Browse the evidence

Low patient compliance with exercise training programs is a major drawback limiting the effectiveness of exercise as a therapeutic intervention for cardiovascular disease prevention at the population level.

Sticking to an exercise routine is hard, especially when doing it alone at home. To succeed, seek supervised programs, join community groups, or start with very small, manageable goals to build habit.

Intensive glycemic control (targeting HbA1c <6.0-6.5%) slows the progression of microvascular complications (retinopathy, nephropathy, neuropathy) in type 2 diabetes, but does not significantly reduce macrovascular events within the first 3-5 years of treatment.

For Type 2 Diabetes, keeping blood sugar very low (HbA1c <6.5%) protects your eyes, kidneys, and nerves, but this protection takes years to show up in heart health. Be aware that aggressive sugar lowering can increase the risk of dangerous low blood sugar episodes, so the target must be balanced carefully with your doctor.

Sleep is an actively generated state by the central nervous system, regulated by homeostatic and circadian processes, rather than a passive loss of wakefulness.

Understand that sleep is an active biological process. Disrupting this active process (e.g., through poor sleep hygiene or disorders) has significant consequences because the brain is actively working to regulate states.

Adopting a low glycemic index (GI) diet does not improve cardiovascular risk factors or insulin sensitivity compared to a high GI diet when total carbohydrate intake is high and other nutrients are controlled.

If you eat a high-carbohydrate diet, switching to 'low glycemic index' foods (like swapping white bread for whole wheat or pasta for lentils) will not necessarily improve your insulin sensitivity or heart health markers. In fact, this study suggests it might slightly worsen insulin sensitivity and raise LDL cholesterol compared to high GI carbs, provided your total calories, fiber, and saturated fat remain constant. Focus on reducing total carbohydrate quantity if you want to improve triglycerides and insulin sensitivity, rather than just swapping carb types.

Specific cytokines (IL-1, TNF, IFN) produced during the immune response act on the brain to increase non-REM sleep duration, demonstrating a bidirectional communication between the immune system and sleep regulation.

Your immune system uses chemical signals (cytokines) to tell your brain to sleep more when you are sick. This is a biological command to prioritize healing over other activities.

The rapid increase in global obesity prevalence is primarily driven by environmental factors—specifically the high availability of energy-dense foods and increasingly sedentary lifestyles—rather than changes in the human gene pool.

Focus on your environment, not just your genetics. The rise in obesity is driven by easy access to high-calorie foods and less physical movement. To manage weight, prioritize reducing the availability of energy-dense foods in your home and increase daily physical activity, as these environmental factors are the primary drivers of weight gain regardless of your genetic background.

Chronic inhibition of mTORC2 by rapamycin causes metabolic dysfunction (glucose intolerance, insulin resistance) and immunosuppression, acting as the primary barrier to its use as an anti-aging therapy.

Chronic daily use of rapamycin is likely unsafe for long-term anti-aging due to the risk of diabetes and immune suppression caused by mTORC2 inhibition. This mechanism explains why 'more is not better' with this drug.

Genetic predisposition to obesity, particularly variants in FTO and MC4R, increases the risk of type 2 diabetes, cardiovascular disease, and certain cancers primarily through its effect on BMI, establishing a causal link between obesity and these comorbidities.

If you have a family history of obesity, recognize that your genetic risk may make you more susceptible to weight gain and related metabolic issues. This doesn't mean you are doomed, but it does mean you should prioritize preventive lifestyle measures (diet, activity) earlier and more consistently than those without such risk factors.

Current tobacco smoking modifies genetic susceptibility to obesity traits, specifically increasing genetic variance explained for overall adiposity (BMI) while attenuating genetic effects on body fat distribution (waist-to-hip ratio).

If you smoke, your genetic risk for gaining overall weight (BMI) may be higher than if you didn't smoke, but your genetic risk for storing fat around your waist (body shape) may be lower. Quitting smoking might change how your genes express themselves regarding weight distribution. This highlights that lifestyle choices like smoking can interact with your DNA to influence your body composition.

Insulin resistance drives NAFLD pathogenesis through two main mechanisms: increased adipose tissue lipolysis (free fatty acid overflow) and increased hepatic de novo lipogenesis (fatty acid synthesis), leading to triglyceride accumulation.

Addressing insulin resistance is the most critical step in managing fatty liver. This involves caloric restriction, weight loss, and dietary changes that reduce insulin spikes, thereby reducing both the release of fatty acids from fat tissue and the liver's production of new fat.

Dietary restriction extends lifespan in laboratory model species (yeast, nematodes, flies, rodents) by reducing both age-dependent and age-independent mortality rates, but this effect is significantly attenuated or absent in non-model species and males.

Dietary restriction can extend lifespan in model organisms, but the benefit is not universal. It appears stronger in females and specific lab-adapted species. For humans, the balance of protein to calories matters more than total calories alone. Do not assume lab results translate directly to wild-type human physiology without considering sex and genetic background.

Chronic treatment with GDF15 promotes greater weight loss and reduces NAFLD compared to caloric restriction alone by maintaining energy expenditure and preventing adaptive thermogenesis in skeletal muscle.

This research suggests that GDF15 therapy could help overcome the metabolic slowdown (adaptive thermogenesis) that typically halts weight loss during dieting. By maintaining energy expenditure, particularly through fatty acid oxidation in muscle, GDF15 allows for greater fat loss than dieting alone. This is relevant for individuals who hit weight loss plateaus despite strict caloric restriction.

GDF15 maintains energy expenditure and promotes weight loss through a GFRAL-dependent signaling axis that activates beta-adrenergic receptors in skeletal muscle, increasing fatty acid oxidation and calcium futile cycling.

