I experienced this happening when I stopped being as careful about my diet. The literal second I relaxed and started eating the odd bit of UPF here, a few sweets there for a pick me up. A Starbucks latte and a croissant instead of a black Americano and a protein bar on a work trip because I'm stressed out and why not. A can of Coke Zero in the afternoon because I'm tired. Not making healthy choices while eating out for work. A drink on a Thursday instead of waiting til Friday evening. Skipping exercise because of Christmas nights out and family obligations.
I was telling myself each time it was just a one off, but the food noise and ravenous hunger returned quite quickly and bang, back to prediabetes and 3kg rapidly regained because all of a sudden I'm ravenous all the time again. I am having to accept that if I want to stay off MJ and stave off diabetes without medication, I can't eat UPF, I can't base my meals on carbs and not protein and veg, I can't drink sweetened drinks and sodas, whether artificial or sugar sweetened. I've returned to the fairly strict diet I was keeping before I hit a period of stress and overwhelm and I feel like I've learned a valuable lesson that there just is no complacency and I can't get away with a few weeks of being lax with my diet and habits if I want my weight kept down, food noise not to rule my life, and not to end up like my dad with uncontrolled Type 2. WLI may be a tool I need in short ish term bursts to ensure I can get back on track if things do fall off and poor blood sugar control starts driving my appetite and metabolism again.
It doesn't feel fair in a way that my biology is this way, others can eat these things blithely with seemingly no consequences, if I have a poor diet and don't exercise as regularly for a few weeks, my body goes bang, makes me overeat, stack on weight and feel awful due to the blood sugar rollercoaster. But I can either give in to that or not. I choose not.