Browse the evidence

Pyruvate dehydrogenase (PDH) transformation scales directly with exercise power output and closely matches the flux of carbohydrate oxidation into the mitochondria.

As you increase your cycling intensity from moderate to high (up to 90% VO2max), your body increasingly activates the PDH enzyme to process carbohydrates for energy. This activation scales with your effort, ensuring that the more you push, the more efficiently your mitochondria can use the pyruvate generated from glycogen.

Plasma levels of CRAMP, EF-1α, stathmin, and chitinase enzyme activity serve as biomarkers for human aging and diseases associated with telomere shortening, correlating with biological age and disease severity.

If you are concerned about biological aging or chronic diseases like cirrhosis or MDS, blood tests measuring CRAMP, EF-1α, stathmin, and chitinase activity can provide a more accurate assessment of your biological age and disease risk than chronological age or standard markers like IL-6. These biomarkers increase with age and disease severity, offering a tool for personalized therapy planning.

Gut microbiota dysbiosis, characterized by decreased diversity and increased Proteobacteria, contributes to the pathogenesis of NAFLD by disrupting intestinal permeability and promoting hepatic inflammation via the gut-liver axis.

Focus on gut health as part of liver health. A diet high in fiber and low in processed additives may support a healthy microbiome, potentially reducing the risk of NAFLD progression. Probiotics and prebiotics are mentioned as potential therapeutic strategies.

Cyclical variation in heart rate (bradycardia during apnea, tachycardia upon arousal) combined with ECG waveform morphology changes (R and T wave amplitude modulation) can reliably detect obstructive sleep apnea (OSA).

For diagnosing sleep apnea, relying solely on oxygen saturation is insufficient due to physiological delays. A more reliable approach involves analyzing the cyclical heart rate changes (diving reflex) and ECG waveform morphology (R/T wave amplitude shifts) caused by respiratory effort.

Respiratory sinus arrhythmia (RSA) is significantly smaller in REM sleep compared to Non-REM sleep.

When analyzing sleep data, expect lower respiratory sinus arrhythmia (the coupling of breathing and heart rate) during REM sleep compared to Non-REM sleep.

In patients with insomnia disorder, hyperconnectivity within the anterior default mode network (DMN) and increased connectivity between the salience network (SN) and the anterior DMN underlie affective symptoms and hyperarousal.

For insomnia patients, this research suggests that the problem is not just 'trying to sleep' but involves specific brain networks (DMN and Salience Network) that are hyperactive and failing to deactivate. This supports interventions like Cognitive Behavioral Therapy for Insomnia (CBT-I) which aim to reduce this cognitive and emotional hyperarousal, rather than just focusing on sleep environment or supplements.

In patients with Obstructive Sleep Apnea (OSA), cognitive and depressive symptoms are linked to dysfunctional connectivity within the posterior default mode network (DMN) and its disconnection from the frontoparietal network.

For OSA patients, cognitive issues like memory loss or brain fog are not just because they are tired; they are linked to changes in the brain's 'default mode network'. This highlights the importance of consistent OSA treatment (like CPAP) to potentially reverse or mitigate these network disruptions, and suggests that cognitive symptoms may persist even if daytime sleepiness is managed.

Shorter blood telomere length (BTL) is associated with increased all-cause mortality risk in middle-aged individuals, whereas this association is absent or reversed in ultra-elderly populations (75+ years).

Blood telomere length (BTL) measurement can serve as a biomarker for mortality risk, but its interpretation is strictly age-dependent. For middle-aged adults (45-64), shorter telomeres correlate with higher mortality risk. However, for those over 75, this correlation disappears or reverses, likely due to survivor effects and biological changes in aging. Therefore, BTL should not be used as a standalone universal predictor of longevity without considering the patient's age cohort.

Surgical weight loss via Roux-en-Y gastric bypass resolves the chronic disability of clinically severe obesity, restoring health status scores to or above national norms across physical, mental, and social domains.

If you have clinically severe obesity, your health status is likely significantly impaired across physical, mental, and social domains, not just in weight numbers. Surgical intervention like Roux-en-Y gastric bypass can resolve this disability, often restoring your quality of life to levels equal to or better than the average non-obese population. This is a medical treatment for a chronic disease, not a cosmetic procedure.

Higher scores on five distinct dietary indices (Nutrition Index, E-DII, HEI-2015, MDS, DASH) are significantly associated with increased risk of frailty and higher 8-year mortality risk in adults across all ages.

Adhere to established healthy dietary patterns such as the Mediterranean, DASH, or HEI-2015 guidelines. These patterns, which emphasize fruits, vegetables, whole grains, and healthy fats while limiting processed foods and added sugars, are associated with a lower risk of frailty and mortality. You do not need to track every nutrient; focusing on the overall quality of your diet is sufficient to gain these benefits.

Acute resistance exercise and endurance exercise produce distinct, mode-specific plasma metabolomic signatures, with resistance exercise preferentially increasing nucleotide breakdown products and lactate, while endurance exercise preferentially increasing lipid metabolites and ketone bodies.

To maximize specific health benefits, choose your exercise mode intentionally. If you want to improve fat oxidation and ketone production, prioritize endurance exercise. If your goal is to enhance glycolytic capacity and nucleotide turnover (often linked to strength and power), prioritize resistance exercise. Doing both covers a broader metabolic spectrum.

Inulin supplementation increases the abundance of Bifidobacterium, but this increase is a signature of intake rather than a direct driver of the observed metabolic improvements.

