It seems possible. Many a dietician already sees it that way. Millions of Americans make themselves sick by routinely stuffing themselves with fatty, salt-heavy, food-like substances.
They eat meals that are too big and sip over-sugared drinks. But the core of the issue is snacking. Americans have come to believe that any activity, especially watching television, needs to be accompanied by high-calorie munching. (Canadians, as usual, closely follow them; other nations fall into line behind us.)
Mass obesity, on a level never before approached in the world, is the result. A historian of the future, looking back, may well decide that obesity produced society-crippling levels of heart disease, diabetes, etc., which collapsed the health system, which in turn destroyed the economy.