Global US Nut and Snack Bars Market by Product Type (Energy Bars, Protein Bars, Cereal Bars, Nut Bars), By Calorie Content (Regular, Low Calorie, Sugar Free), By Flavor (Regular, Flavor), By Nature (Organic, Conventional), By Size. (1.5-2, 5 oz, 2.6-3.5 oz, 3.6-5.5 oz, 5.5 oz and more), By distribution channel (supermarkets/hypermarkets, convenience stores, specialty stores, online stores, etc.)by