Browse the evidence

Increased abundance of Lachnospiraceae, particularly Blautia and Roseburia, is associated with metabolic disturbances, including obesity and type 2 diabetes, primarily through enhanced energy extraction from dietary carbohydrates and elevated circulating short-chain fatty acids (SCFAs).

If you are managing weight or blood sugar, be aware that not all fiber-fermenting bacteria are equal. An overgrowth of Lachnospiraceae (like Blautia) can actually increase the calories you absorb from carbohydrates, potentially worsening metabolic health. Focus on dietary patterns that support a balanced microbiome rather than just maximizing 'good bacteria' counts, especially if you consume high-carb diets.

Modulation of NAD+ metabolism, specifically through the salvage pathway enzyme NAMPT and its product NMN, acts as a metabolic sensor that regulates energy metabolism, oxidative metabolism, and potentially extends lifespan.

Maintaining healthy NAD+ levels is linked to better metabolic function and potentially longevity. You can support this through a diet rich in niacin (Vitamin B3) and its precursors, found in foods like meat, fish, and vegetables. While specific supplements like NMN or NR are discussed in research, the fundamental takeaway is supporting your body's natural NAD+ salvage pathways through balanced nutrition.

Sirtuins are NAD+-dependent protein deacetylases that function as metabolic sensors, linking cellular NAD+ levels to downstream metabolic pathways and gene expression.

Sirtuins are proteins that help your cells respond to energy status. They require NAD+ to function. Supporting your overall NAD+ levels through healthy lifestyle habits may support sirtuin activity, which is associated with aging and metabolic health.

Gut microbiota composition influences energy harvest and fat storage, with obese individuals often exhibiting higher abundances of Firmicutes and methanogens that enhance short-chain fatty acid (SCFA) production and energy extraction from indigestible carbohydrates.

Your gut bacteria actively help you harvest energy from food. While you cannot directly 'eat' specific bacteria to lose weight, your diet rapidly shapes your microbiome. Shifting towards a diet rich in diverse fibers (plant polysaccharides) can alter your microbial community to potentially reduce the efficiency of energy harvest compared to a Western diet high in fat and sugar. Focus on dietary diversity to support a healthy microbiome.

Physical activity interventions during pregnancy do not significantly reduce gestational weight gain compared to dietary interventions and do not significantly improve obstetric outcomes like pre-eclampsia or gestational diabetes.

While light physical activity is safe, it is less effective than dietary changes for controlling weight gain and preventing pregnancy complications. Prioritize dietary adjustments with professional guidance for better outcomes.

Creatine supplementation attenuates noise-induced hearing loss and protects inner/outer hair cells in mice, suggesting a preventive role for noise-exposed individuals.

If you work in a noisy environment or are concerned about hearing loss, creatine supplementation may help protect your inner ear hair cells. While most people take creatine for muscle, it also supports energy production in sensory cells. It is safe and may offer a preventive benefit against noise-induced damage.

Elevated serum creatine kinase (CK) following exercise is primarily a marker of cellular energy regulation and membrane permeability changes driven by AMPK, rather than a direct indicator of structural muscle damage or necrosis.

Do not use serum CK levels alone to judge workout quality or injury risk. High CK is a normal physiological response to energy demands and membrane permeability changes, often regulated by AMPK, and does not automatically imply structural damage. Focus on performance metrics and recovery feelings instead.

Exposure to environmental factors such as road traffic noise and fine particulate matter increases the risk of type 2 diabetes by 20-40% for every 10 dB increase in noise or 10 μg/m3 increase in fine dust.

Minimize your exposure to road traffic noise and fine particulate matter, as living near busy roads increases diabetes risk by 20-40%. Use air purifiers, soundproof your home, and spend time in greener areas to reduce this environmental risk factor.

Resveratrol extends lifespan in invertebrate models (yeast, C. elegans, Drosophila) by activating sirtuins (specifically Sir2/SIRT1), mimicking the effects of calorie restriction, though this mechanism is controversial in vertebrates and humans.

Resveratrol extends lifespan in simple organisms like worms and flies by activating sirtuins, similar to calorie restriction. However, this effect is not clearly replicated in humans or other vertebrates, and the mechanism is debated. Do not rely on it as a substitute for healthy living.

Specific SCFAs (propionate and acetate) increase energy expenditure and fat oxidation by activating FFA3 and FFA2 receptors, respectively, independent of changes in food intake.

While you cannot directly inject SCFAs, consuming fermentable fibers (resistant starch, inulin) allows your gut bacteria to produce them. This process may subtly boost your fat burning and energy expenditure by stimulating your sympathetic nervous system, acting as a small but consistent metabolic booster alongside exercise.

Caloric restriction and fasting-mimicking diets modulate aging pathways (NF-κB, mTOR, MAPK) to reduce pro-inflammatory cytokines (IL-1β, IL-6, TNF-α) and counteract inflamm-aging.

