For students living on ramen noodles or people in low-wage, time-consuming jobs, folks who are down on their luck or living on fixed incomes, healthy eating may seem too expensive. Nutritionists say, however, that's a false perception. Healthy eating, in fact, is cheaper. The cost of expensive eating often isn't the food, it's the bells and whistles of trendy packaging. "You pay for convenience," says Amy Moore, a dietitian at St. Louis University. "What it takes is planning and sometimes a little investment." That means eating more fresh food from low-cost stores and farmers markets, watching store sales and using...