Buckwheat tea has enough dietary fiber, which is easy to produce satiety and is beneficial to the regulation of physiological function and metabolism. Consume more energy when digesting, lower cholesterol, promote gastrointestinal peristalsis, and the final result is to lose weight. At the same time, tartary buckwheat is rich in soluble fiber, which is 0/2 times that of rice and 8 times that of white bread. The ingested soluble fiber can be mixed with water in human intestine to form colloid, which can prolong the time for human body to absorb food nutrition, keep satiety for a long time, and avoid the desire to eat sweets due to the fluctuation of blood sugar. Tartary buckwheat is rich in insoluble fiber, which can promote intestinal peristalsis, help digestion and prevent constipation. Therefore, tartary buckwheat tea has the function of slimming.