Calcium and dairy intake: Longitudinal trends during the transition to young adulthood and correlates of calcium intake.
OBJECTIVE
To describe changes in calcium and dairy intake during the transition from middle adolescence to young adulthood and to identify baseline correlates of calcium intake in young adulthood.


METHODS
Population-based, 5-year follow-up study (Project EAT: Eating Among Teens).


METHODS
Baseline surveys were completed in Minneapolis/St. Paul, MN schools and by mail at follow-up.


METHODS
Males and females (N = 1521) attending high school at baseline (mean age = 15.9 years) and with a mean age of 20.5 years at follow-up.


METHODS
Calcium intake.


METHODS
Mixed and linear regression methods were used to respectively examine trends and correlates of intake.


RESULTS
During the transition to young adulthood, mean daily calcium intakes of females and males decreased by an average of 153 mg and 194 mg respectively. Mealtime milk availability, health/nutrition attitudes, taste preference for milk, healthful weight control behaviors, and peer support for healthful eating at baseline were associated with better follow-up calcium intake. Time spent watching television and lactose intolerance were associated with lower intake at follow-up.


CONCLUSIONS
Nutrition interventions are needed to counter longitudinal decreases in calcium intake. Interventions targeted to adolescents should address the availability of milk at meals and other identified supports for healthful eating.
Larson
Nicole I
NI
University of Minnesota, Minneapolis, 55454, USA. larsonn@umn.edu
Neumark-Sztainer
Dianne
D
Harnack
Lisa
L
Wall
Melanie
M
Story
Mary
M
Eisenberg
Marla E
ME
D000293:Adolescent; D000818:Animals; D001294:Attitude to Health; D050071:Bone Density Conservation Agents / Q000008:administration & dosage*; D002136:Calcium, Dietary / Q000008:administration & dosage*; D002755:Choice Behavior; D003611:Dairy Products; D005260:Female; D005500:Follow-Up Studies; D005518:Food Preferences; D015438:Health Behavior; D006801:Humans; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D008892:Milk; D008910:Minnesota; D010024:Osteoporosis / Q000517:prevention & control; D055815:Young Adult
D050071:Bone Density Conservation Agents; D002136:Calcium, Dietary