The CARDIA (Coronary Artery Risk Development in Adulthood) study began with thousands of healthy 18- to 30-year-olds; many were reexamined 7 to 20 years later. The study found that .

those who were the least fit at the first assessment were four times more likely to have diabetes and high blood pressure in middle age.

Explanation:

Coronary Artery Risk Development in Young Adults (CARDIA) study is usually being conducted in order to reveal possible factors that start in early adulthood which could set the stage for the development of cardiovascular diseases.  

In 1983, the study was funded over a five-year period and it commenced with a group of 5,115 people (both black and white men and women) aged 18 to 30 years.