Realize that the problem is not from 1 candy, but from 1 kilogram, eaten regularly for a long amount of time. I am exaggerating, of course, but I think the meaning is clear.
The problem of weight gain usually lies in overeating, I liked the example that Dr. Kovalkov gave in his book. He asked readers to imagine that the kitchen has a faucet with water, and the floor is constantly wet, no matter how much a person wipes the floor, it will never get dry, because the problem is in the faucet.
It is worth exercising moderation when eating , and then life will be a joy, and the sides will not get fat.
Imagine the worst option, accept it, and then think about what you can do to avoid it. Sometimes this system works. When you manage to drive your brain into a state of "give a fuck" about a problem, then it is much clearer to see what you can do to avoid this problem or solve it.
Knowing where my sores with eating behavior began, I can advise you to see a doctor. if you run it, nothing good will come of it - that's for sure.