Analysis of 383,085 women finds over 1 in 5 do not know their menstrual cycle length and only 32.4% report a 28-day cycle

Hemoglobin levels that are within the normal range but at the lower end may be beneficial for health

Butyrate extends health and lifespan in mice with mitochondrial deficiency

Pedestrianizing city streets reduces daily noise by 3.1 decibels, a new study of Barcelona’s "green axes" shows

A daily multivitamin slows the ticking of epigenetic clocks

Patients regain weight rapidly after stopping weight loss drugs – but still keep off a quarter of weight lost

Covid-19 vaccines do not increase the risk of sudden cardiac death in younger healthy adults

The Number of Kids You Have May Affect Your Lifespan, Study Finds

COVID-19 vaccination during pregnancy reduces infant hospitalization risk by 50% in the first two months of life

Prolonged sitting is associated with ~16% higher risk of early death and ~34% higher cardiovascular mortality, a large cohort study of 480,000+ adults finds, with risks persisting even after adjusting for lifestyle factors, though regular physical activity may reduce but not eliminate the risk.