While "stopping losing" can only be certain if there is no fat loss over a period of 2 months or more, the way to find it out is monitoring your body fat % (by skin calipers). This number also gives the information about what kind of training and diet you must follow to get to the desired body fat %. It may be that you are already at a normal body fat %, and if you wanted to go still lower, you would need more drastic measures like those of body builders. Most people would not want to take such measures, except competitive body builders.
It may also be due to a much simpler problem: That your caloric deficiency is not as large because you got used to your exercises. To keep losing, you would need to overhaul your entire exercise regimen, choosing exercises that you have never done. For example, if you are a steady, long distance runner, and never actually sprint, you might have to take up HIIT. Or if you have been into HIIT, you might want to introduce long distance running. If you are not doing any heavy lifting, you might want to introduce that too.
Edited by: MPLANE37 at: 3/28/2013 (13:57)