Created for daily training and competition, GU Energy Chews pack energy-dense calories in a portable packet to help sustain energy demands of long duration activities. Energy Chews contain carbohydrates to keep you fueled while delaying bonking by sparing your glycogen stores. Sodium, the primary electrolyte lost in sweat, aids in hydration by maintaining water balance. The branched-chain amino acids (leucine, valine, isoleucine) may reduce mental fatigue and decrease muscle damage. Also known as GU Chomps. Double-Serve Energy Chews come in boxes of 18 packets (144 pieces). Each serving of four-pieces delivers 80 calories. GU Energy Chews pack energy-dense calories in a portable packet to help sustain energy demands of long duration activities. The 80-calorie serving (two servings per packet) contains carbohydrates to keep you fueled while delaying bonking by sparing your glycogen stores. Sodium, the primary electrolyte lost in sweat, aids in hydration by maintaining water balance.