And there's research which does demonstrate that some people can graze and maintain their weight. Until you brush, of course. If you graze all day, that wear-down is pretty much continuous. Sticky platelets can lead to clotting and heart attacks. So you need more insulin.
Heart attacks lurk around that corner too.
It's a small thing, but every bit helps. Food can become a conflict-resolution tool. People use snacks to get through emotional trauma, then suffer with guilt afterward. It becomes a roller coaster. Finally, number six - depletion of your stomach's hydrochloric acid.