The weight loss benefits of GDF15 rely on a specific biological pathway involving the GFRAL receptor and beta-adrenergic signaling in muscles. If this pathway is blocked or missing, the energy expenditure benefits are lost.

Suspension of routine primary care during the initial COVID-19 lockdown (March 2020) caused a 76%-88% reduction in essential Type 2 diabetes health checks (HbA1c, blood pressure, BMI, etc.) compared to historical trends, with recovery remaining 28%-47% below expected rates through December 2020.

Do not skip your routine diabetes checks. The pandemic showed that missing even a few months of HbA1c, blood pressure, and kidney function tests leads to a significant backlog of untreated risks. If in-person visits are restricted, ask your provider about home monitoring kits or telehealth options to ensure your care continues uninterrupted.

COVID-19 lockdown restrictions caused a 19% reduction in new diabetes medication prescribing and a 22% reduction in new antihypertensive prescribing, while repeat prescribing remained stable.

If you have been diagnosed with Type 2 Diabetes or high blood pressure recently, do not assume your care has paused. The study shows a significant drop in new prescriptions during lockdowns. Contact your provider to discuss starting necessary medications, potentially using remote monitoring to bypass the need for immediate in-person visits.

Ectopic lipid accumulation in non-adipose tissues (liver, muscle) causes insulin resistance primarily through diacylglycerol and ceramide signaling, not triglyceride storage itself.

Insulin resistance in obesity is driven by specific fat molecules (DAG and ceramide) that interfere with insulin signaling, not just the total amount of fat stored in organs.

Ghrelin is an orexigenic hormone that stimulates food intake and reduces energy expenditure by activating NPY/AgRP neurons in the hypothalamus, acting in opposition to leptin.

Ghrelin is your body's natural 'hunger hormone' that rises before meals and falls after eating. It works by stimulating specific brain neurons (NPY/AgRP) to increase food intake and reduce fat burning. To manage energy balance, recognize that ghrelin levels naturally fluctuate with fasting and feeding; strategies that stabilize blood sugar and maintain muscle mass can help modulate these natural hormonal swings.

Manipulating dietary Glycemic Index (GI) or Glycemic Load (GL) does not provide a significant benefit for weight loss, satiety, or cardiometabolic risk factors compared to isocaloric high-GI diets when fiber and energy intake are controlled.

Stop obsessing over the Glycemic Index for weight loss or health. The science shows that swapping high-GI foods for low-GI ones does not help you lose more weight or feel fuller, provided you eat the same amount of calories and fiber. Focus on eating whole foods, vegetables, and fiber-rich carbohydrates instead of calculating GI numbers. If you enjoy high-GI foods like white rice or potatoes, include them as part of a balanced meal with fiber and protein; they will not sabotage your health goals.

Epigenetic aging, as measured by the Skin&blood clock, is distinct from cellular senescence, telomere attrition, and genomic instability, but is associated with nutrient sensing, mitochondrial activity, and stem cell composition.

Epigenetic age is not a simple proxy for cellular damage or telomere length. Interventions that extend lifespan (like caloric restriction or rapamycin) slow epigenetic aging, while those that extend lifespan via other mechanisms (like NAD precursors or metformin in this specific context) may not. To influence epigenetic age, focus on nutrient sensing (mTOR pathway) and mitochondrial health, as these are mechanistically linked to the clock's ticking, distinct from DNA repair or telomere maintenance.

Women with diabetes have a 30% greater excess risk of cardiovascular disease (CVD) mortality compared to men with diabetes, driven largely by a higher risk of coronary heart disease (CHD) mortality.

Women with diabetes face a 30% higher relative risk of dying from heart disease than men with diabetes. This underscores the importance of rigorous cardiovascular monitoring and prevention for women, potentially requiring more aggressive management than standard protocols might imply.

Fructose-containing sugars do not exhibit unique metabolic or endocrine harms causing obesity or cardiometabolic disease when consumed in isocaloric substitution for other digestible carbohydrates; any adverse effects are mediated solely by excess caloric intake.

You do not need to fear fructose or added sugars if you are consuming them within your daily calorie needs and replacing other carbohydrates. Isocaloric substitution of fructose for other carbs does not worsen cardiometabolic risk factors like blood pressure, lipids, or insulin sensitivity. Focus on total energy balance and overall dietary quality rather than demonizing specific sugars.

M2 macrophages sustain insulin sensitivity by secreting IL-4 and IL-10, whereas M1 macrophages induce insulin resistance through proinflammatory cytokines like TNFα.

The type of immune cells in fat tissue matters. M2 macrophages help insulin work, while M1 macrophages hinder it. Maintaining a balance favoring M2 activity may support metabolic health.

Bariatric surgery induces significant lean body mass (LBM), fat-free mass (FFM), and skeletal muscle mass (SMM) loss, with approximately 55% of LBM loss occurring within the first 3 months post-surgery.

If you undergo bariatric surgery, expect to lose about 8 kg of lean body mass within the first year, with more than half of that loss happening in the first 3 months. This is not just fat loss; it includes muscle. To protect your metabolism and function, you must prioritize protein intake and resistance training immediately after surgery, not just focus on calorie restriction.

Successful long-term weight loss maintenance likely requires targeting multiple redundant hormonal systems simultaneously rather than a single molecule.

Treating obesity is complex because your body has multiple redundant systems that fight weight loss. Relying on a single drug or diet strategy is unlikely to work long-term. Effective management likely involves addressing multiple aspects of your biology and lifestyle simultaneously.