The present disclosure relates to the treatment, e.g. reduction, of body fat mass levels for example in overweight and obese subjects. The present disclosure also relates to weight control in a subject where obesity should be avoided. Disclosed herein are methods of reducing body fat mass e.g. reducing obesity or preventing weight gain and agents used in such methods whereby the agents inhibit a sulphur containing amino acid. Also included in the present disclosure include, without being limited to, methods for determining regimes for the treatment of obesity as well as other subject matter.
