This isn't meant to be goady.
I have issues with binge eating and often have days weeks where I eat far too much - snacks mainly. I eat several packets of crisps on the trot, several biscuits. This has gotten so much worse since WFH, I graze from lunchtime onwards. I can follow a full day of eating, snacking and dinner with toast late night.
I enjoy desperately need it for my mental health exercise, mainly running, so I think decades of this together with fairly healthy meals day-to-day, not much alcohol and being quite tall have kept me from being too overweight, although at 5"7 I'm borderline (BMI is almost 25).
I often wonder, genuinely, what it must be like to just eat whatever you want, whenever you want, 24/7, without care at all for weight gain. I hate feeling heavy, which I really do at the moment; I feel bloated constantly, uncomfortable in my stomach, hate seeing myself naked in the mirror and my running has definitely slowed because I'm carrying a few extra lbs. But it's not enough to stop me binge snacking so I can see how easy it is to gain the weight if you also don't exercise and are more genetically dispositioned to it.