Trisaccharides are carbohydrates composed of three monosaccharide molecules connected by glycosidic bonds. They are not as common in nature as disaccharides and monosaccharides, but still play an important role in the metabolism, nutrient absorption and cell function of some organisms. Common trisaccharides include maltotriose. The functions of trisaccharides in the human body include providing energy, promoting intestinal health, regulating blood sugar, supporting the immune system, etc. They are not only an important source of energy for the human body, but also indirectly promote overall health through their effects on intestinal flora.