Browse the evidence

Liraglutide (1.8–3.0 mg) reduces ad libitum energy intake by approximately 16% and increases postprandial satiety in obese, non-diabetic adults, mediating weight loss through appetite suppression rather than increased energy expenditure.

For obese adults without diabetes, taking liraglutide (1.8 or 3.0 mg) once daily significantly reduces hunger and the amount of food eaten at meals (by about 16%) without needing to change exercise habits. This appetite suppression is the main reason for weight loss, not burning more calories. To minimize nausea, the dose should be started low and increased gradually.

Reducing the dietary omega-6 to omega-3 fatty acid ratio from typical Western levels (15:1) to 4:1 or lower significantly reduces total mortality and cardiovascular disease risk.

To lower your risk of heart disease and total mortality, change your cooking oils. Replace corn, soybean, or sunflower oils (high in omega-6) with olive oil and canola oil (higher in omega-3). Aim for a ratio of 4 parts omega-6 to 1 part omega-3. This involves eating more plants, nuts, and legumes while reducing processed foods high in seed oils.

A lower omega-6 to omega-3 ratio (2-3:1) suppresses inflammation in patients with rheumatoid arthritis, and a ratio of 5:1 has a beneficial effect on asthma.

For inflammatory conditions like rheumatoid arthritis or asthma, aim for a lower omega-6 to omega-3 ratio (2-5:1). This involves reducing seed oils and increasing omega-3 sources (fish, flax, walnuts). High omega-6 ratios (10:1) may worsen symptoms.

Viscous soluble dietary fibers (SDF) such as beta-glucan, pectin, and psyllium reduce serum total and LDL cholesterol by preventing bile salt re-absorption in the small intestine, which forces the liver to synthesize new bile acids from cholesterol.

To lower cholesterol, prioritize viscous soluble fibers like oat beta-glucan (3g/day) or psyllium husk (7g/day). These fibers must be viscous to physically bind bile acids in your gut, forcing your liver to use blood cholesterol to make more bile. Non-viscous fibers do not offer this specific benefit.

Exposure to shift work, particularly rotating shifts, is associated with a statistically significant increase in the risk of developing diabetes mellitus compared to normal daytime work schedules.

If you work shifts, especially rotating ones, your risk for type 2 diabetes is higher than day workers. This is likely due to disrupted sleep and circadian rhythms affecting how your body handles sugar. Prioritize sleep quality, maintain a healthy weight, and discuss your shift schedule with your doctor to monitor blood sugar levels proactively.

The increased risk of diabetes mellitus associated with shift work is significantly higher in men than in women, and highest in those working rotating shifts.

If you are a man working rotating shifts, your risk for diabetes is significantly higher than other groups. This may be linked to how shift work affects your hormones and sleep. Prioritize regular health screenings for blood sugar and discuss your specific schedule with your healthcare provider to implement targeted preventive measures.

Short sleep duration (defined as <8 hours in adults or age-appropriate norms in children) causes obesity by altering metabolic hormones (lowering leptin, raising ghrelin) and increasing appetite for energy-dense foods, while also reducing physical activity due to fatigue.

Prioritize getting adequate sleep (8+ hours for adults, age-appropriate for children) as a primary strategy for weight management. This is not just about feeling rested; lack of sleep biologically increases your hunger hormones and decreases your fullness hormones, making you crave more food, especially high-calorie options. Combine this with good sleep hygiene (no screens in bed, consistent schedule) to support your weight loss efforts.

Increasing vitamin D intake from 100 IU to 500 IU daily reduces late wintertime spinal bone loss and improves net spinal bone density in healthy postmenopausal women consuming approximately 800 mg of calcium daily.

If you are a postmenopausal woman, ensure you are getting about 500 IU of Vitamin D daily, especially during winter months. This is particularly important if you are also taking calcium supplements (around 800mg total daily). This combination helps prevent the specific bone loss that happens when sunlight is scarce.

