Metabolism and nutritional adaptation to altered intakes of energy substrates

WP James, G McNeill, A Ralph - The American journal of clinical nutrition, 1990 - Elsevier
Adaptive changes in energy expenditure to changes in energy intake are far less than
previously believed once changes in body weight and physical activity are taken into
account. Alterations in metabolic efficiency of±10% in total energy expenditure are the limits
of what can normally be expected on prolonged under-or overfeeding. The supposed
twofold variation in energy requirements of adults is based on measurements of food intake,
which, despite involving weighted intakes over a week, cannot be considered realistic …