Browse the evidence

Short-term reduction in daily physical activity (step reduction) induces peripheral insulin resistance and ectopic fat accumulation (liver and visceral adipose tissue) in young, healthy adults within 14 days.

Even if you are young and healthy, dropping your activity level significantly (e.g., from 10,000 to 1,500 steps/day) for just two weeks can cause your body to store fat in the liver and become less sensitive to insulin. This happens even if your total body weight doesn't change. To prevent this, try to maintain your usual activity level or incorporate light movement during periods of reduced activity.

Short-term physical inactivity causes a significant loss of muscle mass (1-4%) in older adults within 14 days, accompanied by anabolic resistance.

If you are over 65, even a short period of reduced activity (like 14 days of low steps) can cause you to lose 1-4% of your muscle mass. This happens because your muscles become less responsive to protein (anabolic resistance). To protect your muscle, try to stay active even if you can't do intense exercise, and ensure you are eating enough protein.

The metabolic and musculoskeletal effects of short-term physical inactivity are reversible in younger adults but less so in older adults.

If you are young, you can likely reverse the negative metabolic and muscle effects of a few weeks of inactivity by returning to your normal routine. If you are older, recovery may be slower and less complete. It is more important for older adults to avoid long periods of inactivity in the first place.

The BodyTime assay, which estimates internal circadian time from a single blood sample using a small set of transcript biomarkers, achieves accuracy comparable to the gold standard dim-light melatonin onset (DLMO) method while being significantly less costly and time-consuming.

If you are interested in optimizing the timing of medications or health interventions (chronotherapeutics), you can now determine your internal circadian phase with a single blood test (BodyTime assay). This test is as accurate as the traditional gold standard (melatonin testing) but is much faster, cheaper, and does not require special lighting conditions. This allows for personalized timing of treatments based on your unique biological clock.

GLP-1 receptor agonists reduce blood pressure and improve lipid profiles (LDL-C, triglycerides), contributing to the stabilization of atherosclerotic plaques and reduced cardiovascular risk.

GLP-1RAs help lower blood pressure and improve cholesterol levels, which protects your arteries from plaque buildup. This is an added benefit beyond blood sugar control, helping to prevent heart attacks and strokes.

GLP-1 receptor agonists exhibit protective effects on the kidneys by reducing the decline in estimated glomerular filtration rate (eGFR) and delaying the onset of proteinuria in patients with Type 2 Diabetes.

GLP-1RAs help protect your kidneys from damage caused by diabetes. They slow down the loss of kidney function and reduce protein leakage into the urine, which is crucial for long-term kidney health.

Pitolisant (5-20 mg/day) significantly reduces self-reported excessive daytime sleepiness and fatigue in patients with moderate-to-severe obstructive sleep apnea who refuse or are non-adherent to CPAP therapy, without improving objective maintenance of wakefulness.

If you have moderate to severe sleep apnea but cannot or will not use CPAP, pitolisant (5-20mg daily) can significantly reduce your daytime sleepiness and fatigue. It does not fix the breathing pauses or objectively improve your ability to stay awake in a lab test, but it does make you feel less sleepy and improves your quality of life. It is generally safe with side effects similar to placebo.

Exercise acts as a non-pharmacological intervention that counteracts age-related insulin resistance by enhancing mitochondrial oxidative capacity, improving autophagy, and reducing oxidative stress and inflammation.

Regular exercise is one of the most effective ways to combat age-related insulin resistance. It improves your muscles' ability to use energy, clears out cellular waste, and reduces inflammation, keeping your insulin sensitivity high.

Testosterone treatment in older men with low testosterone improves walking distance and perceived mobility, although the effect on slow walkers is small.

Testosterone therapy may slightly improve your walking distance and perceived mobility, especially if you are not a slow walker. The effect is small, but it may still be clinically important for maintaining independence. The treatment involves daily application of a gel, with dose adjustments to keep levels in the normal range for young men.

Long-term daily consumption of heat-inactivated Lactobacillus gasseri CP2305 tablets significantly reduces anxiety and sleep disturbance in healthy young adults under chronic stress, while improving objective sleep metrics and modulating gut microbiota.

If you are under chronic stress, taking a daily supplement of heat-inactivated Lactobacillus gasseri CP2305 (specifically strain CP2305) for at least 24 weeks may help lower anxiety and improve sleep quality. Ensure you avoid other probiotic-rich foods or supplements during this period to isolate the effect.

Hot flashes (vasomotor symptoms) are a major contributor to sleep disturbances during the menopausal transition, with HF-associated wake time significantly contributing to overall wakefulness after sleep onset (WASO).

If you are experiencing sleep issues during menopause, recognize that hot flashes are a primary driver of fragmented sleep. This is a physiological response to hormonal changes, not just 'aging'. Treating the hot flashes (via hormonal or non-hormonal options) often improves sleep quality, which is crucial for long-term health.

Menopausal stage (early/late transition, postmenopause) is associated with increased odds of self-reported sleep difficulties, particularly frequent awakenings, independent of age.

Track your sleep relative to your menopausal stage. If you are in perimenopause or postmenopause, expect a higher likelihood of sleep issues like frequent awakenings. This is a statistical norm, not a personal failure. Proactive management (CBT-I, treating HFs) is recommended.

Surgical menopause (bilateral oophorectomy) is associated with more severe sleep disturbances and higher prevalence of sleep difficulty compared to natural menopause, largely due to more severe hot flashes.

If you had your ovaries removed, expect more severe sleep issues than natural menopause. Discuss Hormone Therapy (HT) with your doctor if not contraindicated, as it improves sleep. If HT is not an option, CBT-I and non-hormonal medications are effective alternatives.

