How to choose a cup for healthy drinking?

In summer and autumn, the human body needs a lot of water, so we usually drink water to supplement the loss of water in the body. Working people often drink water from plastic cups. Experts suggest that in health care, except porcelain cups, other cups are not very healthy. Metal cups, such as stainless steel, are more expensive than ceramic cups. Metal elements contained in enamel cups are usually stable, but they may be dissolved in acidic environment, so it is not safe to drink acidic drinks such as coffee and orange juice. Disposable paper cups just look hygienic and convenient, but in fact, the product qualification rate can't be judged, and whether it is clean or not can't be recognized by the naked eye. From the perspective of environmental protection, disposable paper cups should be used as little as possible. Some paper cup manufacturers add a lot of fluorescent brighteners to make the cups look whiter. It is this fluorescent substance that can mutate cells, and once it enters the human body, it will become a potential carcinogen. Secondly, those unqualified paper cups are generally soft and easy to deform when poured into water. Some paper cups are poorly sealed, and the bottom of the cup is easy to seep, which makes it easy for hot water to burn your hands. What's more, if you gently touch the inside of the paper cup with your hand, you can feel fine powder on it, and it will turn white when you touch it with your fingers. This is a typical inferior paper cup. Plastic cups should also be a kind of unpopular. Because plasticizers are often added to plastics, plastics contain some toxic chemicals. When hot water or boiled water is filled in plastic cups, the toxic chemicals are easily diluted into water. There are many pores in the internal microstructure of plastics, which hide dirt. If it is not cleaned, bacteria can easily breed. Therefore, when purchasing plastic cups, you must choose food-grade plastic cups that meet the national standards. Colorful cups are very attractive, but you'd better not use them. Because those bright pigments have great hidden dangers, especially when the inner wall is glazed, when the cup is filled with boiled water or drinks with high acidity and alkalinity, toxic heavy metal elements such as lead in these pigments are easily dissolved in the liquid, and people will do harm to the human body if they drink the liquid containing chemicals. Among all the cups made of materials, the glass is the healthiest. This kind of glass contains no organic chemicals in the firing process. When people drink water or other drinks from glasses, they don't have to worry about chemicals being drunk into their stomachs. Moreover, the glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the glass wall. Therefore, it is the healthiest and safest for people to drink the water in the glass. However, although glass contains no chemicals and is easy to clean, users can easily burn themselves because of the strong thermal conductivity of glass materials. If the water temperature is too high, the glass may burst, so try to avoid holding hot water. The first choice for drinking water is a ceramic cup coated with colorless glaze, especially the inner wall should be colorless. This material is not only safe and resistant to high temperature, but also has a good thermal insulation effect. Drinking hot water or tea is a good choice.