Children who follow key healthy lifestyle recommendations at age 10 and 11 are much less likely to be diagnosed with attention-deficit/hyperactivity disorder (ADHD) by age 14. In one of the first investigations of its kind, the study of more than 3000 fifth-grade students in Nova Scotia, Canada, showed that those who met at least seven of nine healthy lifestyle recommendations had a substantially lower incidence of ADHD compared to their counterparts who only met between one and three of the criteria.