This is because once the proteins in milk and the fruit acids in the fruit meet, coagulation will occur, thus affecting the digestion and absorption of milk, so about 1 hour before and after drinking milk should not eat oranges, grapefruit or other acidic fruits.

80% of the protein in milk is casein, and when the pH of milk is below 4.6, a large number of casein aggregates will precipitate, making it difficult to be digested and absorbed, and in severe cases, it may also lead to indigestion or diarrhea.

Therefore, acidic fruits should not be mixed with milk, and milk should not be added to acidic beverages such as fruit juice. Grapefruit is rich in fruit acids, do not eat grapefruit after drinking milk, because the proteins in the milk will be with the fruit acids will form a harder clot, making it difficult for the gastrointestinal tract to digest and absorb.

Expanded

Milk drinking taboos:

1, milk should not be drunk raw, heated to see the boil, that is to take:

Milk in the Celsius 100 degrees lactose began to caramelize, decomposition of lactic acid and formic acid, reducing the nutritional value. Milk boiled for a long time color brown, lipid aroma reduced, protein denaturation precipitation, vitamin loss, milk contains anti-infant diarrhea rotavirus antibodies, but also destroyed.

2, milk boil a little cooler do not add sugar:

Milk lysine and fructose in the high temperature formation of fructose lysine, harmful to the human body. Sugar is acidic, calcium in milk is alkaline, the combination of the two make a lot of calcium loss. It is best not to add sugar.

3, should not drink milk on an empty stomach:

Fasting body is in a state of hunger, the demand for energy stage. Drinking milk at this time will be protein when carbohydrates into thermal energy and consumption. In the stomach to stay a short time, quickly excreted to the intestinal tract, is not conducive to digestion and absorption.

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