Lychee contains α-hypomethylpropylglycine (MCPG) and the amino acid hypoglycine A two "toxins", they can inhibit glucose synthesis, which significantly reduces blood glucose, triggered by acute hypoglycemia, which is often referred to as the "lychee disease "It can be fatal. The two toxins are mainly found in the lychee nucleus, and the content in the pulp is relatively low.