Whey protein helps maintain healthy body composition, fight off chronic diseases, and can help you improve your emotional health. Whey protein provides your body with essential amino acids. According to Dr. Gary Farr of Get Health Now, amino acids as a part of protein can be found in your muscles, ligaments, hair, nails, teeth, body fluids, organs and glands. Amino acids are used in these areas for growth and repair. Consuming whey protein as part of a nutritious diet can help aid in weight-loss efforts. According to the Whey Protein Institute, your body uses more energy to digest protein than other foods, which creates a thermic effect and enables you to burn a higher rate of calories after a protein meal. Whey protein is low in calories, fat and sugar, which helps to prevent weight gain while promoting a lean body composition. Whey protein helps to reduce glucose absorption time into the bloodstream to prevent hunger, according to the Whey Protein Institute. Slower glucose absorption can help fight the urge to snack between meals. Feeling stressed can often lead to feeling emotionally drained and overeating. Whey protein helps to reduce stress levels to combat this effect. According to Energy First, whey protein slows the production of cortisol, a stress hormone, to reduce stress and depression while helping to release the calming hormone serotonin. Whey protein is probably most commonly known for its use with weightlifting and muscle building. After a strength-training workout, your muscles begin to repair and need protein for this process. According to Energy First, whey protein builds more muscle by promoting protein synthesis. Whey protein can be used to improve your overall physical health while also preventing diseases and infection. According to the Whey Protein Institute, whey protein can help to slow cancer growth in the body, prevent type-2 diabetes by controlling blood glucose levels and promote new skin growth to speed up wound healing. Faster skin growth can be especially beneficial for large wounds and burn victims.