According to researchers from the University of New South Wales in Australia, when weight is lost, the majority of it is breathed out as carbon dioxide. Their paper is published in the Christmas issue of The BMJ.
Prof. Andrew Brown and Ruben Meerman reported widespread misconception regarding how weight is lost, finding physicians, dietitians and personal trainers all equally guilty of not knowing. Most believed that fat is converted to energy or heat, “which violates the law of conservation of mass,” they write.
The excess carbohydrates and protein intake are converted into a type of fat called triglyceride. When we try to lose weight, we metabolise these triglycerides while keeping our fat free mass intact.
Exercise increases the amount of carbon that we can lose. Substituting one hour of rest with an hour of moderate exercise increases the metabolic rate by seven times which results into daily additional loss of carbon. On the other hand your weight loss strategy can go wrong if you eat more than the daily requirement. The way to lose weight is the age old solution i.e. “eat less, move more”, as put by the authors.