[refutes the rumor] # Coffee when drinking water in advance of osteoporosis # does drinking coffee really lead to osteoporosis?

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"after a severe cough, a 30-year-old white-collar woman suddenly felt chest pain and was found to have coughed three ribs in the hospital. it turned out that she drank coffee as water all day, and her bones were as old as a 60-year-old man."

Recently, a news article about "female white-collar workers coughing up three ribs and drinking coffee as water led to osteoporosis". Even Sina and NetEase pushed the news. Many coffee lovers said they were bombarded by "warm tips" from friends around them, and came to ask the editor whether drinking too much coffee would really lead to osteoporosis.

China's coffee market is becoming more and more prosperous, and it is common for many people to have one or two cups of coffee every day, but many people still have a lot of health concerns about coffee. Today, the editor will crack it. Misunderstanding that drinking coffee can lead to osteoporosis!

According to the news article # Coffee when drinking Water and Osteoporosis #, doctors associate the habit of female white-collar workers who "love coffee and basically drink coffee as water for more than 7 years" to their "early osteoporosis". Although the principle has not been analyzed, it is inferred from the principle that "oxalic acid and caffeine in coffee inhibit calcium absorption". So, does coffee really inhibit calcium absorption?

Does the oxalic acid in coffee inhibit calcium absorption? Yes! But very few.

The most common reason that coffee inhibits calcium absorption is that coffee contains oxalic acid, which combines with calcium and reduces calcium absorption. Some people even suggest that coffee should be taken separately from high-calcium foods such as milk, such as latte, to avoid reducing the absorption rate of calcium after being bonded.

Oxalic acid (oxalic acid), also known as oxalic acid, is structurally linked to two carboxyl groups, so oxalic acid has two negative charges and happens to combine with two positively charged calcium ions (Ca2+) to further reduce calcium absorption.

In previous studies, scholars used isotopes to calibrate calcium, allowing experimental animals to ingest calcium oxalate or spinach with high oxalic acid (containing high oxalate and calcium). Compared with the control group of calcium chloride (CaCl2), the calcium absorption rate was significantly reduced by 90%, proving that oxalic acid can inhibit calcium absorption!

But is coffee high in oxalic acid?

Oxalic acid and calcium are both bivalent ions, which theoretically combine at 1:1, so if you want to greatly inhibit calcium absorption, you must contain a lot of oxalic acid. Coffee beans are high in oxalic acid, with 200 milligrams of oxalic acid per 100 grams of raw coffee beans (dry weight).

But also consider roasting, brewing, usage and other factors that will affect the content of oxalic acid in coffee liquid. In fact, coffee "liquid" itself is not a food rich in oxalic acid. The content of oxalic acid per 100 grams of coffee liquid is only 0.9 mg (link). If you convert a large cup of coffee to only 2 mg, how can you combine a large amount of calcium in milk?

Does caffeine in coffee affect calcium absorption? Yes! But it's not about the coffee.

In addition to oxalic acid, caffeine may also affect calcium absorption? But caffeine does not carry any charge, so how does it affect calcium absorption? Caffeine is a weak diuretic that increases the excretion of sodium and water in the kidneys, so it has a slight diuretic effect. A 1982 study showed that caffeine increases the excretion of calcium in the urine and promotes the secretion of calcium in the small intestine, and its effect is proportional to caffeine intake. It can be learned from this study that the more coffee you drink, the more calcium you lose, and the more likely you are to get osteoporosis. But is it true?

Caffeine can excite the central nervous system, so it is often used as a pick-me-up. After a long period of coffee addiction, you will feel less refreshing, and you need more coffee to achieve the previous effect, and this is because people experience the central nervous system effects of adapting to caffeine. However, the aforementioned caffeine will increase the excretion of calcium in the urine and promote the secretion of calcium in the small intestine, and the effect will not be reduced by long-term drinking coffee. In other words, from a physiological point of view, no matter how much you drink, calcium will be lost.

Although caffeine does increase calcium loss physiologically, epidemiological studies have shown that caffeine intake is not associated with bone loss and fractures in women between the ages of 20 and 50. In other words, whether young women drink caffeinated foods such as coffee or tea does not affect bone mineral density or the incidence of fractures.

Coffee can lead to bone calcium loss, focusing on whether you are getting enough calcium.

Even if caffeine increases calcium loss, it has been mentioned in many studies that eating enough calcium or dairy products can offset the bone risk caused by coffee! In the above-mentioned 2006 study, scholars further analyzed the subjects' calcium intake and found that for people with sufficient calcium intake, coffee intake did not increase bone risk, and as early as 1994 in the Journal of the American Medical Association, it is mentioned that drinking enough milk can get enough calcium to offset the bone problems caused by coffee.

So the point is whether you are getting enough calcium or dairy products, not the coffee itself! And as mentioned earlier, the oxalic acid and caffeine in coffee will not affect calcium absorption, so if you are worried about drinking coffee and osteoporosis, drinking latte coffee will be a good choice. Besides the flavor and nutrition of coffee, you can also supplement calcium to avoid the risk of osteoporosis.

So, what about the "early osteoporosis" of this "30-year-old white-collar woman"?

Sina Weibo big V@ clove doctor came out to refute the rumor: if you drink coffee every day, you don't have to worry about calcium loss.

According to the popular science of another bobcat in white, it is obviously wrong that female white-collar workers drink coffee and lead to severe osteoporosis. The osteoporosis of the young white-collar woman is not caused by drinking too much coffee and the cause needs to be further traced.

Osteoporosis in young people is mostly secondary osteoporosis, mostly secondary to diseases, and it is necessary to look for primary diseases. The common pathological causes of severe osteoporosis are:

1. Hyperparathyroidism.

2. Inflammatory intestinal diseases.

3. Congenital absence of ovary.

4. Long-term use of corticosteroids and other factors may lead to secondary osteoporosis.

5. Hyperthyroidism.

To improve this type of osteoporosis, it is mainly necessary to treat the focus of the disease or adjust drugs to prevent massive bone loss. People with this type of osteoporosis should go to other hospitals to find out the cause of osteoporosis, instead of simply attributing the cause of osteoporosis to drinking more coffee so as not to delay the disease.

Finally, the editor sent the latest ranking of per capita coffee consumption around the world to all coffee lovers:

Finns are rated as the world's top coffee consumers by the International Coffee Organization. They drink as much as 12 kilograms of coffee a year, which is about 10 cups of coffee a day! It is 8.65 kg in Denmark and 9.69 kg in Norway. This is the real "drink coffee as water"!

Unit: measured in kilograms of raw coffee (data source: ICO)

According to the inference that "early osteoporosis has a lot to do with coffee drinking", are all these foreigners who really drink coffee as water osteoporosis?

Photo Source: Internet