Reminds me of when I was on mess duty on Okinawa in 86. This Okinawan couple would come around a few times a week to take all of our food scraps from the mess hall. They ran a pig farm. In the states everything went into the trash.
I think the Japanese are very accustomed to using everything; here, people have gotten away from that. The *older folks* know what that it all about and cling to old habits; especially if they lived through the Depression.
When I had a wood range in my kitchen [it would warm us from Labor Day to Memorial Day]; I kept stock pots simmering 24/7, all winter; never wasted any scrap.
Now, I don’t have that facility.
Much scrap goes in the dog’s bowl.