I love how you took a personal experience in one part of your life and used it to find understanding/empathy for others--that's awesome!
And yes, I think it's pretty similar. I have my own significant weight issues, and am firmly convinced that it's not that thinner people have far more will power than I do, it's that they don't have the same urges and food calling their name all day every day. I actually have a ton of willpower--can say no to myself thousands of times a day--but by the 3567th time, the willpower runs out. Which is why it's important, just as with spending, to put structure in place to reduce the number of related decisions one has to make every day.
People who are "naturally" anything often don't understand what it's like not to be naturally that way, so I really commend you for trying to relate.