American, mocha, iced latte, drinking a cup every morning, has become the living standard of many young people. Coffee has won the hearts of young people with its unique flavor, refreshing effect and petty bourgeoisie. Especially at present, the pace of life is fast and the pressure of work and life is increasing. For many office workers, they will feel tired and weak after working for a period of time. They want to refresh themselves by drinking a cup of coffee and improve the efficiency of work and study in the afternoon. So, what happens when you drink black coffee for a long time?

Black coffee contains caffeine. Drinking a proper amount of black coffee every day can refresh your mind and control your weight, which usually does not have adverse effects on your body. If you drink too much black coffee for a long time, it may lead to aggravation of hypertension, gastrointestinal diseases, excessive excitement of the central nervous system, arteriosclerosis, endocrine disorders, osteoporosis and so on.

1, hypertension aggravates. Black coffee contains caffeine, which can greatly accelerate blood circulation, thus leading to the increase of blood pressure in patients with hypertension;

2, gastrointestinal diseases The alkaline substances in black coffee will lead to excessive gastric acid secretion, stimulate the gastrointestinal tract, and easily lead to gastrointestinal diseases, such as gastritis and gastric ulcer;

3, the central nervous system is too excited. Some people are very sensitive to caffeine. Excessive drinking of black coffee can lead to central nervous system excitement, palpitation and tachycardia. In severe cases, there will be sleep disorders, neurasthenia, forgetfulness and inattention;

4, vascular sclerosis: excessive caffeine accumulation in the body will reduce vascular elasticity and increase the risk of vascular sclerosis. Therefore, patients with coronary heart disease, hypertension and atherosclerosis are not suitable for drinking black coffee;

5, endocrine disorders: drinking black coffee affects sleep, endocrine disorders and abnormal hormone levels may occur when sleep is insufficient, which may lead to hyperlipidemia in severe cases;

6, osteoporosis: black coffee can diuretic, excessive drinking of black coffee may lead to calcium loss, which is not conducive to the preservation of bone mass, leading to osteoporosis.

Suggestion: Who is not suitable for drinking coffee?

(1) Renal failure and diseases of kidney calculi's patients: For patients with renal failure and kidney calculi, it is not recommended to drink too much coffee, because coffee contains potassium and oxalic acid, and excessive intake will increase the burden on the kidneys, which is not conducive to the recovery of kidney diseases.

(2) Allergic people: There are also many people who are physically sensitive and may be allergic to certain substances in coffee, so such people cannot drink coffee.

(3) The elderly: For middle-aged and elderly people, the quality of sleep declines and the sleep time is relatively short after getting old. It is also not recommended to drink coffee, so as not to get nervous after drinking coffee and aggravate insomnia.

(4) Patients with heart disease: For patients with heart disease, drinking coffee is not recommended, and everything that may irritate the heart should be avoided. Some substances contained in coffee will stimulate the heart and cause heart rate fluctuations, so it is not recommended for such people to drink coffee.