Because saccharin is not the "refined" of sugar. It is a sweetener synthesized from chemicals. Its main ingredient is saccharin sodium, and its sweetness is equivalent to 500 times that of sucrose. Add one ten thousandth of saccharin to food to taste sweetness. However, saccharin is not absorbed by the human body like sugar, and is excreted quickly after eating, which is not beneficial to the body. In particular, some impurities cannot be purified during the production process, such as heavy metals, ammonia compounds, arsenic, etc. After these impurities are consumed, they will have a certain irritating effect on the mucous membranes of the stomach, kidneys, and bladder. Long-term consumption can easily cause chronic poisoning and symptoms such as nausea, vomiting, abdominal distension, and oliguria.