Intermittent fasting or caloric restriction may help reduce chronic inflammation in older adults by modulating key aging pathways. However, these approaches require careful planning and may not be suitable for everyone, especially those with poor nutrition.

Total energy intake acts as a primary determinant of disease risk and serves as a critical confounder in nutritional epidemiology because nutrient intakes are positively correlated with total energy consumption.

When analyzing diet or health outcomes, do not look at specific nutrients in isolation. Total energy intake is a primary determinant of disease and confounds the relationship between specific nutrients and health. You must account for total calories to understand the true impact of dietary composition.

In adult critically ill patients, providing higher energy intake (up to 30 kcal/kg/day) compared to lower intake (down to 300 kcal/day) does not significantly improve clinical outcomes such as mortality, length of stay, or infection rates.

For critically ill adults in the ICU, aim for 12-25 kcal/kg/day during the first 7-10 days. Do not aggressively push for higher calories, as studies show no benefit over lower doses and potential risks like hyperglycemia. Monitor blood sugar and triglycerides closely.

Activation of the bile acid receptor TGR5 (GPBAR1) increases energy expenditure and thermogenesis in brown adipose tissue and muscle, and stimulates GLP-1 release to improve glucose tolerance.

Bile acids that activate TGR5 (like those from certain diets or supplements) may help burn more energy and improve blood sugar control by stimulating GLP-1. However, specific TGR5-targeted drugs are still in development and not yet standard care.

Early menarche is associated with an increased risk of NAFLD in adulthood, primarily driven by excess adiposity rather than estrogen activation itself.

Women who start their periods early should be vigilant about weight management. Although early estrogen exposure is generally protective, it is often linked to higher body fat later in life, which cancels out that protection and increases the risk of fatty liver disease.

Panax ginseng berry extract reduces body weight in obese mice by decreasing food intake and increasing energy expenditure, whereas its isolated active component, ginsenoside Re, lowers blood glucose without affecting body weight.

The full Panax ginseng berry extract helps obese mice lose weight by making them eat less and burn more energy. However, the specific compound responsible for lowering blood sugar (ginsenoside Re) does not cause weight loss. This suggests that if you are looking for blood sugar control, you might not need the weight-loss effects, and if you want weight loss, you need the full extract, not just the isolated glucose-lowering component.

Calorie restriction (CR) attenuates the age-related upregulation of proinflammatory cytokines (NF-κB, IL-β, IL-6, and TNF-α), serving as a primary intervention to counteract inflamm-aging.

Adopting a calorie-restricted diet with adequate nutrients is a proven strategy to reduce chronic inflammation associated with aging. This involves eating less than your maintenance calories while ensuring you get all necessary vitamins and minerals, which helps lower inflammatory markers like IL-6 and TNF-α.

Alcohol consumption increases diet-induced thermogenesis (DIT) similarly to protein, but it does not positively affect energy balance or body weight regulation.

While alcohol does increase the calories burned during digestion (thermogenesis), it adds extra calories to your diet without helping you feel fuller or burn enough extra energy to offset the intake. Therefore, it does not help with weight management.

Androgen excess reduces brown adipose tissue (BAT) thermogenesis by downregulating UCP-1, contributing to the metabolic profile of PCOS.

Low BAT activity may contribute to weight gain in PCOS. While not directly treatable by a specific drug in this text, understanding this link highlights why metabolic rate might be lower than expected.

Higher daily hours of television viewing are positively associated with higher body mass index (BMI) in adult women, particularly low-income women.

For women, watching more TV per day is linked to higher body weight. This link is strongest for low-income women. To manage weight, reducing TV time may help lower overall calorie intake.

There is no significant association between fast food consumption or TV viewing and body mass index in adult men aged 20-45.

For men, fast food consumption and TV viewing were not significantly linked to body weight in this study. Other factors may be more relevant for weight management in men.

Antibiotic exposure, particularly in infancy, is associated with long-term reduction in bacterial diversity and increased risk of weight gain and obesity.

If you or your child must take antibiotics, be aware it may impact weight and gut health long-term. Post-treatment, focus on prebiotic fibers to help restore bacterial diversity.

There is limited or insufficient data to show that preventing type 2 diabetes through lifestyle changes results in a lower risk of cardiovascular and microvascular complications.

While preventing diabetes is a huge health win, current evidence does not yet prove that it automatically reduces your risk of heart disease or other complications. You should still manage other risk factors like blood pressure and cholesterol.

Methylene blue does not significantly extend median lifespan in male or female mice, but significantly increases maximum lifespan (90th percentile) in females.

Methylene blue did not extend the average lifespan of mice, but it did slightly increase the maximum lifespan of female mice. This suggests a very limited potential for extending the very end of life, but not overall longevity.