When I was a child, I used to have a can of Coca-Cola in my school lunch every day, and usually had one after school when I got home. I would also have at least one can each day on the weekend. I was so active back then that I never really worried about it, however, in my early 20's when I started slowing down due to university and work, I noticed the weight starting to pack on, so I tried to stop drinking Coke. Well, the withdrawals were not fun as I had severe headaches, lack of concentration, and a bit of the shakes. I was at the point where if I didn't have a can of Coke a day, they would start. I ended up getting off the soda & caffeine, and now I do drink coffee. Some days I'll have 2-4 cups, other days I'll have nothing, but I don't have any withdrawal symptoms when I don't have any. I've gone for a week or more with no caffeinated drinks and no problem.

The only thing that bothers me now is if I have too much caffeine. Maybe I'm just getting older.