Insulin resistance (IR) is a central pathophysiological mechanism that drives the development and progression of multiple metabolic diseases, including type 2 diabetes, cardiovascular disease, nonalcoholic fatty liver disease (NAFLD), and certain cancers.

Insulin resistance is not just a blood sugar issue; it is a systemic driver of chronic disease. Addressing it through lifestyle changes (exercise, diet) or medications (like metformin or GLP-1 agonists) can potentially improve multiple health outcomes at once, including heart health, liver health, and diabetes management. Prioritizing insulin sensitivity is a high-leverage strategy for overall metabolic health.

Obesity, particularly central/visceral obesity, is a primary cause of insulin resistance through mechanisms involving increased free fatty acids, chronic inflammation, and adipokine dysregulation.

Losing even a modest amount of weight (e.g., 10% of body weight) can significantly improve insulin sensitivity, especially if the weight is visceral fat. Focus on reducing abdominal fat through caloric deficit and exercise, as this directly addresses the root cause of obesity-induced insulin resistance.

Chronic low-grade inflammation, driven by obesity and characterized by elevated pro-inflammatory cytokines (TNF-alpha, IL-6, CRP), directly interferes with insulin signaling pathways, contributing to insulin resistance.

Chronic low-grade inflammation, common in obesity, disrupts insulin signaling. Anti-inflammatory lifestyle strategies (e.g., Mediterranean diet, regular exercise, stress management) can help reduce this inflammation and improve insulin sensitivity.

Fasting (1-5 days) significantly increases growth hormone (GH) secretion in humans by increasing both pulse frequency and amplitude, and reveals underlying ultradian and circadian rhythmicity that is masked in the fed state.

If you fast for 1-5 days, your body significantly increases Growth Hormone output. This isn't just random; it reveals hidden daily (circadian) and shorter (ultradian) rhythms. This hormonal shift helps your body switch from burning sugar to burning fat, which helps preserve muscle mass during the fast. However, note that while GH goes up, the actual growth factor (IGF-1/SmC) goes down, so fasting is for metabolic flexibility, not building new muscle tissue.

Visceral obesity is not merely a distribution of fat but a distinct metabolic syndrome driven by neuroendocrine dysregulation (specifically heightened hypothalamo-adrenal sensitivity and blunted sex steroids/GH), which directly causes insulin resistance, hypertension, and cardiovascular disease risk.

Stop focusing only on total body weight. Measure your waist and hip circumference. If your waist is large relative to your hips, you are at high risk for diabetes and heart disease, even if you are not 'obese' by BMI standards. This risk is driven by stress, inactivity, and hormonal imbalances, not just calories. Prioritize stress management, smoking cessation, and alcohol reduction alongside exercise to target visceral fat specifically.

Food intake stimulates insulin release and mTOR-dependent protein synthesis in muscle, while excess amino acids are oxidized leading to increased urea production.

After eating, your body uses amino acids to build muscle (via mTOR and insulin) and oxidizes any excess for energy, producing urea. This highlights that protein has a limit to how much can be used for synthesis at once.

Gut microbiota metabolize dietary choline and carnitine into trimethylamine (TMA), which is converted to trimethylamine N-oxide (TMAO) in the liver; elevated TMAO levels are associated with increased risk of cardiovascular disease (CVD) and chronic kidney disease (CKD).

Your gut bacteria convert nutrients from eggs and red meat into a compound (TMAO) linked to heart and kidney disease. This risk depends on your specific gut bacteria. While you don't need to avoid these foods entirely, maintaining a diverse gut microbiome through fiber may help manage TMAO levels.

Short-chain fatty acids (SCFAs) produced by gut microbiota improve glucose homeostasis and insulin sensitivity by activating receptors like FFAR2/GPR43 and PPARγ.

Eat fiber-rich foods (vegetables, whole grains) to feed your gut bacteria. They will produce SCFAs like butyrate, which signal your body to improve insulin sensitivity and glucose control.

Exercise-induced increases in arterial shear stress are the principal physiological stimulus for improving flow-mediated endothelial function and resistance artery remodeling in humans.

