I talked myself into a nasty one. I was sharing a large house with 6 other people who were mostly into health food. A couple of them were a bit extreme about it. Sugar was one thing they didn't like.
I was told 'A chocolate bar picks you up and gives you more energy at first, but then it lets you back down and you have to pay for it after.' I had an occasional chocolate bar in those days, and neither of those things had ever happened to me, so that didn't seem to make a lot of sense.
Besides that, even the protein from a steak has to become glucose before the body can use it as fuel. I decided there was nothing wrong with sugar.
When the net came along, I read that exercise is the main thing. If you are getting enough of that, your body will tear the nutrients out of almost anything. That sounded good to me. Now it seems obvious that it isn't true.
A years later my supermarket had regular clearance sales on chocolate. I liked chocolate and after holidays like valentines day, the prices would be about 10 cents on the dollar. I started stocking up.
It took a couple of years of damage before I realized that too much sugar does do nasty things. Now I don't even go near it.