APA Dictionary of Psychology

any change made to a diet to include or exclude certain foods or nutrients, often for health reasons. For example, a dietary modification for a person with gout would be to eliminate all foods containing purines, whereas someone beginning to show signs of osteoporosis may make the dietary modification of adding calcium-rich foods as well as vitamins that assist in calcium absorption. A specific dietary intervention is a dietary modification prescribed by a health professional as a treatment for a disease.