Dietary variety, energy regulation, and obesity

Increased variety in the food supply may contribute to the development and maintenance of obesity. Thirty-nine studies examining dietary variety, ener gy intake, and body composition are reviewed. Animal and human studies show that food consumption increases when there is more variety in a meal or di et and that greater dietary variety is associated with increased body weigh t and fat. A hypothesized mechanism for these findings is sensory-specific satiety, a phenomenon demonstrating greater reductions in hedonic ratings o r intake of foods consumed compared with foods not consumed. Nineteen studi es documenting change in preference, intake, and hedonic ratings of food af ter a food has been eaten to satiation in animals and humans are reviewed, and the theory of sensory-specific satiety is examined. The review conclude s with the relevance of oral habituation theory as a unifying construct for the effects of variety and sensory-specific satiety, clinical implications of dietary variety and sensory-specific satiety on energy regulation, and suggestions for future research.