To improve your blood vessel health, you need exercises that create high blood flow and shear stress, not just those that build muscle size. High-intensity dynamic exercises (like running, cycling, or high-rep resistance training) are likely more effective for vascular adaptation than low-flow static exercises (like heavy isometric holds) because they generate the necessary shear stress stimulus.

Endurance training increases skeletal muscle lipid utilization during submaximal exercise by upregulating fatty acid transport proteins (FAT/CD36 and FABPpm) and enhancing intramyocellular triacylglycerol (IMTG) oxidation, thereby improving metabolic flexibility.

To improve your body's ability to burn fat during exercise, focus on consistent endurance training at moderate intensities. This training upregulates the proteins responsible for moving fatty acids into muscle cells and burning them, making you more metabolically flexible. You do not need to follow extreme low-carb diets to achieve this; regular training is the primary driver.

Obesity (BMI ≥30 kg/m²) significantly impairs female fecundity and increases the risk of miscarriage through hormonal perturbations (elevated leptin, insulin resistance, altered SHBG) and direct effects on oocyte quality and endometrial receptivity.

If you have a BMI over 30, your risk of infertility and miscarriage is significantly higher due to hormonal imbalances like high leptin and insulin resistance. However, this is not permanent. Losing weight, even modestly (5% or more), can restore normal ovulation and significantly improve your chances of conceiving naturally or through assisted reproduction. Consult a specialist for a weight management plan tailored to fertility.

Patients with type 2 diabetes lose approximately half the weight achieved by non-diabetic patients through dietary counseling, and studies excluding diabetic patients report greater net weight loss.

If you have type 2 diabetes, expect to lose about half as much weight as a non-diabetic person following the same dietary counseling program. This is a known physiological difference, not a failure on your part. Focus on the health benefits of even modest weight loss.

Intravenous administration of exendin-4 (0.05 pmol/kg/min) significantly reduces fasting and postprandial plasma glucose levels and decreases caloric intake by 19% in healthy volunteers without causing nausea.

Exendin-4, a GLP-1 receptor agonist, significantly lowers blood glucose and reduces calorie intake in healthy individuals without causing nausea at the tested dose. It works by delaying gastric emptying and reducing hunger, offering a potential treatment for type 2 diabetes and obesity.

A higher Triglyceride-Glucose (TyG) index is independently associated with an increased incidence of atherosclerotic cardiovascular diseases (ASCVD), coronary artery disease (CAD), and stroke in individuals without baseline ASCVD.

If you are getting standard blood work, ask for your fasting glucose and triglyceride levels. You can calculate your TyG index using the formula: ln[triglycerides (mg/dL) × fasting plasma glucose (mg/dL) / 2]. A higher result indicates higher insulin resistance and a statistically higher risk for heart disease and stroke, even if your cholesterol looks normal. Discuss this with your doctor as part of a broader cardiovascular risk assessment.

EPA-only prescription omega-3s (Icosapent Ethyl) do not raise LDL cholesterol in patients with very high triglycerides, whereas EPA+DHA combinations may increase LDL-C by 15-36%.

If you are taking prescription omega-3s for high triglycerides, ask your doctor if your medication contains only EPA or both EPA and DHA. EPA-only options (like Vascepa) do not raise your LDL ('bad') cholesterol, whereas combinations (like Lovaza) might increase it by 15-36%. This distinction is important for your overall cardiovascular risk.

High plasma levels of alpha2-Heremans-Schmid glycoprotein (AHSG/fetuin-A) are associated with insulin resistance and hepatic fat accumulation in humans, and high baseline AHSG predicts a blunted improvement in insulin sensitivity following lifestyle intervention.

High levels of a liver-derived protein called AHSG are linked to insulin resistance and fatty liver. While you don't need to test for AHSG, the study shows that reducing liver fat through lifestyle changes (diet and exercise) lowers AHSG levels. Therefore, interventions that specifically target liver fat accumulation may improve insulin sensitivity more effectively, as high baseline AHSG predicts a slower improvement in sensitivity.