茶叶能放多久？是越存越香吗？茶叶过了保质期，还能不能喝？

茶叶能放多久？是越存越香吗？

茶叶的保质期与茶的品种有关，不同茶的加工工艺不同，存放时间和对其的影响也不同。

绿茶，工艺为不发酵，大多品类也讲求鲜嫩。常温下的保质期一般为一年左右，不适合久放。而且放得越久，鲜爽度会降低，滋味浓度也大不如前。

乌龙茶，属于半发酵茶，放冰箱冷藏保质期在18个月左右。而经过焙火的那些，如武夷岩茶放2年也还能喝，隔年陈茶反而香气馥郁、滋味醇厚；铁观音存储得当，也是越久越好。

红茶，为全发酵茶，一般三年内品饮口感最佳。

白茶与黑茶都很有存放价值，经过长时间的转化，滋味和品质都会有所提高，特别是白茶，我们一直有“一年茶，三年药，七年宝”的说法。不过这是在存放得当的前提下。

至于普洱茶比较特殊，分为生茶和熟茶——一般而言，生茶的保质期在5年左右，会越放越香；而熟茶保质期在15年以上，越放茶汤口感会更细滑。

但要注意，任何茶叶储存不当，都会影响口感，甚至出现变质的情况。

2

茶叶过了保质期，还能不能喝？

其实茶叶包装袋或者包装盒上的保质期，只是一个官方的参考数字，更准确的来说是“最佳饮用期”，也就是茶叶香气、口感和滋味最好的时候。

至于茶叶能不能喝，不能单单看保质期这个数字，更关键的是要去看茶叶有没有“变质”。

辨别茶叶是否变质的方法

闻：绿茶具有很强的吸附性和吸湿性，极容易吸收一些异味。若茶叶已经失去了原本的香气，有了陈味或者霉味，则最好还是不要喝了。

看：茶叶色泽暗黄，叶片不“脆”，多为变质。未变质的绿茶，正常情况颜色鲜亮，且含水量在7%，可搓捏成粉末。

泡：取一些茶叶拿来泡一会，看它的汤色是否纯正，茶汤的浓度有没有变化。茶汤变浑浊则不宜再喝。

影响茶叶品质的因素主要有温度、光线、湿度，降低或消除这些因素，茶叶可更好地保证质量。

2

茶叶虽好，但也不是“万能”的

茶中的营养成分多，因而网上关于它的功效流言也不少：

1

喝茶能抗癌？

这些年，关于喝茶抗癌的消息确实不少。

细胞和动物实验研究表明，尽管茶多酚对肺癌、结肠癌有一定预防和控制作用，但仍缺乏有说服力的人体直接证据。

另外，茶叶中的有效成分多，但含量有限，不是说光喝茶就能防癌了。

2

喝茶能解酒？

茶有提神醒脑的作用，因而不少人认为喝茶能醒酒，尤其是喝浓茶，效果更好。

其实不然，浓茶非但不解酒（解酒主要靠酶），还会伤肾。

浓茶中的茶碱能迅速地通过肾脏产生利尿作用，会促使尚未氧化的乙醛过早地进入肾脏。而乙醛对肾脏有较强毒性，可使肾小球和肾小管细胞受损，给肾功能带来危害。

3

茶叶能除甲醛？

茶叶有一定的吸附作用，因而不少人会把它用作冰箱除味剂，有些人还会在新房中放很多茶叶，用它除甲醛。

但其实，茶叶对甲醛的作用只是物理吸附，吸收作用是微乎其微的。茶叶只是掩盖住了甲醛味，并不代表真正净化了空气。

通风换气法是最直接最实惠的除甲醛方法，利用室内空气的流动，降低室内污染物的含量。

3

茶叶虽好，但要喝对才会受益

茶叶中的活性成分能够辅助降脂、调压、控糖，并降低心脑血管的发病率和死亡率，还能提高人体免疫力……不过，喝茶也有一些注意事项：

1

不同时间，喝不同的茶

早起喝绿茶，其能推动脏腑功能更快进入“工作”，有振奋阳气、提神醒脑、润化脾胃的功效。

中午喝乌龙，有消食作用。不过建议饭后1小时喝。

晚上喝熟普。它的茶多酚含量低，不容易影响睡眠，还能和胃、补肾、安神。

2

三类茶，不宜喝

头道茶，这其中会带有部分灰尘杂质，所以我们喝茶的时候一般会先洗茶，再饮用。

浓茶，即一次放的茶叶量过大，冲泡时间久了，味道又苦又涩。这样的茶容易使人过度兴奋，导致失眠，加大心脏、肾脏的负担，还会刺激胃粘膜，抑制机体对钙的吸收，增加疾病风险。

健康的成年人一日饮茶12克左右，每次3克，用150毫升水冲泡是适宜的。

久泡茶。时间越久，不仅茶味丧失，营养也流失了；而且放置过久，还可能受到周围环境的污染，难免会有微生物和细菌侵入，所以不建议喝。

3

茶叶的花样吃法

除了直接泡水，其实茶叶也有很多不同的吃法：

油茶，长寿秘宝

油茶是古来流传至今的长寿美食，甚至被乾隆赐名为“爽神汤”，有开胃消食、益气养血、祛寒除湿的效果。

做法：

锅中不放油，直接炒干绿茶茶叶，用木棍碾碎，根据锅的大小调整茶叶的量；

然后放入大块姜，也用棍子碾碎，绿茶与生姜比例是1:1；

接着放入一头大蒜凿开，把水气炒干；

炒干后加入少许油，油热后再加入不带叶子的葱头爆锅；

最后加开水，滤过后煮沸，一直保持沸腾的状态。

茶饭，助消化

早在我国唐代的医书《本草拾遗》中就对茶水煮饭有过这样的记载：久食令人瘦。

茶多酚能促进人体消化液的分泌，帮助消化；而且对于脂肪的分解也有好处。

很多专家很喜欢用茶煮粥：一把米，一小把茶叶（雀舌），一小把枸杞子来煮粥；嫌麻烦的，也可以直接把平时煮饭的水换成茶水。

How long can the tea last? Is it more fragrant?

The shelf life of tea is related to the variety of tea. The processing technology of different teas is different, and the storage time and its impact are also different.

Green tea, the process is not fermented, and most categories also emphasize freshness and tenderness. The shelf life at room temperature is generally about one year, which is not suitable for long-term storage. And the longer it is placed, the freshness will decrease, and the taste concentration will not be as good as before.

Oolong tea belongs to semi-fermented tea and has a shelf life of about 18 months in the refrigerator. And those that have been roasted, such as Wuyi rock tea, can still be drunk after 2 years, but the old tea in the next year has a rich aroma and a mellow taste; the longer the Tieguanyin is stored properly, the better.

Black tea, a fully fermented tea, generally tastes best within three years.

Both white tea and dark tea have storage value. After a long time of transformation, the taste and quality will be improved. Especially for white tea, we have always said that "one year tea, three years medicine, seven years treasure". But this is under the premise of proper storage.

As for Pu-erh tea, it is special, divided into raw tea and cooked tea. Generally speaking, the shelf life of raw tea is about 5 years, and the more fragrant it will be; while the shelf life of cooked tea is more than 15 years, the more the tea soup is placed, the more delicate the taste will be. slip.

However, it should be noted that any improper storage of tea leaves will affect the taste and even deteriorate.

2

Tea leaves have expired, can I still drink them?

In fact, the shelf life on the tea packaging bag or box is just an official reference number. More precisely, it is the "best drinking period", that is, the time when the aroma, taste and taste of tea are the best.

As for whether the tea can be drunk or not, it is not just the number of shelf life, but more importantly, whether the tea has "deteriorated".

How to tell if tea leaves are spoiled

Smell: Green tea has strong adsorption and hygroscopicity, and can easily absorb some odors. If the tea has lost its original aroma and has a stale or musty smell, it is best not to drink it.

Look: the color of the tea leaves is dark yellow, the leaves are not "brittle", and most of them are spoiled. Undeteriorated green tea, which is normally bright in color and has a water content of 7%, can be kneaded and kneaded into powder.

Soaking: Take some tea leaves and soak them for a while to see if the soup color is pure and whether the concentration of the tea soup has changed. If the tea soup becomes cloudy, it is not suitable to drink it.

The main factors that affect the quality of tea are temperature, light and humidity. By reducing or eliminating these factors, the quality of tea can be better guaranteed.

2

Tea is good, but it's not "all-purpose"

There are many nutrients in tea, so there are many rumors about its efficacy on the Internet:

1

Can drinking tea fight cancer?

In recent years, there has been a lot of news about drinking tea to fight cancer.

Cell and animal experimental studies have shown that although tea polyphenols have certain preventive and control effects on lung cancer and colon cancer, there is still a lack of convincing direct evidence in humans.

In addition, there are many active ingredients in tea, but the content is limited. It does not mean that drinking tea alone can prevent cancer.

2

Can drinking tea help you hangover?

Tea has a refreshing effect, so many people think that drinking tea can sober up, especially drinking strong tea, the effect is better.

In fact, it is not the case. Strong tea not only does not cure hangovers (the hangover mainly depends on enzymes), but also damages the kidneys.

Theophylline in strong tea can quickly produce a diuretic effect through the kidneys, which will promote the premature entry of unoxidized acetaldehyde into the kidneys. Acetaldehyde is highly toxic to the kidneys, which can damage glomerular and tubular cells and cause harm to renal function.

3

Can tea remove formaldehyde?

Tea has a certain adsorption effect, so many people will use it as a refrigerator deodorant, and some people will put a lot of tea in the new house and use it to remove formaldehyde.

But in fact, the effect of tea on formaldehyde is only physical adsorption, and the absorption effect is minimal. Tea leaves only cover up the smell of formaldehyde, but it does not mean that the air is truly purified.

Ventilation is the most direct and affordable method of removing formaldehyde, which uses the flow of indoor air to reduce the content of indoor pollutants.

3

Tea is good, but it will benefit if you drink it right

The active ingredients in tea can help lower lipids, regulate blood pressure, control sugar, reduce cardiovascular and cerebrovascular morbidity and mortality, and improve human immunity... However, there are some precautions when drinking tea:

1

Drink different teas at different times

Drinking green tea early in the morning can promote the functions of the viscera and enter the "work" faster, and has the effect of invigorating the yang qi, refreshing the brain, and moistening the spleen and stomach.

Drinking oolong at noon has the effect of digestion. However, it is recommended to drink it 1 hour after meals.

Drink cooked Pu at night. Its tea polyphenol content is low, it is not easy to affect sleep, and it can also harmonize the stomach, nourish the kidney, and soothe the nerves.

2

Three types of tea should not be drunk

The first tea contains some dust impurities, so when we drink tea, we usually wash the tea first, and then drink it.

Strong tea, that is, the amount of tea leaves put at one time is too large, the brewing time is long, and the taste is bitter and astringent. Such tea can easily make people overexcited, cause insomnia, increase the burden on the heart and kidneys, and stimulate the gastric mucosa, inhibit the body's absorption of calcium, and increase the risk of disease.

Healthy adults drink about 12 grams of tea a day, 3 grams each time, and it is appropriate to brew with 150 ml of water.

long tea. The longer the time is, not only the tea flavor will be lost, but the nutrients will also be lost; and if it is placed too long, it may be polluted by the surrounding environment, and microorganisms and bacteria will inevitably invade, so it is not recommended to drink.

3

How to eat tea

In addition to directly soaking in water, there are actually many different ways to eat tea:

Camellia, the secret of longevity

Camellia oleifera is a longevity food that has been handed down since ancient times. It was even named "Shuangshen Tang" by Qianlong.

practice:

Without putting oil in the pot, fry the green tea leaves directly, crush them with a wooden stick, and adjust the amount of tea leaves according to the size of the pot;

Then put in a large piece of ginger and crush it with a stick. The ratio of green tea to ginger is 1:1;

Then put in a head of garlic and chisel it, and fry the water to dry;

After frying, add a little oil, and when the oil is hot, add the shallots without leaves and fry them;

Finally add boiling water, strain it and bring it to a boil, keeping it boiling all the time.

Tea and rice to aid digestion

As early as in the medical book "Materia Medica Supplements" in the Tang Dynasty in my country, there was such a record about cooking rice with tea: eating for a long time makes people thin.

Tea polyphenols can promote the secretion of human digestive juice and help digestion; and it is also good for the decomposition of fat.

Many experts like to use tea to cook porridge: a handful of rice, a small handful of tea leaves (queer tongue), and a small handful of wolfberry to cook porridge; if it is troublesome, you can directly replace the water you usually cook with tea.