Tea unfit for consumption:
1, deteriorated tea
If tea is not properly stored, it is easy to absorb moisture and become moldy, and some people are reluctant to discard moldy tea out of love for tea and economy. Deteriorated tea contains a lot of substances and germs harmful to human body, which is absolutely inedible. If high-quality tea is left for too long after soaking, the tea soup will also deteriorate due to oxidation and microbial reproduction, and such tea can no longer be drunk.
2, the first tea
Modern tea will inevitably be polluted by pesticides, fertilizers and dust in the process of planting, processing and packaging. The first course of tea is actually the water for washing tea, which should be poured out as soon as possible. Pesticide residues in tea may not only cause chronic toxicity, but also cause acute poisoning, especially for children.
Extended data
Beneficial ingredients:
1, tea polyphenols
Tea polyphenols is the most soluble component in tea, and it is also the most important substance for tea to play its health care role. The most typical one is catechin (phenol), which has many functions, such as antioxidation (eliminating oxygen free radicals), anti-inflammation, reducing the incidence of cardiovascular disease, preventing cancer, reducing blood lipid, reducing body fat formation, antibacterial, changing the ecology of intestinal flora and so on.
2, tea pigment
Mainly including chlorophyll, β-carotene, etc., it has the functions of anti-swelling, anti-aging and beauty.
3, theanine
Can improve brain function, enhance memory and learning ability. It can be used for preventing Alzheimer's disease, Parkinson's disease and autonomic nervous dysfunction.
Baidu encyclopedia-tea
People's Network-10 Don't drink this kind of tea!