Some of us have depression because of heredity. I don't do diet anything period. If I'm going to have a soda, I have full lead! I try to cut back on the size of the soda. Mostly I drink water-lots of it. I do believe that diet stuff can cause depression - especially if it's overeaten or over-drank. I also know that it causes headaches-first hand. That was in the old days when I used to drink the occasional diet soda. I've never really been a fan of any diet drink. They all taste funny and
leave a bad taste in my mouth.