Browse the evidence

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.

Metabolic flexibility—the ability of skeletal muscle to switch between fat and glucose oxidation in response to fasting and insulin—is a key determinant of insulin sensitivity and leanness.

To improve metabolic health, focus on building aerobic fitness and maintaining leanness. These factors enhance your muscles' ability to switch between burning fat and glucose, which is crucial for insulin sensitivity. Simply losing weight without improving fitness may not restore this flexibility.

Moderate weight loss alone, without concurrent improvement in aerobic fitness, fails to restore the capacity for fat oxidation in overweight and obese individuals, although it may improve insulin's suppression of fat oxidation.

If you lose weight without exercising aerobically, your muscles may still struggle to burn fat efficiently. To fully restore metabolic flexibility, combine weight loss with aerobic fitness training.

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.

Rotating shift work involving night shifts causes significant sleep loss, increased sleepiness, and reduced performance due to circadian misalignment, with negligible long-term physiological adaptation.

If you work night shifts, expect to be sleepier and less accurate, especially in the early morning hours. Your body will not fully 'get used to' this over time. Prioritize sleep hygiene and consider requesting schedule rotations that move forward (morning to night) rather than backward, as this is biologically easier.

Night shift work is associated with a significantly higher risk of single-vehicle accidents, particularly in the early morning hours, due to fatigue-induced performance lapses.

Driving or operating machinery during the early morning hours (e.g., 2 AM - 5 AM) after a night shift carries a high risk of accident due to fatigue. If possible, avoid driving immediately after a night shift or ensure adequate rest before operating vehicles.

Low BMI (<17.5) is associated with an increased risk of cardiovascular disease mortality in East Asians, creating a U-shaped relationship with CVD death.

For East Asians, being underweight (BMI <17.5) is associated with a significantly increased risk of cardiovascular death. Aim for a BMI between 20.0 and 22.4, which is associated with the lowest risk. Avoid extreme thinness, as it may indicate underlying health issues or low muscle mass that increases CVD risk.

Increasing caloric intake from 400 kcal to 1,000 kcal worsens glycemic control despite continued weight loss, demonstrating that caloric restriction has an independent effect on glucose levels.

If you are an obese type II diabetic, simply losing weight might not be enough to maintain good blood sugar control if you increase your calories. The study suggests that maintaining a lower caloric intake is crucial for keeping glucose levels low, even if you continue to lose 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'.

Implementing an intuitive eating approach (eating when hungry, stopping when full, no food restrictions) results in weight maintenance rather than significant weight loss in overweight/obese individuals, while significantly improving psychological health indicators.

Focus on eating when you are physically hungry and stopping when you are comfortably full, without labeling foods as 'good' or 'bad'. This approach is unlikely to result in significant weight loss or increased physical activity, but it may help maintain your current weight and significantly improve your psychological well-being, body image, and relationship with food. It requires practice to distinguish true hunger from emotional or environmental cues.

Magnesium deficiency induces chronic low-grade inflammation through increased intracellular calcium, leading to elevated pro-inflammatory cytokines (TNF-α, IL-1, IL-6) and acute-phase proteins (CRP, fibrinogen).

If you have chronic inflammation or risk factors like high blood pressure or diabetes, check your magnesium intake. Most people don't get enough. While supplements won't fix inflammation if you're already healthy and well-nourished, correcting a deficiency can lower inflammatory markers and reduce disease risk. Focus on magnesium-rich foods like nuts, seeds, and leafy greens.

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.

Intrahepatic triglyceride content is a stronger determinant of insulin resistance and glycemic control than visceral adipose tissue or intramyocellular lipid content.

Focus on reducing liver fat, not just overall weight. While weight loss helps, the specific reduction of fat stored in the liver is crucial for restoring insulin sensitivity. This may require targeted dietary changes (reducing fructose/sugars) and exercise, as liver fat is a distinct metabolic driver.

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.

Females bear a disproportionately higher burden of malnutrition-related mortality and DALYs compared to males, while males experience higher obesity-related DALYs, indicating sex-specific vulnerabilities in the double burden of disease.

Nutrition and health policies must be sex-specific. Women face higher risks of malnutrition due to biological needs and social inequities in food access, while men face higher risks of obesity. Interventions should address these distinct vulnerabilities rather than using a one-size-fits-all approach.

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.

Sarcopenic obesity (low muscle mass + high visceral fat) carries a significantly higher risk of metabolic syndrome and adverse health outcomes than either condition alone.

If you have excess belly fat but low muscle strength, your risk for metabolic syndrome is extremely high. Focus on resistance training to build muscle while managing diet to reduce visceral fat, rather than just losing weight.

Adherence to a Mediterranean dietary pattern (MeDi) is associated with a decreased risk of dementia and better cognitive performance, particularly in memory, language, and visuospatial domains, in elderly populations.

To support cognitive health and potentially lower dementia risk, aim for a Mediterranean dietary pattern. This involves high consumption of non-refined cereals, fruits, vegetables, legumes, fish, and olive oil, while limiting red meat and full-fat dairy. In this study, each unit increase in adherence score was linked to a 10% decrease in dementia odds, with the strongest benefits seen in memory and language functions. Start by incorporating more fish and whole grains into your weekly meals.