Cutting Carbohydrates Might Also Cut Lifespan Cutting carbohydrates might also cut lifespan by up to four years, according to a new medical study. The peer-reviewed research published in the medical journal "The Lancet Public Health" suggests low and high-carb diets could shorten life, and diets including some carbs could promote a healthy lifespan. The study analyzed self-reported data from more than 15,400 middle-aged Americans who participated in the Atherosclerosis Risk in Communities Study. The dietary patterns researchers found were compared against additional studies that included 432,000 people in more than 20 countries. Researchers concluded that people who ate a moderate amount of carbohydrates lived four years longer than those with low-carbohydrate consumption and one year longer than those who ate a lot of carbohydrates.