Help to lose weight
I believe many people have heard that drinking black coffee can lose weight. In fact, this is only one of the factors. Caffeine can really accelerate the decomposition of fat, but at the same time, it needs to rely on muscle movement to convert excess fatty acids into heat energy for consumption. If there is no coordinated exercise, excess fatty acids will flow back along the blood stream and accumulate fat again. Therefore, after drinking coffee, you need to exercise actively at the same time in order to have a real weight loss effect! Coffee itself has calories, but not much. The main calories are the creamer and sugar you add when you drink coffee.
antioxidation
In recent years, all foods with antioxidant function are very popular in the market. Generally, vegetables and fruits are rich in vitamins A, C and B. Tea, which is quite popular in Japan, is regarded as healthy food because it is rich in antioxidants and can resist the harm of free radicals to human body. A few days ago, a research report pointed out that the content of antioxidants in coffee is four times that of tea, and it has stronger resistance to cardiovascular diseases. Moreover, coffee itself conforms to the principle of antioxidants, with darker color and bitter taste. Each coffee contains different antioxidants because of different brewing methods. For example, American coffee contains the least antioxidants, while espresso contains the most antioxidants. After adding creamer to coffee, its antioxidant effect will not be affected.
Improve dry eye
Foreign reports point out that people who drink coffee are much less likely to suffer from dry eye than those who don't drink coffee. This is mainly related to the purine component in coffee (eye drops containing purine can stimulate glands to secrete liquid, which has a certain protective effect on eyes). This is of course good news for computer people who love to drink coffee, but it should be noted that coffee itself has diuretic effect, even if some of its components have protective effect, people who have already suffered from dry eye and those who have taken any drugs containing diuretic components must be forbidden to take caffeinated drinks so as not to aggravate the loss of water in their bodies.
It can relieve pain.
Headache caused by a bad night's sleep or pain caused by vasoconstriction on one side of the temple can be relieved by coffee, but it must be drunk in the morning or at noon (note: it is forbidden from afternoon to night).
The amount of coffee
Coffee is good for people, but you should not drink too much. It is advisable to drink no more than 2 cups a day. For people who are easily nervous and anxious, drinking too much may be harmful.
coffee time
It is best to drink coffee after breakfast and lunch, because it can promote the peristalsis of the stomach, help digestion and break down the high-calorie and high-fat food you eat, and will not stimulate the stomach like drinking coffee on an empty stomach. It is best not to drink coffee after meals, for fear of affecting sleep.
If you want to stay up late by drinking coffee, you may unconsciously drink too much, which is not good for your health.
When you're nervous, it makes things worse.
Caffeine helps to improve alertness, sensitivity, memory and attention. But if you drink more coffee than you are used to, you will have the same dose of stimulants, which will cause tension. For people with anxiety tendency, caffeine can aggravate the symptoms of sweating, palpitation and tinnitus.
Aggravate hypertension
Caffeine is often combined with other simple painkillers because of its analgesic effect. However, if you take a lot of caffeine for a long time, if you already have high blood pressure, using a lot of caffeine will only make your situation worse. Because caffeine alone can raise blood pressure, if combined with emotional tension, it will have a dangerous multiplier effect. Therefore, people at risk of hypertension should especially avoid drinking caffeinated drinks when working pressure is high. Some people who drink coffee all the year round think they are immune to the effects of caffeine, but this is not the case. A study shows that after drinking a cup of coffee, the blood pressure can rise for as long as 12 hours.
Induced osteoporosis
Caffeine itself has a good diuretic effect. If you drink a lot of coffee for a long time, it will easily lead to bone loss, which will adversely affect the preservation of bone mass and may increase the threat of osteoporosis in women. However, the premise is that people who usually have insufficient calcium intake in food, or people who don't exercise often, and postmenopausal women, due to insufficient estrogen, calcium loss, coupled with a large amount of caffeine, may pose a threat to bones. If you can enjoy it in a reasonable amount, you can still do it without choking.
These people drink coffee carefully.
hepatopath
Caffeine can prolong the death time of caffeine in the body. It takes 2 hours for normal adults to metabolize caffeine, but it may take 4-5 hours for patients with liver disease or liver insufficiency. Therefore, patients with liver disease must be careful when drinking coffee, and it is best not to drink it after the evening, so as to avoid the long metabolism time affecting sleep, and it is best not to exceed 1 cup a day.
Patients with digestive system diseases
I believe that people who often have stomachaches and stomach problems have an experience. Doctors will definitely tell them not to eat irritating foods, including wine, peppers, coffee, tea and carbonated drinks.
Coffee is one of them, because its tannic acid can stimulate gastric acid secretion. If you are a patient with acute digestive system diseases, you must avoid drinking it. After recovery, if you drink coffee occasionally, it is best to use it after meals to avoid drinking coffee on an empty stomach.
pregnant woman
Many women will pay special attention to all the food they eat after pregnancy, and caffeinated drinks are of course listed as one of the taboos. This is mainly due to the slow metabolism of caffeine in pregnant women, which will prolong the time of caffeine staying in the body, while it takes eight or nine months for the fetus in the abdomen to remove caffeine from the blood through metabolism.
children
Because children's liver and kidney are not fully developed and their detoxification ability is poor, the half-life of caffeine metabolism will be prolonged, so generally speaking, children under 12 need to ban caffeine intake. Even Europeans and Americans who drink coffee as boiling water all day have strict restrictions on children's drinking coffee.