Browse the evidence

Low education level and advanced age are independently associated with an increased likelihood of metabolic syndrome, regardless of obesity status.

If you have less education or are older, your risk is higher. This isn't just about willpower; it's about access. Focus on finding affordable, healthy food options and safe places to be active. Community-level changes, like better access to healthcare and fresh food, are crucial for mitigating these risks.

Age-related decline in skeletal muscle performance is driven by multifactorial mechanisms beyond sarcopenia, including excitation-contraction uncoupling, motor unit remodeling, and neural factors, which collectively reduce muscle quality and physical function.

To maintain physical function as you age, focus on more than just building muscle mass. Incorporate exercises that challenge coordination and balance, and consider the importance of neural health. A holistic approach addressing muscle, nerve, and bone health is key to preventing disability.

Excitation-contraction (E-C) uncoupling, specifically involving reduced SR Ca2+ release and reuptake, contributes significantly to the reduction in muscle quality and force production in aging skeletal muscle.

Understanding the cellular mechanisms of aging muscles can help in developing targeted therapies, such as drugs that improve calcium handling, to maintain muscle strength.

Neural factors, including motor unit remodeling, reduced voluntary activation, and cortical changes, significantly contribute to muscle weakness and reduced performance in the elderly, independent of muscle mass loss.

Resistance training may not only build muscle but also improve neural drive and motor unit recruitment, helping to maintain strength and function in older age.

High dietary cholesterol drives the sequential progression of non-alcoholic fatty liver disease (NAFLD) to hepatocellular carcinoma (HCC) by inducing gut microbiota dysbiosis and altering metabolites, specifically increasing taurocholic acid and decreasing 3-indolepropionic acid.

If you have fatty liver or high cholesterol, reducing dietary cholesterol (found in egg yolks, organ meats, and shellfish) may be critical to preventing liver cancer, not just for heart health. The key is that cholesterol changes your gut bacteria to produce toxic liver metabolites. Lowering cholesterol intake can reverse these bacterial changes and stop liver damage.

Cholesterol-lowering therapy with atorvastatin completely prevents NAFLD-HCC development in high-cholesterol diet-fed mice by restoring gut microbiota dysbiosis.

For patients with fatty liver and high cholesterol, statin therapy may offer protection against liver cancer by normalizing gut bacteria. This suggests that managing cholesterol with statins might have benefits beyond cardiovascular health for liver cancer prevention.

Classification of dietary fiber by water solubility is an unreliable predictor of physiological effects, as solubility does not directly correlate with fermentability or short-chain fatty acid (SCFA) profiles.

Do not choose foods based on whether they are 'soluble' or 'insoluble' fiber. This classification is scientifically flawed for predicting health benefits. Instead, eat a variety of fiber-rich whole foods (vegetables, fruits, whole grains, legumes) to ensure you get a mix of physiological effects.

High-molecular-weight polysaccharides (>300 kDa) from Hirsutella sinensis mycelium reduce diet-induced obesity and metabolic disorders in mice by selectively enriching the gut bacterium Parabacteroides goldsteinii.

This research suggests that consuming high-molecular-weight polysaccharides from Hirsutella sinensis (a medicinal fungus) may help manage weight and metabolic health by feeding beneficial gut bacteria, specifically Parabacteroides goldsteinii. In mice, this led to a 50% reduction in weight gain on a high-fat diet. While promising, this is an animal study. For humans, this implies that prebiotic fibers that support specific gut bacteria might be beneficial for metabolic health, but direct supplementation with this specific fungal fraction is not yet a standard human treatment.

Oral administration of live Parabacteroides goldsteinii reduces obesity, improves insulin sensitivity, and enhances thermogenesis in high-fat diet-fed mice.

This study suggests that Parabacteroides goldsteinii is a beneficial gut bacterium that can help reduce obesity and improve metabolic health. While you cannot currently buy this specific strain as a commercial probiotic supplement, the findings highlight the importance of supporting beneficial gut bacteria through diet (prebiotics) to potentially improve metabolic health.

Long sleep duration is NOT significantly associated with incident hypertension, and evidence for depression and dyslipidemia is insufficient.

Do not assume that sleeping long hours will cause high blood pressure. This study found no significant link between long sleep and hypertension, unlike its links to heart disease and mortality.

There is a linear, dose-response relationship between longer sleep duration and increased mortality risk, with significant risk increasing at sleep durations >9.5 hours.

Your risk of mortality increases linearly as you sleep more. The data suggests significant risk begins to appear when you sleep more than 9.5 hours. Sticking to 7-9 hours minimizes this specific risk.

Biological aging is driven by the interaction between accumulated cellular damage and the decline of homeostatic resilience mechanisms, rather than chronological time alone.

Focus on maintaining healthspan by understanding that aging is not just a clock ticking but a biological process influenced by damage and repair. While no specific protocol is given, the implication is that interventions targeting the hallmarks of aging (like inflammation, mitochondrial function, or senescence) may slow biological aging.

Cellular senescence and the accumulation of senescent cells contribute to tissue degeneration and age-related diseases, making their removal or suppression a potential therapeutic target.

