Demographic Chatactezistics Subjects (n=87)
Age (years) 25 ± 4
Sex (male) 87
BMI (Kg/m2) 23.2 ± 2.0
Ethnicity Caucasian 52
African American 20
Latin-American 15
Physical activity (hours/week) 12
Multivitamin  
Yes 20
No 67
Recent visit sunny country  
Yes 2
No 85
Table 1: Characteristics of study subjects (data are presented as means ± standard deviation or absolute figures)