Drinking milk on an empty stomach doesn't usually cause diarrhea, but diarrhea is because you may have symptoms of "lactose intolerance".

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Lactose intolerance is a non-infectious diarrhea caused by a low secretion of the enzyme lactase, which is unable to completely digest and break down the lactose in breast milk or cow's milk, also known as lactase deficiency. Lactase deficiency is now a widespread worldwide problem, and there is no better treatment for the time being but to replace it with other foods.

Foods that can be replaced:

1. Lactose-free formula or fresh milk, lactose-free formula that replaces lactose with maltose or dextran in the composition of some milks, in which proteins, fats, and other components are still retained in the formula. Lactose-free fresh milk is added lactase enzyme in fresh milk before drinking to digest and break down the lactose in fresh milk, solving the problem of lactose intolerant patients.

2. Soymilk, soybean-based specially manufactured formula milk called soybean formula milk, soymilk does not contain lactose, protein to soy protein-based, plus methionine and taurine. This kind of formula is different from the unspecialized soy milk and soybean powder, but it is not suitable for long-term consumption.

3. Yogurt, made by fermenting fresh milk with lactic acid bacteria, most of the lactose is broken down into lactic acid, making it a less lactose product. Yogurt should be stored in 0 ~ 10 ℃ environment, and should not exceed 14 days, drink without heating, not accustomed to cold drinks can be warmed. Undeteriorated yogurt should not have air bubbles and yeast flavor, the surface should not appear mold or mildew. Another lactobacillus milk powder, add water into milk, placed in 40 ° warm water 4-8 hours can be.

Reference:Lactose intolerance_Baidu encyclopedia