If you've ever tried to lose weight though, you know how it can become a struggle--you're doing fine for a few days or weeks, then suddenly it's like an invisible switch flips and you might spend a day having an intense battle of willpower. Then the next day you might be fine again. It's reasonable to want to know the root cause(s) of those seemingly random struggles, imo.
Edit: this comment isn't as relevant after the original was edited, alas
Edit: this comment isn't as relevant after the original was edited, alas