Sweet Snack Enerzona 40-30-30. What are they? The SNACK 40-30-30 Enerzona bars are a tasty snack with the proper caloric balance, 40% Carbohydrates - 30% Proteins - 30% Fat. They are an easy and convenient way to make the snack a block away when we are holding constant the levels of glucose and insulin. Features: Magnesium (Mg) by 15% RDA (Recommended Daily Allowance). Magnesium is essential in the Zone Diet because it is the main mineral for carrying out the synthesis of eicosanoids. The best are made with soy protein. Not from genetically modified soybeans. Contains GLA (gamma linolenic acid) which is an essential fatty acid for eicosanoid synthesis. The flavors ORANGE, VANILLA YOGURT and do not contain gluten. Presentations: You can choose from several flavors: Chocolate, coconut, orange, and VANILLA YOGURT.