Shopping: When shopping for apples, you should choose apples with large, moderate size, thin skin, bright luster, crisp flesh and sweet juice. No bug eyes or trauma.
Cleaning: After the apple is soaked in water, put a little salt on the skin, and then rub it back and forth gently with both hands, so that the dirty things on the surface can be cleaned quickly, and then rinsed with clear water, and you can eat it safely.
Preservation: Apples should be kept in a low temperature and humid environment. Family members can wrap them in plastic bags and keep them in the refrigerator. After the apple is cut, it will turn brown when it comes into contact with air, and it can be soaked in salt water for about 15 minutes. Or drop lemon juice on apple slices to prevent apples from oxidation and discoloration.
Tip: It's best not to peel apples.
Most pectin in apples is concentrated in the epidermis and its vicinity. Pectin can not only increase the amount of stool, but also absorb water during diarrhea, so that the stool can maintain a certain hardness. So don't peel apples when you are constipated, and it is more effective to eat peeled apples when you have diarrhea.