Why diets fail: a hypothesis for discussion

Abstract

Weight regulation depends on the difference between weights of absorbed and metabolised carbon and excretion of the end products of metabolism, calories and carbon dioxide, which can be independently and variably excreted. Calories can be variably excreted as heat by vasoconstriction or vasodilation and carbon dioxide can be excreted variably as exhaled carbon dioxide (the major route of carbon excretion). Unless there are changes in ventilatory carbon excretion, 'metabolism,' 'genetic factors,' 'hormones' or 'exercise' do not provide complete explanatory mechanisms for weight changes, obesity and failure of diets. Low sensitivity of respiratory centres to carbon dioxide may cause overweight and dietary failures after initial weight loss.

Why diets fail: eating more, moving less

“…We thank Dr Welsby for reminding readers that weight loss occurs by the excretion of atoms, not energy (calories) 1. However, we worry that his inchoate hypothesis will only add further confusion to an area that already bewilders the general public and health professionals alike.…”