A new study suggests it doesn't take long for a diet free of animal products to slow biological aging rates, with the heart, liver, and hormonal and inflammatory systems all benefitting from the temporary change. Led by a team from the Stanford University School of Medicine, the study analyzed the rate of DNA methylation; a kind of reversible genetic modification which is often used as an indicator of how quickly the body is wearing out. Among a group of 21 pairs of identical twins, one of each pair adhered to a vegan diet over the course of eight weeks, while...