Browse the evidence

Pre-diabetes (Impaired Fasting Glucose and Impaired Glucose Tolerance) is associated with a twofold higher risk of cardiovascular events compared to normoglycemic subjects, driven by insulin resistance and clustering of risk factors.

If you have pre-diabetes, your risk of a heart event is already double that of someone with normal blood sugar. You should address insulin resistance and lifestyle factors immediately, rather than waiting for a diabetes diagnosis.

Higher gut microbial alpha diversity (Shannon index and richness) and a higher abundance of specific butyrate-producing bacterial taxa are associated with lower insulin resistance (HOMA-IR) and a lower prevalence of type 2 diabetes.

Maintaining a diverse gut microbiome, particularly one rich in butyrate-producing bacteria, is linked to better insulin sensitivity and a lower risk of Type 2 Diabetes. While this study is observational, it suggests that dietary strategies supporting microbial diversity (often associated with high-fiber, plant-rich diets) may support metabolic health.

Bariatric surgery, particularly malabsorptive and mixed procedures like Roux-en-Y gastric bypass and biliopancreatic diversion, leads to significant resolution or improvement of type 2 diabetes, often independent of or preceding significant weight loss.

Surgery can put type 2 diabetes into remission for many patients, sometimes before significant weight loss occurs, due to hormonal changes in the gut.

Low-GI breakfasts can produce a 'second-meal effect' that significantly reduces post-prandial glycaemia and insulinaemia at a subsequent lunch, provided the breakfast induces a prolonged absorptive phase.

Choose low-GI breakfasts that are likely to have a 'second-meal effect,' such as those based on spaghetti or barley. These can help control blood sugar at lunch. Avoid low-GI foods that do not trigger this effect, like white bread with vinegar, even if they are technically low-GI.

Supplementation with olive leaf extract (51.1 mg oleuropein and 9.7 mg hydroxytyrosol daily) for 12 weeks significantly improves insulin sensitivity and pancreatic beta-cell responsiveness in overweight middle-aged men.

If you are an overweight man between 35 and 55 years old, taking olive leaf extract containing roughly 51 mg of oleuropein and 10 mg of hydroxytyrosol daily for 12 weeks may improve your body's ability to use insulin and manage blood sugar. This benefit was observed when participants maintained their usual diet and exercise habits, suggesting the supplement itself drives the change. It is not a substitute for medical advice but may offer a beneficial adjunct for metabolic health.

Diet-induced weight loss triggers persistent physiological adaptations—including reduced energy expenditure and altered appetite-regulating hormones—that actively promote weight regain, making long-term maintenance difficult without compensatory behavioral strategies.

Expect your body to fight back after you lose weight. Your hormones will change to make you hungrier and burn fewer calories. This is biology, not a character flaw. To succeed, you must adopt rigid behavioral strategies (like high self-monitoring, regular exercise, and low-calorie diets) to counteract these physiological drives, as willpower alone is insufficient.

High protein intake (≥1.5 g/kg/day) does not cause renal damage or disease in healthy individuals with normal renal function, as observed increases in glomerular filtration rate (GFR) and renal hypertrophy are normal adaptive mechanisms.

If you are healthy, you can safely eat high amounts of protein (1.5g/kg/day or more) without worrying about damaging your kidneys. Your body adapts by filtering blood faster, which is a normal function. This advice does not apply if you already have diagnosed kidney disease.

Dietary protein restriction is an appropriate and effective treatment to slow the progression of chronic kidney disease (CKD) in patients with existing renal impairment.

If you have been diagnosed with kidney disease, follow your doctor's advice to restrict protein intake. This can help slow the progression of your condition. This does not apply to healthy people.

Chronic exercise training (12 weeks, 4 days/week) increases skeletal muscle GLUT-4 protein levels and improves insulin-stimulated glucose disposal in older subjects with impaired glucose tolerance, independent of changes in body composition.

If you are older and have trouble processing sugar, consistent aerobic exercise (like cycling) 4 days a week for 3 months can significantly improve how your muscles use insulin and increase the amount of glucose transporters in your muscles. This happens even if you do not lose weight, meaning the metabolic benefits are distinct from weight loss.

Insulin resistance (IR) is a primary pathophysiological driver of Type 2 Diabetes Mellitus (T2DM) and metabolic syndrome, and can be effectively screened using the Homeostasis Model Assessment of Insulin Resistance (HOMA-IR).

If you are overweight or have a family history of diabetes, ask your doctor to check your Insulin Resistance (IR) using the HOMA-IR index. This involves a simple fasting blood test for glucose and insulin. Identifying IR early allows for lifestyle changes (diet and exercise) to prevent Type 2 Diabetes.

Night-shift work significantly increases the incidence of metabolic syndrome in healthcare workers compared to daytime work, independent of traditional risk factors.

If you work night shifts, your risk of developing metabolic syndrome (high blood pressure, high blood sugar, abnormal cholesterol, and excess body fat around the waist) is significantly higher than day workers, even if you are active. You should undergo regular medical check-ups focusing on these metrics. If you develop signs of metabolic syndrome, consult a doctor immediately; lifestyle changes are critical, and changing your work schedule to day shifts may be necessary if the condition persists.

Metformin treatment produces comparable weight loss across all race-gender groups, including Black women, unlike lifestyle interventions.

If you are Black and struggling with weight loss through lifestyle changes alone, Metformin may offer a more equitable outcome compared to White or Hispanic peers. It produces modest but consistent weight loss across all groups. Discuss this option with your doctor, especially if you have impaired glucose tolerance.

Industrial trans fatty acids (iTFA) promote cardiovascular disease risk through multiple mechanisms including increased LDL/HDL cholesterol ratio, activation of NF-κB-mediated inflammation, and induction of endoplasmic reticulum (ER) stress and oxidative stress.