Don't assume that just because inulin boosts Bifidobacterium, that this specific bacteria is responsible for your health benefits. The actual metabolic improvements are linked to other changes in your gut bacteria, such as a decrease in Desulfovibrio and Clostridium sensu stricto.

Elevated circulating levels of branched-chain amino acids (BCAAs) and fatty acids (FAs) induce insulin resistance and metabolic dysfunction by promoting mitochondrial dysfunction and activating pro-inflammatory signaling pathways (NF-κB and NLRP3).

High levels of BCAAs and fatty acids in your blood are linked to insulin resistance and inflammation, which drive metabolic diseases. This often happens when your body struggles to process these nutrients (common in obesity or T2D) rather than just from eating them. Focus on improving metabolic flexibility and insulin sensitivity through exercise and balanced nutrition rather than assuming high BCAA/Fat intake is always beneficial.

Senescent human cells in vivo can be identified and quantified using a biomarker for senescence-associated beta-galactosidase (SA-β-Gal) activity at pH 6, which correlates with replicative age and accumulates in aging skin.

This research establishes a reliable method to identify senescent cells in human tissue using a specific enzyme activity (SA-β-Gal at pH 6). It confirms that these cells accumulate in the skin with age, providing a biological basis for age-related changes. For longevity research, this biomarker is a critical tool for validating interventions aimed at clearing senescent cells (senolytics) or preventing their accumulation.

The sugar industry successfully influenced the 1971 National Caries Program (NCP) to prioritize interventions that reduce the harm of sugar consumption (e.g., fluoride, dextranases, vaccines) over restricting sugar intake, thereby deflecting attention from the causal role of sucrose in dental caries.

Be skeptical of public health initiatives that focus on 'harm reduction' technologies (like additives or enzymes) while ignoring the need to limit sugar intake. If an industry group promotes a technical solution that allows continued high consumption of a product, scrutinize their motives, as they may be trying to avoid stricter regulations on consumption.

Higher dietary resistant starch intake is NOT significantly associated with reduced cardiovascular disease (CVD) mortality.

Do not rely on resistant starch alone to protect your heart. This study found no significant link between RS intake and reduced cardiovascular mortality. While RS may offer other benefits, managing overall cardiovascular risk requires a holistic approach including blood pressure, lipid management, and overall diet quality, not just increasing RS.

There is no statistically significant association between weight loss (amount or frequency) and cancer mortality in men or women.

Losing weight, whether once or repeatedly, does not appear to reduce your risk of dying from cancer based on this study. Focus on other aspects of health.

Fecal Microbiota Transplantation (FMT) from lean donors does not result in significant weight loss or improved metabolic health in humans with obesity, despite showing benefits in some animal models.

Do not pursue FMT for weight loss at this time, as human trials have not shown benefit. Focus on dietary interventions which are more accessible and have stronger evidence for long-term health.

Perivascular Fat Attenuation Index (FAI) measured via cardiac CT serves as a biomarker for coronary inflammation and predicts cardiac mortality, with values above -70.1 HU indicating a 6- to 9-fold higher adjusted risk of future cardiac mortality.

If you are getting a heart scan for chest pain, ask your doctor about the Fat Attenuation Index (FAI). This AI-enhanced measurement looks at the fat around your heart arteries to detect hidden inflammation. A high FAI score means your risk of a heart event is much higher, even if your arteries don't look blocked yet. This helps doctors treat you before a major problem occurs.

Continuous postoperative pulse oximetry (CPOX) monitoring without preoperative obstructive sleep apnea (OSA) screening is a safe and effective perioperative strategy for bariatric patients.

For bariatric patients, skipping preoperative sleep testing and relying on continuous pulse oximetry monitoring after surgery is a safe alternative. This approach avoids the cost and time of preoperative screening while maintaining low complication rates, provided patients receive supplemental oxygen and monitoring during the first postoperative night.

Large-scale community-based screening for type 2 diabetes using survey-based risk scores or random glucose testing in India generates a massive burden of false positives (ratios of 3.9 to 8.2 false positives per true positive), creating significant health system costs without proportional health benefits.

For policymakers and health system administrators in India: Do not implement large-scale community screening using current survey-based tools or random glucose tests without ensuring robust, affordable confirmatory testing infrastructure. The current approaches generate massive numbers of false positives, overwhelming the health system with costs ranging from $169 million to $567 million, with little gain in early detection compared to direct fasting glucose testing.

Circulating levels of trans-16:1n9 and total trans-18:1 are not significantly associated with total mortality or cardiovascular disease mortality in older adults.

You do not need to avoid natural sources of trans fats (like those found in dairy and meat) which contain t-16:1n9 and t-18:1, as this study found no link to increased mortality or heart disease risk. Focus your efforts on avoiding industrial trans fats (partially hydrogenated oils) instead.

Higher genetically predicted BMI does not increase the risk of cancer mortality.

While higher BMI increases risks for other causes of death, this study did not find a link to cancer mortality.

In people with suppressed HIV and metabolic dysfunction-associated fatty liver disease (MAFLD), adjunctive treatment with maraviroc, metformin, or their combination for 48 weeks does not significantly reduce liver fat fraction compared to antiretroviral therapy alone.

If you have HIV and fatty liver, adding maraviroc or metformin to your standard HIV treatment is unlikely to reduce the fat in your liver. The trial showed no significant benefit for liver fat reduction compared to just staying on your HIV medication. Focus on proven lifestyle strategies for metabolic health.