Coke and milk can be drunk together, and no toxic reaction will occur when healthy people consume them, but it is not recommended to drink them together. Because cola is rich in carbonic acid, carbonate ions, and the calcium ions in milk will react to generate calcium carbonate, will form a white precipitate. This will make a lot of nutrients in milk not absorbed and utilized. Coke is a carbonated beverage, the main ingredients are carbonic acid, sugar, water, coloring, and milk is a high-calcium, high-protein food, containing protein, calcium, vitamins, fat, and other minerals, these two substances if the ingredients are mixed together will produce calcium carbonate precipitate, reducing the nutritional value and taste of each other. Mixing cola and milk affects the body’s ability to absorb the nutrients in the milk and reduces the nutritional value, so it is not recommended to drink them together.