Avoid industrial trans fats found in partially hydrogenated oils, as they raise bad cholesterol, lower good cholesterol, and trigger inflammation and cellular stress. While trans fats in natural dairy and meat exist, current evidence suggests they do not cause the same inflammatory or cellular damage as industrial versions, though moderation is still advised.

Within the normal physiological range, higher serum TSH concentrations are associated with greater body weight and increased longitudinal weight gain.

If you are gaining weight despite stable habits, check your TSH even if it falls within the 'normal' lab range. Higher TSH levels within this normal window are linked to higher body weight and weight gain, suggesting that optimizing thyroid function might be a relevant factor in weight management.

Visceral fat accumulation is the strongest independent determinant of systemic oxidative stress, as measured by urinary 8-epi-prostaglandin F2α, and this association is stronger in non-obese individuals than in the general population.

Your metabolic health risk from oxidative stress is tied more to your belly fat (visceral fat) than your total body weight. Even if you are not 'overweight' by BMI standards, high visceral fat is a strong predictor of systemic oxidative stress and metabolic syndrome. Focus on reducing abdominal fat through lifestyle changes rather than just focusing on total body weight.

Intrahepatic fat (liver fat) is a stronger and independent predictor of insulin resistance compared to visceral adipose tissue (VAT) or whole-body fat mass.

Focus on body composition rather than just weight. High liver fat is a key driver of insulin resistance, independent of visceral fat. Strategies that reduce liver fat (like weight loss, which disproportionately reduces liver fat by 44%) and preserve skeletal muscle mass are critical for metabolic health, even if total weight change is modest.

Skeletal muscle mass is inversely correlated with insulin resistance, and low muscle mass (sarcopenia) exacerbates insulin resistance in obese individuals, particularly when combined with high fat mass (sarcopenic adiposity).

When losing weight, prioritize preserving muscle mass through resistance training and adequate protein intake. Simply losing weight without maintaining muscle can worsen insulin resistance, especially in older adults or those with 'sarcopenic obesity'.

Excessive dietary fructose consumption (particularly from sugar-sweetened beverages) drives the development of Non-Alcoholic Fatty Liver Disease (NAFLD) and metabolic syndrome by stimulating hepatic de novo lipogenesis (DNL) and increasing VLDL secretion.

Limit intake of added sugars, specifically fructose and high-fructose corn syrup, found in sugar-sweetened beverages and processed foods. This is particularly critical if you have abdominal obesity or metabolic risk factors, as fructose uniquely drives liver fat accumulation and triglyceride production independent of total weight gain.

Nonalcoholic fatty liver disease (NAFLD) acts as an independent cardiometabolic risk factor that exacerbates hepatic insulin resistance, increases the incidence of type 2 diabetes (T2DM), and worsens glycemic control and vascular complications in patients with established T2DM.

If you have type 2 diabetes or obesity, getting a liver ultrasound is critical even if your blood work looks normal. NAFLD significantly increases your risk of developing full-blown diabetes and heart disease. Treating the liver fat through weight loss and metabolic control is not just about liver health, but a primary strategy for preventing diabetes complications.

Eight weeks of passive heat therapy (hot water immersion) significantly improves endothelial function, reduces arterial stiffness, and lowers blood pressure in sedentary young adults, with effects comparable to or exceeding those of exercise training.

If you cannot perform aerobic exercise, consider passive heat therapy (hot tub immersion) as a cardiovascular intervention. Immerse in hot water (approx 40.5°C) 4-5 times a week for 8 weeks, aiming to raise your core body temperature to at least 38.5°C. This protocol has been shown to improve blood vessel function and lower blood pressure in sedentary individuals, potentially offering similar benefits to exercise training.

Weight loss in obese men reduces circulating levels of IL-6 and TNF-alpha, which correlates with improved insulin sensitivity, but paradoxically increases circulating IL-8 levels.

For obese men, significant weight loss (approx 15% body weight) improves insulin sensitivity and reduces specific inflammatory cytokines (IL-6, TNF-alpha). However, be aware that IL-8 levels may paradoxically rise during this process. This rise in IL-8 does not appear to negate the metabolic benefits (insulin sensitivity) gained from the weight loss, likely due to complex release mechanisms from fat tissue or other inflammatory sources.

Ingested proteins suppress the orexigenic hormone ghrelin more strongly and sustainably than isocaloric carbohydrates or lipids, while carbohydrates induce a biphasic response with a late-phase rebound above baseline.

To manage hunger and support weight loss, prioritize protein over carbohydrates and fats in your meals. Protein provides the strongest and most sustained suppression of the hunger hormone ghrelin. Be aware that carbohydrates, while suppressing ghrelin initially, can cause a 'rebound' effect hours later, potentially triggering hunger and overeating. Lipids are the least effective at suppressing ghrelin.

Consuming one additional serving per day of sugar-sweetened beverages (SSB) increases the relative risk of incident hypertension by 8% and coronary heart disease (CHD) by 17%.

To lower your risk of high blood pressure and heart disease, aim to reduce your daily intake of sugar-sweetened beverages. Each serving you cut back can significantly lower your risk. Focus on replacing these drinks with water or unsweetened alternatives, as the sugar and fructose in sodas and sweet teas drive inflammation and blood pressure issues.

Insulin resistance (IR) and hyperinsulinemia accelerate muscle protein degradation and reduce synthesis, directly causing sarcopenia.

Managing blood sugar and insulin sensitivity is crucial for preserving muscle mass. If you have insulin resistance or pre-diabetes, addressing it may help prevent the accelerated muscle loss associated with aging and metabolic syndrome.