From the section marked Intentional Weight loss occurs when an individual is in a state of negative thermodynamic flux when the body is expending more energy i e in work and metabolism than it is consuming i e from food or other nutritional supplements it will use stored reserves from fat or muscle gradually leading to weight loss I think this statement could be made more exact or at least give more exact understanding by inserting the words and excreting between the words expending and more energy I suppose one could argue that excretion of calories is covered by the metabolism in the parentheses but it should have more emphasis than that