Whey/weɪ/ Definition 1 of 2Pro Tip 1/3Culinary Byproduct Whey is often created during cheesemaking. It's not wasted but used in other food products. This yogurt includes whey from our cheese-making process. Pro Tip 2/3Nutrient-Rich Liquid Whey is a source of nutrients and can be used in baking or as animal feed. We add whey to our bread dough for extra nutrients. Pro Tip 3/3Not Always Discarded Though the definition says whey is often discarded, it's actually valued in many cultures. In some countries, whey is drunk as a refreshing beverage.