Browse the evidence

Caloric restriction (CR) is an effective intervention that impacts aging, age-related pathologies, and longevity in model organisms such as mice and rats.

While this paper confirms caloric restriction extends longevity in mice and rats, it does not provide specific human dosing protocols. For humans, this suggests that avoiding overconsumption and maintaining a healthy weight may support healthy aging, but specific restriction protocols should be discussed with a healthcare provider.

Epigenetic clocks, such as the DNAm PhenoAge and DunedinPoAm, can predict biological age, lifespan, and risk of chronic disease.

Epigenetic clocks are emerging tools to measure biological aging. While not yet standard clinical practice, they may eventually help individuals track the impact of lifestyle changes on their biological age.

The global prevalence of sarcopenia varies significantly (10-27%) depending on the diagnostic classification and measurement instrument used, with no single standardized criterion currently established.

Because there is no single standard for diagnosing sarcopenia, prevalence rates you see in media or different clinics will vary widely (10-27%). If you are concerned about muscle loss, ask your provider which diagnostic criteria they are using (e.g., EWGSOP2) and which tool (DXA or BIA) they used, as this determines the result. Consistency in testing is more important than comparing your result to a global average.

The prevalence of severe sarcopenia ranges from 2% to 9% globally, with higher rates observed in European studies using EWGSOP criteria compared to Asian/Oceanic studies using other classifications.

Severe sarcopenia, which combines low muscle mass with poor physical performance (like slow gait speed), affects 2-9% of the population depending on how it is measured. It is a stronger predictor of mortality than sarcopenia alone, so early identification using standardized performance tests is critical.

Gut microbiota composition and activity influence host metabolism and immune function through mechanisms involving short-chain fatty acids (SCFAs) and bacterial endotoxins (LPS), but causal links are often confounded by environmental factors and relative abundance analysis errors.

Focus on dietary habits and lifestyle factors that support a diverse and active gut microbiome, such as consuming fermentable dietary fibers and maintaining healthy body weight. Be cautious of claims that specific single bacteria are universally 'good' or 'bad'; their effects depend on your diet and health status. Prioritize whole-food diets over isolated probiotic supplements for long-term gut health.

Chronic, low-grade inflammation (inflamm-aging) driven by cytokine dysregulation, oxidative stress, and senescent cells is a primary mechanism underlying aging and age-related diseases such as cardiovascular disease, diabetes, and neurodegeneration.

Focus on lifestyle factors that reduce chronic inflammation: adopt a Mediterranean-style diet rich in omega-3s, engage in regular exercise to upregulate autophagy, and manage stress. These approaches support the body's natural resolution of inflammation rather than just suppressing symptoms.

Senescent cells contribute to aging and age-related diseases through the Senescence-Associated Secretory Phenotype (SASP), which promotes a pro-inflammatory milieu.

While direct 'senolytic' treatments are not yet standard, lifestyle factors that reduce cellular stress (exercise, healthy diet) may help minimize the accumulation of senescent cells.

Epigenetic clocks (DNAmAge) are currently the most robust biological age predictors, strongly correlating with chronological age and independently predicting all-cause mortality, cancer mortality, and various aging phenotypes such as frailty and cognitive decline.

Chronological age is not your destiny. Biomarkers like DNA methylation (epigenetic clocks) show that your body's biological state can differ significantly from your birth year. While you cannot change your birth date, these markers suggest that your health trajectory is influenced by factors like inflammation, immune function, and lifestyle. Monitoring these biological ages (where available) may offer more insight into your health risks than age alone, highlighting the importance of maintaining metabolic health and managing inflammation to potentially slow biological aging.

The accumulation of senescent cells and their Secretory Phenotype (SASP) drives chronic inflammation (inflammaging) and contributes to age-related tissue dysfunction.

Chronic low-grade inflammation is a key driver of aging. Research suggests that this inflammation is partly caused by the accumulation of senescent cells. Therapies that clear these cells have been shown to reduce inflammatory markers in animal models.

Dietary fiber fermentation by gut microbiota produces short-chain fatty acids (SCFAs) which activate specific receptors (GPR41, GPR43, GPR109A) to regulate energy expenditure, lipid homeostasis, and inflammation.

Prioritize diverse sources of dietary fiber to support gut bacteria that produce SCFAs. These microbial byproducts act as signals to regulate your metabolism and reduce inflammation, offering benefits beyond simple caloric intake.

Non-caloric artificial sweeteners (NAS) induce glucose intolerance by altering gut microbiota composition, and these effects can be reversed by antibiotics.

Be cautious with non-caloric artificial sweeteners, as they may negatively impact glucose tolerance by altering your gut microbiome. Opt for whole foods or unsweetened beverages when possible.

DNA methylation clocks are highly accurate molecular correlates of chronological age in humans and vertebrates, but their ability to quantify biological aging rates and test longevity interventions is currently limited by challenges in distinguishing chronological from biological components and understanding underlying mechanisms.

DNA methylation clocks are currently best used as precise tools for estimating chronological age, particularly in forensic or large-scale epidemiological contexts. Their use for evaluating anti-aging interventions is still experimental and requires specialized, tissue-specific clocks rather than general 'pan-tissue' clocks. Individuals should not rely on current commercial epigenetic age tests for making definitive health decisions regarding longevity interventions, as the scientific community acknowledges significant unresolved challenges in distinguishing true biological aging from chronological age effects.

