I was affected by a similar philosophy for a long time. For me, it’s an aversion to wastefulness for the theoretical sake of ecology and economics. The logical flaw I’m seeing now is that overeating to the point of obesity or indigestion is more of a waste and throwing the food away, and what I need to do is purchase less or give it to someone else.

Even worse, I have celiac and an esophagus condition that is much worse with overeating, and habitually at restaurants I’d clean my plate because I thought getting a takeout box was a waste, but I did not want to see the food be thrown out. I also see a similar pattern with containers of packaged food. I’m much more likely to finish that last one or two cookies or handfuls of chip crumbs and leave them for later.

I’m not sure that this study contains any new useful advice, but it is a real phenomenon.