ABSTRACT
This chapter derives a new thermodynamic energy balance model and shows how the new model can be used to calculate energy intake (EI). In 1973, Efforts to predict weight change from a change in energy intake or energy expenditure date as far back as 1952 when Max Wishnofsky assumed a linear formulation for weight prediction. The often used rule of a pound lost for each 3500 kcal reduction in cumulative energy intake is appropriate only for short-term projections of weight change. The Antonetti–Thomas energy balance model provides a simple, flexible, and scalable method to apply at either the individual or population-wide level to calculate EI objectively. Physical activity energy expenditures (EEPA) was represented as a direct proportion of body weight, EEPA = KaW. The chapter provides an uncomplicated alternative method that relies on our simple validated thermodynamic model that can be directly expressed in closed form.
