Excess weight gain occurs when more calories are consumed than expended over a long period of time. Accurate translation between changes in calories and changes in weight is important for setting goals and for evaluating interventions at both the individual and population levels. For years, a simple rule of thumb has been used for predicting weight change: 3,500 calories equals one pound of body weight change. However, emerging research demonstrates that the math is not that straightforward, and the 3,500-calorie rule will create overly optimistic predictions of weight loss, oftentimes being in error by many fold. This brief presents new mathematical models that can be used to calculate the impact of calories on body weight in both adults and children, and several useful rules of thumb that can estimate changes at the population level. These models suggest that the obesity epidemic was driven by much larger changes in calorie intake than previously believed and will require aggressive strategies to reverse.
From Calories to Weight Change in Children and Adults: The State of the Science
This research brief summarizes findings from an exploratory study of a diverse sample of juvenile justice residential facilities in North Carolina conducted by RTI International. The study examined food service operations, agency and facility level policies and practices pertaining to nutrition, participation in federal school nutrition programs, and additional food … More
Researchers and advocates have drawn attention to the public health consequences of mass incarceration and its contribution to racial health disparities in the United States. The conditions within juvenile justice facilities may influence long-term health outcomes for African-American, Latino, and Native American populations, who are more likely than white youth … More
Farm-to-School Education Grants Reach Low-Income Children and Encourage Them to Learn About Fruits and Vegetables
For children from low-income families, school meals are a significant portion of daily caloric intake and hence an opportunity to address food insecurity. Many states have pursued legislation to institutionalize programs such as farm to school that aim to improve the quality of school meals and acceptance of healthy foods … More