I have this pet theory as well, at least for myself. After being quite sick for 3-4 weeks at 28yo and losing 12-15 lbs, I noticed that since then, my energy lev

I have this pet theory as well, at least for myself. After being quite sick for 3-4 weeks at 28yo and losing 12-15 lbs, I noticed that since then, my energy levels never returned and my ability to lose weight changed from pretty easy to needing to exercise and diet quite a bit.