Understanding senescence highlights the importance of maintaining tissue health and potentially targeting senescent cells in the future. Current research focuses on quantifying senescence burden in humans.

Dual energy X-ray absorptiometry (DXA) is the recommended reference standard for measuring muscle mass in clinical practice and research due to its balance of feasibility, accuracy, safety, and cost.

If you need to measure your muscle mass accurately, ask for a DXA scan. It is the current best balance of accuracy, safety, and cost. While other methods like BIA scales exist, they are less accurate for individuals. CT and MRI are too expensive and expose you to more radiation (CT) or are less available.

A high-fat, Western-style diet (HFD) causes systemic low-grade inflammation through gut dysbiosis, increased intestinal permeability (leaky gut), and subsequent translocation of lipopolysaccharide (LPS) into the bloodstream, which activates the TLR4/NF-κB inflammatory pathway.

Your diet directly shapes your gut bacteria. A diet high in fats, especially saturated and omega-6 fats, can damage your gut lining, allowing toxins (LPS) to enter your blood and trigger chronic inflammation. To protect your gut barrier, focus on reducing processed fats and increasing fiber-rich foods that support beneficial bacteria.

In older adults (over ~80 years), maintaining a gut microbiome that becomes increasingly unique (divergent from common profiles) and depletes core genera like Bacteroides is a marker of healthy ageing and predicts higher survival rates.

For older adults, the composition of your gut microbiome matters more than just its diversity. Research suggests that as you age, your microbiome naturally becomes more unique to you. This 'drift' away from common bacterial profiles (specifically a decrease in Bacteroides) is linked to better health and survival. Instead of focusing solely on boosting common bacteria, focus on a varied diet that supports a unique microbial ecosystem, as indicated by the production of specific amino acid derivatives in the blood.

Long-term calorie restriction (CR) prevents age-related large artery stiffening and endothelial dysfunction by reducing oxidative stress and inflammation.

To improve vascular health and slow aging, consider reducing your daily caloric intake by 25% while ensuring you get all necessary nutrients. This approach, validated by the CALERIE trial, has been shown to reduce cardiovascular risk factors and slow biological aging in nonobese adults.

The DunedinPoAm DNA methylation algorithm accurately quantifies the pace of biological aging (rate of decline in system integrity) rather than just chronological age, serving as a valid surrogate endpoint for testing interventions that slow aging.

This paper introduces a blood test (DunedinPoAm) that measures how fast your body is aging biologically, distinct from your chronological age. It is currently a research tool used to validate interventions like caloric restriction (CALERIE trial) that slow aging. For now, it is not a commercial consumer product, but it validates that slowing biological aging is measurable and that interventions like calorie restriction can impact this rate.

Genetic predisposition for longer habitual sleep duration is causally linked to an increased risk of schizophrenia, and conversely, genetic risk for schizophrenia causes longer sleep duration, indicating a bidirectional causal relationship.

If you naturally sleep longer than average (e.g., >8-9 hours), it may be partly due to your genetics. This paper suggests a causal link between longer sleep and higher schizophrenia risk, but also that schizophrenia risk drives longer sleep. Focus on overall mental health monitoring rather than trying to force shorter sleep, as sleep duration is largely genetically fixed.

Initiating supplemental parenteral nutrition (SPN) within the first week of ICU admission provides no clinically important benefit compared to enteral nutrition (EN) alone.

Do not start supplemental parenteral nutrition (SPN) in the first week of ICU stay for average critically ill patients. Focus on enteral nutrition (EN) tolerance. Consider SPN only after day 7 if EN remains insufficient, especially for malnourished patients.

Providing similar energy intake via parenteral nutrition (PN) as compared to enteral nutrition (EN) in the first week of critical illness results in similar clinical outcomes.

If a critically ill patient cannot tolerate enteral nutrition (EN), parenteral nutrition (PN) is an acceptable alternative. Ensure similar energy intake and monitor for glycemic control and catheter-related infections. Cost and convenience may guide the choice.

Epigenetic clocks based on DNA methylation levels can predict chronological age and the risk of aging-related diseases.

Epigenetic clocks can measure biological age. This can help assess the efficacy of aging interventions.

Medium-term recovery from moderate-to-severe SARS-CoV-2 infection is characterized by persistent multi-organ MRI abnormalities, significantly reduced exercise capacity, and impaired cognitive performance, which correlate with the severity of the initial acute illness.

If you have been hospitalized for COVID-19, do not assume you are fully recovered just because you are discharged. Expect potential long-term effects on your lungs, heart, brain, and energy levels. Seek medical evaluation for persistent breathlessness or fatigue, and consider a gradual, monitored return to physical activity rather than pushing through symptoms, as your exercise capacity may be significantly reduced.

Post-acute SARS-CoV-2 infection is associated with specific brain MRI changes (thalamic T2* signal, white matter diffusivity) and impaired executive/visuospatial cognitive performance, which correlate with the severity of the initial inflammatory response.

If you are experiencing 'brain fog' or difficulty with planning and spatial tasks after COVID-19, it may be linked to structural changes in your brain. Consider a neuropsychological evaluation to assess cognitive function, as these deficits are common and may require specific cognitive rehabilitation strategies.