1, yes, there is a dish called milk purple potato syrup, which is a delicious dish. The main ingredients are sweet potato and milk. There are 20 kinds of amino acids that make up human protein, of which 8 kinds can't be synthesized by human body (there are 9 kinds in infants and more histidine in adults). These amino acids are called essential amino acids.

2. If the protein we eat contains all essential amino acids, this protein is called total protein. Protein in milk is all of protein.

3. Purple sweet potato is a kind of food crop with high yield and strong adaptability, which is closely related to industrial and agricultural production and people's life. In addition to being the main grain, truffles are also important raw materials for food processing, starch and alcohol manufacturing industries, and roots, stems and leaves are excellent feeds.