People who regularly fast are familiar with the typical fasting or diet odour, which is reminiscent of nail polish remover. The trigger for this unpleasant body odour is the partial reduction of body fat caused by a lack of carbohydrates. The body needs at least 50 g of carbohydrates a day to be able to convert fat into glucose.
If not, the body forms ketones which are exhaled in the form of strong-smelling acetone. This odour-related consequence is also evident with low carbohydrate diets.