(Concern) Chest fat grafting side effects

I have never thought about breast surgery.

Breast fat grafting is for adding volume, right?

Since I plan to use my own fat, the risk of side effects is likely low.

And how advanced has our country's plastic surgery technology become?

But if I had to find one, what would the side effects be?

On the other hand, if I only focus on filling the fat, I think I might lose everything later because I won't be able to diet properly.

I'm curious about how the procedure should be done to be considered very successful.