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有喝浓茶习惯的人不少,据专家对美国3170名50岁以上的老人进行饮茶习惯与骨折危险的分析表明,每天饮浓茶5杯的人,髋骨(骨盆外)骨折的危险较不饮浓茶者高70％。这是因为茶中的咖啡因可明显遏制钙在消化道中的吸收和增加尿中钙的排出,使体内缺钙而诱发骨中钙质流失,日久便出现骨质疏松症,导致容易骨折。 不久前,我国营养研究所、食品卫生研究所对国内20种茶叶的含氟量测定发现,每公斤茶叶中,氟化物含量平均为186.2毫克,高出其它食品数十至数百倍;其中广西、四川的砖茶每公斤中含氟量高达43毫克—52毫克,长期饮用,尤其是泡浓茶,可引起氟中毒。四川某地居民,就因长期饮用此类砖茶,氟骨症的检出率达97.1％,氟斑牙的检出率达72.6％。 此外,茶叶中的锡和黄酸也比较高,农药残留量超过国家允许标准的为数也不少,从饮食健康出发,每日饮茶量控制在5克—10克为宜。
There are a lot of people who drink tea habits, according to experts in the United States 3170 over the age of 50 drinking habits and fracture risk analysis showed that drinking 5 cups of tea a day, the risk of hip (pelvic) fracture risk 70% higher than those who do not drink tea. This is because caffeine in tea can significantly inhibit the absorption of calcium in the digestive tract and increase the excretion of calcium in the urine, causing calcium deficiency in the body and inducing the loss of calcium in the bone, leading to osteoporosis over time, resulting in easy fracture. Not long ago, China Institute of Nutrition, Institute of Food Hygiene on the determination of the fluorine content of 20 kinds of tea in the country found that fluoride content per kilogram of tea averaged 186.2 mg, higher than other foods tens to hundreds of times; of which Guangxi , Sichuan brick tea contains up to 43 mg-52 mg per kg of fluoride, long-term consumption, especially soaked tea, can cause fluorosis. Residents of a certain place in Sichuan Province, due to long-term consumption of such brick tea, the detection rate of skeletal fluorosis was 97.1% and the detection rate of dental fluorosis was 72.6%. In addition, the tin and yellow acid in tea is also relatively high, the number of pesticide residues exceeding the national standard is not less than a few, starting from the healthy diet, daily tea volume control in 5 grams -10 grams is appropriate.