if it refers to the sterilized finished products sold in the market, it is no problem to drink them cold, but if you consider the stomach, it is better to drink them warm. Drinking cold is easy to hurt the stomach. If you mean fresh milk, you must pay attention to heating it to kill some bacteria.

It is not advisable to cook milk at high temperature for a long time, because the protein in milk will change from sol state to gel state under the action of high temperature, which will lead to the appearance of sediment and decrease its nutritional value. It is unnecessary to boil milk if disinfection is considered, because fresh milk produced by regular manufacturers is disinfected by pasteurization.

In fact, milk is not suitable for frozen storage, because freezing will denature protein in milk, and the fat will be layered. After thawing, protein and fat will precipitate and solidify, which is not conducive to human absorption, but also will greatly reduce the nutritional value of milk.

Therefore, fresh milk should be stored at room temperature in the dark.