A new Lancet Public Health study suggests that people on diets consisting of moderate amounts of carbohydrates (as opposed to low or high carb diets) have the lowest mortality.
In a study of over 15,000 U.S. adults who were followed for about 25 years after completing food diaries, the lowest mortality risk occured in people with carbohydrate intakes of 50%–55% of daily calories. The highest mortality risk was seen in people with the lowest carbohydrate intake. People with the highest carb intake experienced mortality in between the two other groups. The authors conclude that diets that replace carbs with animal-based fats and proteins should be discouraged. However, replacement of carbohydrates with predominantly plant-based fats and proteins reduced mortality risk and “could be considered as a long-term approach to promote healthy aging."
An earlier Lancet study from 2017 also suggests that replacing some carbs with fats may reduce mortality. - Sanders DiPiero