There’s a lot of resources to read or listen to to help dismantle the internal message that being or having fat is bad for you. Here are some places to start.
The Fat Nutritionist website
This was the first place I started to internalize the message that no matter what weight I was at, I deserved to eat when I am hungry.
The book “Shrill” by Lindy West
The book of essays: “Body Stories: in and out and with and through fat” Edited by Jill Andrew and May Friedman website