Lifestyle factors, diet and attention-deficit/hyperactivity disorder in Spanish children - an observational study.

Background: The aetiology of Attention Deficit Hyperactivity Disorder (ADHD) continues to be debated, although several contributing factors have been acknowledged.Objective: Assess the association between weight, birth attributes, exercise and sleep habits, dietary intake and adherence to a Mediterranean diet, and impulsive behaviour on Spanish ADHD children. Establish whether specific food groups (not just adherence to the Mediterranean diet) associate with impulsive behaviour.Methods: This observational cross-sectional study included 57 ADHD children from Madrid (Spain). Demographic, clinical data, sleep, exercise and technology-use habits were obtained. Anthropometric measurements included height and weight. Adherence to the Mediterranean diet was assessed using the KIDMED test. Barratt Impulsivity Scale version-11c was used to assess impulsivity. Subjects were divided into three groups for analysis, according to their age (6-10 years, children; 11-13 years, pre-adolescents; 14-16 years, adolescents).Results: There were clear associations between those who had higher BIS scores and who slept less at weekends (49.4 ± 10.16 vs. 43.8 ± 12.51), who adhered poorly to the Mediterranean diet (49.9 ± 11.72 vs. 41.6 ± 16.52), who used internet and technological devices for >3 h/day (45.5 ± 13.6 vs. 44.7 ± 12.11), who were born with >2.5 kg (46.1 ± 11.61 vs. 42.9 ± 15.29), who were delivered by caesarean (45.1 ± 12.78 vs. 44.7 ± 12.5) and who were not breastfed (45.0 ± 13.38 vs. 44.8 ± 12.39). Subjects exercising more than 3 days a week also scored slightly higher (45.4±14.02 vs. 44.6±11.85) in the BIS.Conclusion: There is a need to follow up the link between ADHD and sleep onset difficulties, dietary patterns, technological habits, perinatal factors, breastfeeding and birth delivery mode.