Caffeine can stimulate the central nervous system and muscles, refresh the mind, enhance thinking ability and restore muscle fatigue. Acting on the cardiovascular system can improve heart function, relax blood vessels and promote blood circulation. For the gastrointestinal system, it can help digestion and help the decomposition of fat.

Black coffee contains a lot of caffeine. Caffeine can convert fat into fatty acids, which can be transported into human blood. If you exercise half an hour after drinking black coffee, it is very easy to convert the fat in the human body into heat energy and excrete it.

Precautions for drinking coffee:

Suffering from hypertension, coronary heart disease, arteriosclerosis and other diseases-drinking coffee for a long time or in large quantities can cause cardiovascular diseases.

Older women-coffee can reduce calcium and cause osteoporosis. After menopause, women need to supplement ten times as much calcium every day. Patients with stomach trouble-drinking too much coffee will make stomach trouble worse.

Pregnant women-drinking too much coffee can lead to fetal malformation or miscarriage.

Vitamin B 1 deficiency-vitamin B 1 can keep the balance and stability of the nervous system, and coffee can destroy it.

Cancer patients-drinking too much coffee is dangerous for normal people.

Honey tastes sweet and contains natural and healthy ingredients. You don't need sugar to get fat. Most of them contain monosaccharides and glucose, and can also moisten the intestines and relax the bowels. It is recommended to drink more honey.