The dietary choices of parents may not have a significant influence on children's eating habits, according to researchers at the Johns Hopkins Bloomberg School of Public Health.
Their challenge to the age-old belief is based on an examination of dietary intakes and patterns among U.S. families, which found that the resemblance between children's and their parents' eating habits was weak.
"Child-parent dietary resemblance in the U.S. is relatively weak, and varies by nutrients and food groups and by the types of parent-child dyads and social demographic characteristics such as age, gender and family income," said Dr. Youfa Wang, senior author of the study and associate professor with the Bloomberg School's Center for Human Nutrition.
"When looking at overall diet quality, parent-child correlation in healthy eating index score was similar for both younger and older children. To our knowledge, this is the first such study that examined the similarities between children's and their parents' dietary intakes in the United States based on nationally representative data.
Our findings indicate that factors other than family and parental eating behaviors may play an important role in affecting American children's dietary intakes," Dr. Wang added.
The research team examined data from the U.S. Department of Agriculture (USDA) Continuing Survey of Food Intakes by Individuals, a nationally representative multi-stage sample of 16,103 people containing information about dietary intake, socio-economic, demographic and health parameters surveyed from 1994 to 1996.
Average dietary intake and dietary quality indicators were assessed using two 24-hour dietary recalls provided by study participants.
The researchers also assessed the overall quality of the participating children's and their parents' diets based on the USDA 2005 Health Eating Index (HEI) along with a number of other covariates.
According to them, the correlations between children's and their parents' HEI scores ranged from 0.26 to 0.29 across various child-parent dyads, such as mother-daughter and father-son.
For total energy intake they were 0.14 to 0.29, while for fat intake -0.04 to 0.28.
The researchers say that the range of the correlation measure is between -1 and 1, while 0 means no resemblance and 1 indicates a perfect resemblance.
The team also found some differences in the resemblance between different types of child-parent dyads and nutrient intakes, and by children's age and family income.
"Factors other than parental eating behaviors such as community and school, food environment, peer influence, television viewing, as well as individual factors such as self-image and self-esteem seem to play an important role in young people's dietary intake," said Dr. May A. Beydoun, co-author of the study and a former postdoctoral research fellow at the Bloomberg School.
"Our findings have a number of important public health implications. In particular, the overall weak to moderate parent-child resemblance in food groups, nutrients and healthy eating index scores suggest that interventions targeting parents could have only a moderate effect on improving their children's diet.
Nevertheless, based on our findings stratified by population groups, for interventions targeting parents, those would be more effective when targeted at mothers, minority groups, and as early as possible in childhood. We suspect that the child-parent resemblance in dietary intake may have become weaker over time, due to the growing influence of other factors outside of the family," said Wang.
The study has been published in the journal Social Science and Medicine.