There are a lot of myths thrown around about willpower. Namely, that one has or doesn’t have it…
That’s a pretty fixed mindset!
The truth (that is, science) of it, though, is that willpower and “discipline” are like muscles – they are strengthened and fatigued depending on work load.
Some of the integral components of these are that we listen to and trust our body's message to tell us what, when, and how much to eat. These capacities develop over time, just like any skill.