Oddly enough, I managed to get all endings except for the first one! I tried to do what I thought would trigger it, but it was the hidden ending! Can we swap hints, maybe?
So for 4, you need to get to the warehouse while heavy enough to collapse the floor, or eat enough while inside to get that heavy. At the end of that, you'll get the last food item, with the hint for 5. For the hidden ending, get fat off of normal food (not animal feed).
