The obesity crisis in today’s society is the result of simple math, it’s a calories-in calories-out calculation. Anything you eat beyond your immediate need for energy converts to fat. A cup of milk and a croissant (equivalent to 250Kcal) consumed everyday exceeding your daily nutritional needs can lead to an increase in your weight of approximately 12kg (26.4lbs) a year.
Measuring your metabolism is easy and fast. Just breathe normally inside a disposable/single use mask for 15 minutes and that’s it. You will get the actual amount of calories your body burns at rest.