One of the best-tasting, low carb PROTEIN BARS on the market, Quest PROTEIN Bars are only 160 calories and provide 20g of protein with only 3g of active carbs (derived from nuts, not sugar). Sweetened with stevia and erythritol (sugar alcohol sweetener with fewer calories than sugar), Quest Nutrition Protein Bars are a great low carb meal replacement that is just as nutritious. Quest Double Chocolate Chunk Protein Bars are a delicious and great way to lose weight, or gain muscle; without the added calories, carbs, or sugar.