Is caffeine harmful to people?

The benefits of caffeine to human body

1. Caffeine can stimulate the central nervous system and muscles, so it can boost the spirit, improve thinking and memory, and restore muscle fatigue.

two。 Action on the cardiovascular system can improve heart function, dilate blood vessels and promote blood circulation.

3. For the gastrointestinal system, it can help digestion and help decompose fat.

4. Recently, a new study in the United States shows that drinking coffee can increase libido, because coffee can improve blood circulation, speed up the heartbeat, and stimulate the activity of the nervous system, so regular coffee drinkers are more sexually active than non-regular drinkers. Not only that, but also reduce the risk of impotence.

The harmful effects of caffeine

1. Aggravate high blood pressure: caffeine is often combined with other simple painkillers because of its analgesic effect, but if you take it in large quantities 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, coupled with emotional stress, it can have a dangerous multiplication effect, so people at risk of high blood pressure should especially avoid drinking caffeinated drinks during stressful times at work. Some people who drink coffee all the year round think they are immune to the effects of caffeine, but this is not the case. One study shows that blood pressure can rise for up to 12 hours after drinking a cup of coffee.

two。 Induce osteoporosis: caffeine itself has a good diuretic effect. If you drink a lot of coffee for a long time, it is easy to cause bone loss and adversely affect the preservation of bone mass. For women, it may increase the threat of osteoporosis. But the premise is that people who don't get enough calcium in normal food, or people who don't move very often, plus women after menopause, calcium loss caused by lack of estrogen, 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 stop eating for fear of choking.

Coffee beans themselves contain vitamin B and nicotinic acid, and roasted beans contain more free fatty acids, caffeine and tannins than raw coffee beans, so coffee itself has calories, but not much. the main calories come from the cream and sugar you add to your coffee.

Although coffee is good for the body, it must also be moderate, with no more than 4 cups of about 800-1000cc a day. Drinking too much can be harmful for people who are prone to stress and anxiety-caffeine helps improve alertness, agility, memory and concentration. But drinking more coffee than you are used to will produce the same dose of stimulants that you are used to, which can cause nervousness. For people with anxiety disorders, caffeine can worsen symptoms such as sweaty palms, palpitations and tinnitus.

It takes time to drink coffee.

It is best to drink coffee after a meal, because it can promote gastrointestinal peristalsis, help digestion, decompose high-calorie, high-fat foods that have just been eaten, and are less likely to stimulate the intestines and stomach because of drinking coffee on an empty stomach. If you drink it every day, it has a good effect on the improvement of constipation.

It is best not to choose after dinner, for fear it will affect your sleep. If you want to drink coffee all night, you may unwittingly drink a lot, which is not good for your health.

These people are careful of drinking coffee.

1. Patients with liver disease: caffeine prolongs the time it takes to thank caffeine in the body. In general, the metabolism of caffeine in normal adults takes 2 hours, but in patients with liver disease or liver dysfunction, the metabolism of caffeine may take 4-5 hours, so patients with liver disease must be careful when drinking coffee, it is best not to drink it after dusk, so as not to affect sleep due to long metabolic time, and it is best not to exceed 1 cup a day.

two。 Patients with digestive diseases: I believe that people who often have stomachaches and stomach ailments have an experience that doctors will tell them not to eat irritating foods, including wine, chili peppers, coffee, tea and carbonated drinks.

Coffee is among them because the tannic acid stimulates gastric acid secretion, which must be avoided if it is in the acute stage of digestive disease. After returning to health, if you drink coffee occasionally, it is best to use it after meals to avoid drinking coffee on an empty stomach.

3. Pregnant women: many women pay special attention to all foods they eat since they are pregnant, and drinks containing caffeine are also taboo. This is mainly due to the slow metabolism of caffeine in pregnant women, the caffeine stays in the body for longer, and the fetus in the belly will not be able to remove caffeine from the blood through metabolism until eight or nine months.

4. Children: due to the incomplete development of children's liver and kidney and poor detoxification ability, the half-life of caffeine metabolism will be prolonged, so generally speaking, children under the age of 12 need to ban caffeine intake. Even people in Europe and the United States who drink coffee as boiled water all day have very strict restrictions on children's drinking coffee.