When we first got one of our dogs off the street, she was incredibly food motivated. She would hop the fence and roam and bring back cabbages, avocados, cauliflower, chips, and anything else she could find to snack on. Those are just examples we witnessed. But she always came back before we got home from work.
Now, 7 years later, she's picky. She'll spit out some food I give her if it isn't appealing enough. She can still obviously be motivated with food and treats, but it's far less unconditional.
Never underestimate the focus on food of a person or any animal who experiences(d) true hunger. I haven't come even close to it, yet the crave for any sort of energy when you are long over burning any sort of energy reserves was gradually overshadowing my mind.
In war times there are stories of people boiling and eating leather belts, boots and similar stuff. Imagine the drive to spend non-trivial amount of time and energy to eat that.
Now, 7 years later, she's picky. She'll spit out some food I give her if it isn't appealing enough. She can still obviously be motivated with food and treats, but it's far less unconditional.