I seriously doubt that, Huan. Sure, there'd be gripes from the insurance corporations, dietary corporations, plastic surgeons, clothing corporations, special interests, and food corporations, but that would be very short lived. Already 'health food' costs much more than comporable 'junk food'. If you doubt that, just head to your local grocery store and check the prices on the Health Food aisles. Also, 'healthy living' doesn't mean totally abstaining from alcohols, fatty foods, and the like. What it means is moderation coupled with exercise.
In the moderate and long term, there would be economic booms, not recessions. With less paid for lifestyle medical deductables, downtime in hostpitals, healthier immune systems, less paid for cosmetic surgery (tucks, lifts, lipo), and better overall insurance rates, the average person would have more income to invest back into the economy, buying things they want, instead of paying for things they'd rather not be going through, like quadruple bypass surgery after a lifetime of poor intake choices.