When people go out to eat, they often underestimate the calories they are taking in by about 94 percent, says David Zinczenko, co-author of the Eat This, Not That! series of books. David, who is also the editor-in-chief of Men's Health magazine, investigates the nutritional data of restaurant and grocery store foods and finds healthy alternatives to your calorie-laden favorites. He shares some tips you should keep in mind that will help you make smarter food choices and trim inches from your waistline.