Tufts University Health & Nutrition Letter unjustly blames restaurant portion sizes for obesity. At least someone at Tufts has the sense to realize, ”It’s not the restaurant industry’s responsibility to keep Americans from overeating. Restaurant meals keep getting bigger, but no matter how big they get, it’s up to the diner to push the plate away, share a meal or ask for a hefty doggy bag,” says Larry Lindner, executive editor of the Tufts newsletter.