Both short (<6-7 hours) and long (>9 hours) sleep durations are associated with an increased risk of developing type 2 diabetes mellitus (T2DM) and gestational diabetes mellitus (GDM), with short sleepers having approximately 2 times higher odds of prediabetes/T2DM and long sleepers having 60% higher odds compared to normal sleepers (7-8 hours).

Aim for 7-8 hours of sleep per night. Both short sleep (<6-7 hours) and long sleep (>9 hours) are associated with a higher risk of developing type 2 diabetes. Maintaining a consistent and adequate sleep duration is important for metabolic health and diabetes prevention.

The AMPKα1 isoform plays a critical role in stimulating anabolism and regulating satellite cell dynamics during muscle regeneration, distinct from the catabolic role of AMPKα2.

Muscle repair after injury relies on specific molecular signals (AMPKα1) that are different from those that limit growth during stress. While general AMPK activation can hinder growth, the specific activation of the α1 isoform is necessary for stem cells to repair damage. This suggests that recovery protocols should support, not suppress, this specific signaling pathway.

PPARγ agonist pioglitazone significantly reduces the risk of major cardiovascular events (stroke and myocardial infarction) in patients with type 2 diabetes and high cardiovascular risk, including those with prediabetes.

If you have type 2 diabetes and are at high risk for heart issues, ask your doctor about pioglitazone. It has been shown in multiple studies to significantly lower the risk of stroke and heart attack, even in people with prediabetes. While it can cause side effects like weight gain or swelling, the cardiovascular protection it offers is substantial for high-risk individuals.

PPARα agonists (fibrates) significantly reduce cardiovascular events and myocardial infarction in subjects without existing cardiovascular disease, making them effective for primary prevention.

If you have high triglycerides or dyslipidemia but no heart disease, ask your doctor if a fibrate like fenofibrate or bezafibrate is right for you. Studies show these drugs can significantly reduce your risk of heart attacks and other cardiovascular events, offering protection beyond just lowering cholesterol.

Intensive insulin therapy in Type 1 Diabetes causes significant weight gain, which subsequently increases the risk of cardiovascular disease and metabolic complications.

If you have Type 1 Diabetes, intensive insulin therapy is necessary for survival and complication prevention, but it will likely cause weight gain. Do not restrict insulin to control weight, as this leads to dangerous hyperglycemia and increased mortality. Instead, work with your care team to manage weight through lifestyle adjustments and potentially adjunctive therapies that do not compromise glycemic control.

The Triglyceride-Glucose (TyG) index provides accurate discrimination of prediabetes and diabetes, performing comparably to the gold-standard HOMA-IR marker, particularly in women and individuals under 65 years of age.

If you are concerned about prediabetes, ask your doctor to calculate your Triglyceride-Glucose (TyG) index using your standard fasting glucose and triglyceride levels. This index is a reliable, low-cost screening tool for insulin resistance and diabetes risk, especially for women and those under 65, potentially saving you the cost and discomfort of an oral glucose tolerance test.

Regular physical activity improves cortisol and dehydroepiandrosterone (sulphate) levels in older adults, contributing to healthy ageing.

Engage in regular physical activity, such as moderate-intensity exercise, to help regulate stress hormones like cortisol and DHEA(S), which supports healthy ageing and reduces frailty risk in older adults.

Daily supplementation with 2000 IU of Vitamin D3 reduces the incidence of advanced (metastatic or fatal) cancer in adults without prior cancer diagnosis, with the effect being statistically significant only in individuals with a normal body mass index (BMI < 25).

If you are maintaining a healthy weight (BMI < 25), taking 2000 IU of Vitamin D3 daily may help reduce your risk of developing advanced or fatal cancer. However, if you are overweight or obese, this specific dose may not provide the same protective benefit against advanced cancer, likely due to how fat stores sequester the vitamin. Consult your doctor before starting, especially if you have existing health conditions.

Obesity accelerates biological aging across multiple physiological systems, including telomere shortening, epigenetic drift, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, deregulated nutrient sensing, and chronic inflammation, thereby reducing healthspan and lifespan.

Maintaining a healthy body weight is not just about preventing specific diseases like diabetes or heart disease; it is a critical factor in slowing down the biological aging process itself. By avoiding obesity, you protect your telomeres, epigenetic markers, and cellular health, potentially extending your healthspan.

Time-restricted feeding (TRF) restricted to an early window (e.g., 6 hours ending before 3 PM) improves metabolic health markers (insulin sensitivity, blood pressure, oxidative stress) in humans independent of weight loss, whereas late TRF or unrestricted late eating worsens glucose tolerance and metabolic profiles.

If you are prediabetic or overweight, try restricting your eating window to 6-8 hours, ensuring your last meal is finished by 3 PM. This specific timing improves insulin sensitivity and blood pressure without requiring weight loss. Avoid eating late in the evening (after 4 PM), as this worsens glucose tolerance regardless of total calories. If you cannot eat early, focus on reducing late-night snacking and aligning meals closer to your natural melatonin onset.

Circadian misalignment, such as that caused by shift work, jet lag, or forced late eating, induces metabolic dysfunction including insulin resistance, increased blood pressure, and altered glucose tolerance, even in healthy lean individuals.

Avoid eating close to bedtime or during your biological night. If you work shifts or travel across time zones, prioritize aligning your meals with your local daylight hours as much as possible. Even short-term misalignment can rapidly impair glucose tolerance, so consistency in timing is as important as content.