1. Cold aggravation: black buckwheat tea is cold tea, long-term drinking will induce the body to aggravate the cold, resulting in cold hands and feet and other symptoms.

2. Increase acid reflux: drinking black buckwheat tea on an empty stomach or low blood sugar will aggravate the burden on the stomach and intestines, greatly increasing the secretion of gastric acid, resulting in gastrointestinal discomfort and other problems.

3. More than diarrhea: long-term consumption of black buckwheat tea will damage their own energy, resulting in severe diarrhea. It is recommended to drink 1-2 times a week.

Black buckwheat tea is a natural drink, moderate consumption is no side effects. However, long-term excessive consumption of black buckwheat tea may cause the following side effects:

1. Dry mouth and thirst: due to the black buckwheat tea has a diuretic effect, excessive consumption will lead to a large amount of water discharged from the body, resulting in dry mouth and thirst.

2. Indigestion: Because black buckwheat tea contains caffeine and other substances, excessive consumption will stimulate the stomach, causing excessive secretion of gastric acid, resulting in indigestion.

3. Sleep problems: black buckwheat tea contains caffeine, excessive consumption at night can lead to insomnia and late-night problems.

4. Buckwheat disease: long-term excessive consumption of black buckwheat tea may lead to buckwheat disease, that is, buckwheat seeds in the ketoacid substances in the process of drinking large quantities of buckwheat, may cause damage to the body.

In summary, moderate consumption of black buckwheat tea is beneficial to the body, but long-term excessive consumption is prone to physical problems. Therefore, it is recommended to drink black buckwheat tea to control the amount of drinking, not more than 3 cups per day.