In the 3 or so months of BJJ I have:
1. Lost 23 pounds.
2. I am more conscious of what I eat. Doesn't mean I'm in this strict diet, but I'm certainly eating much better.
3. I just about gave up soda and drink about 4x more water.
4. I was an alcoholic in denial. I would drink at least a 6 pack a night, or drink until I felt a "buzz". Now I can stop myself after the second beer or one glass of wine. In fact, most of the time I don't feel like drinking.
5. I feel much better overall, other than a constantly sore neck and sore joints.
I'd say that BJJ has changed my life very significantly in just 3 months. And now I look back and shake my head at why did I let myself go like that all these years.