Antibiotic administration, particularly broad-spectrum fluoroquinolones, disrupts the gut microbiome by reducing secondary bile acid-producing bacteria (e.g., C. scindens), which removes the inhibition on Clostridium difficile vegetative growth and leads to infection.

Be cautious with broad-spectrum antibiotics, especially fluoroquinolones, as they can wipe out the specific bacteria that produce secondary bile acids. These bile acids normally inhibit C. difficile. If you must take antibiotics, discuss probiotic or dietary strategies to support your gut microbiome afterward, as this disruption is a primary cause of post-antibiotic diarrhea and CDI.

Specific gut microbiota species and their metabolites (SCFAs, bile acids) actively maintain intestinal barrier integrity and exert anti-inflammatory effects.

Consuming a diet rich in diverse fibers supports the growth of beneficial bacteria that produce SCFAs and strengthen the gut barrier. This is a key strategy for reducing systemic inflammation and supporting metabolic health.

Bacterial cross-feeding is essential for the production of butyrate and propionate from prebiotic substrates like inulin and resistant starch.

A diverse diet with various types of fibers supports a diverse microbiome, which enables cross-feeding. This natural process is more effective at producing beneficial SCFAs than consuming single prebiotic supplements in isolation.

NAD+ metabolism regulates physiological processes and its deficiency contributes to metabolic diseases, cancer, aging, and neurodegeneration.

Maintaining healthy NAD+ levels is crucial for preventing age-related diseases. While the paper focuses on mechanisms, lifestyle factors like exercise and caloric restriction are known to support NAD+ homeostasis. Consider discussing NAD+ precursors with a healthcare provider if you are interested in therapeutic interventions.

NAD+ deficiency contributes to a spectrum of diseases including metabolic diseases, cancer, aging and neurodegeneration disorders.

Maintaining healthy NAD+ levels is crucial for preventing age-related diseases. While the paper focuses on mechanisms, lifestyle factors like exercise and caloric restriction are known to support NAD+ homeostasis. Consider discussing NAD+ precursors with a healthcare provider if you are interested in therapeutic interventions.

The transition from metabolically healthy obesity (MHO) to metabolically unhealthy obesity (MUO) is common, with approximately 30-50% of MHO individuals developing metabolic abnormalities over 3-12 years.

Your 'healthy' metabolic status is not guaranteed to last. Studies show that 30-50% of people with MHO develop diabetes or heart risks within a decade. You should monitor your metabolic markers regularly and maintain physical activity to delay or prevent this transition.

The association between ultra-processed food consumption and cancer risk is not mediated by standard nutritional factors like lipid, sodium, or carbohydrate intake.

This study suggests that the cancer risk associated with ultra-processed foods is not just because they are high in fat, sugar, or salt. Even when accounting for these nutritional factors, the risk persists. This implies that the processing methods, additives, and contaminants in these foods may play a significant role in increasing cancer risk, independent of their basic nutritional content.

Lower LDL-cholesterol levels causally protect against type-2 diabetes, which may explain the increased T2D risk observed with statin therapy.

If you are taking statins for cholesterol, be aware that they may slightly increase your risk of type-2 diabetes. Regular monitoring of blood sugar levels is advisable. Do not stop medication without consulting your doctor, as the cardiovascular benefits often outweigh this risk.

Age-related diseases (ARDs) and geriatric syndromes are not distinct entities but represent accelerated aging trajectories driven by the same molecular mechanisms as normal aging.

Focus on interventions that target shared aging mechanisms (like chronic inflammation and oxidative stress) rather than just treating individual diseases as they appear. This approach, known as geroscience, suggests that slowing aging may prevent or delay multiple age-related conditions simultaneously.

The SenMayo gene set (125 genes) accurately identifies senescent cells across tissues and species, and its expression levels significantly decrease following genetic or pharmacological clearance of senescent cells, serving as a reliable biomarker for senolytic efficacy.

SenMayo is a validated 125-gene signature that can detect senescent cells in various tissues (bone, brain, fat) and track their reduction after senolytic treatments (like Dasatinib + Quercetin). It is currently a research tool for monitoring senolytic efficacy, not a standard clinical test yet.

Metabolic syndrome prevalence in US adults increased significantly from 1988 to 2012, reaching over 34% by 2012, driven by rising obesity, age, and low socioeconomic status.

Your risk of metabolic syndrome is not fixed. The data shows it has been rising for everyone, but it is strongly linked to obesity, age, and income. Focus on maintaining a healthy weight and accessing healthcare early, especially if you are in a lower socioeconomic bracket, to mitigate these risks.

Non-Hispanic black men have a lower likelihood of metabolic syndrome compared to non-Hispanic white men, while non-Hispanic black women have a higher likelihood compared to non-Hispanic white women.

If you are a Black man, your risk is statistically lower than White men, but still significant. If you are a Black woman, your risk is higher than White women. Regardless of race, managing weight and socioeconomic factors (like access to care and healthy food) are critical levers for reducing your personal risk.