contributes to insulin resistance, contrasting with its acute anti-inflammatory and insulin-sensitizing effects during exercise.

Don't fear all inflammation. Acute spikes in IL-6 from exercise improve insulin sensitivity. However, chronic high levels of IL-6 associated with obesity contribute to insulin resistance. Focus on reducing chronic inflammation through weight management.

Exercise improves mental health and cognitive function through mechanisms involving BDNF, IGF-1, and myokines like FNDC5 and PGC-1α, which promote neurogenesis and synaptic plasticity.

Regular exercise boosts brain-derived neurotrophic factor (BDNF) and other growth factors that support brain health and reduce the risk of depression. Make exercise a regular part of your routine to support your mental well-being.

Exercise improves glucose tolerance and insulin sensitivity through mechanisms independent of the insulin receptor, bypassing insulin resistance in type 2 diabetes.

If you have type 2 diabetes or are at risk, exercise helps your muscles take up glucose without relying on insulin. This bypasses the resistance that makes medication less effective. Combine exercise with other lifestyle changes for the best results.