People purchase foods based on their income level, their belief in a food's health benefit and cost. However, ethnicity and gender also impact people's food choices, according to researchers at the Johns Hopkins Bloomberg School of Public Health.
The study, published in the March 7, 2007, advance online publication of the European Journal of Clinical Nutrition, reports that food choice is also influenced by environmental factors, such as reliance on fast food, food advertising and food pricing, and on individual factors, such as taste, palatability, convenience and health benefits.
The study sample included 4,356 U.S. adults aged 20-65 years from two nationally-representative cross-sectional surveys conducted by the U.S. Department of Agriculture (USDA)—the Continuing Survey of Food Intakes by Individuals and the Diet and Health Knowledge Survey. The Johns Hopkins Center for Human Nutrition researchers examined diet quality indicators, such as the amount of energy, energy density, total fat and saturated fat in foods consumed by study participants. They also considered the quantity of fruits and vegetables, fiber, calcium and dairy products consumed and the overall quality of people's diet, which was assessed using two indices, including one recommended by the USDA. The key findings are as follows: