Four truths about coffee: the last accident

Rumor 4: drinking coffee will make big yellow teeth?

Hey, this is really possible.

Coffee, tea, red wine and other famous colored drinks all contain a substance called tannic acid, which is dark brown. If it acts on the teeth for a long time, it will infiltrate into the inside of the teeth, causing the teeth to turn yellow.

Moreover, ordinary brushing and gargling is useless for this type of "rhubarb teeth".

Don't be sad, there are several ways to teach you:

Drink with a straw to reduce contact between teeth and coffee, suitable for iced coffee

Add milk, which contains casein, which can be combined with tannic acid, weakening the penetration of tannic acid into the teeth and reducing tooth staining.

Doctor of cloves, foreigners drink more coffee than we do. How come their teeth are so white?

The market for tooth whitening in the United States is worth $11 billion a year. You see, rumor 3: drinking coffee leads to calcium loss?

In theory, coffee increases calcium loss, but in practice:

Caffeine has only a short-term diuretic effect, and the caffeine in each cup of coffee will only increase the calcium loss of 2~3mg. If you drink coffee every day, you don't have to worry too much about calcium loss.

And, if you drink milk coffee, don't worry. Calcium from milk is more than enough to make up for milk loss caused by caffeine and oxalic acid. Rumor 2: drinking coffee on an empty stomach hurts your stomach?

First of all, you can rest assured that many studies have confirmed that coffee does not cause stomach ulcers and gastroesophageal reflux.

However, coffee does have some effects on the gastrointestinal tract, such as increasing the secretion of gastric acid, relaxing the esophageal sphincter, and promoting peristalsis of the small intestine.

My advice on the attitude towards coffee is:

If you want to drink coffee on an empty stomach, it is not recommended to choose black coffee. Try a latte with milk.

If you have gastrointestinal disease, don't die, eat something and drink coffee obediently. Rumor one: coffee is bad for the heart?

Some people have heart palpitations and headaches after drinking coffee. It has been said for a long time that coffee is bad for the heart.

But I want to tell those people who "don't drink coffee will die star" a big piece of good news:

After hundreds of years of debate, scholars have confirmed that drinking a moderate amount of coffee is actually good for cardiovascular health.

A 2014 study of 36 studies involving 1.28 million people revealed the following relationship between coffee intake and the risk of cardiovascular disease:

1.5 cups of coffee a day reduced the incidence of cardiovascular disease by 11%.

3.5 cups a day, a reduction of 15%, with the greatest benefit.

When 5 cups or more, there is no effect.

Every cup here is 150mL.

Coffee is not a magic medicine, but drinking coffee may really be a healthy lifestyle.