1, fruit juice, orange juice, sour plum soup and other acidic drinks. Some people give their children drinks such as orange juice soon after giving them milk, thinking that this can provide them with more comprehensive nutrition. In fact, this practice is wrong, because these acidic drinks will condense into larger and harder clots when combined with protein in milk in the stomach, so they should not be eaten together, and should be eaten after drinking milk for one hour. 2. chocolate. Milk is rich in protein and calcium, while chocolate is rich in heat and oxalic acid. If both are eaten at the same time, calcium in milk and oxalic acid in chocolate combine to form calcium oxalate. Calcium oxalate can't be digested and absorbed in human body, but it will cause children's slow growth, diarrhea and other adverse effects, and even make hair dry and dull, and there will be symptoms such as urinary calculi. 3, oranges, apricots, sour pomegranates and other fruits with more acid. These fruits are rich in fruit acid. After eating with milk, protein in milk will quickly combine with fruit acid to form a hard clot, which is difficult to digest and absorb. So you should eat it after drinking milk for an hour. 4. Malt extract. Because malt extract contains more fat and sugar, it will cause children's poor appetite and affect the digestion of milk. Adults had better drink milk without sugar. This is because sugar will decompose in the human body to form acid, which easily neutralizes calcium in milk and affects the absorption of calcium, so it is best not to add sugar. 6. Some people are used to cooking milk with eggs or soy milk. This method is not scientific. Because milk can't be boiled for a long time, whey protein will start to solidify when it is heated to 63 degrees Celsius. If heated to 80 degrees Celsius, the protein in milk will be completely solidified and the nutrients will be lost. If boiled in water, not only vitamin B 1, B2 and vitamin C will be destroyed, but also protein will be solidified and denatured, and calcium and phosphorus in minerals will be destroyed to some extent.