Gutter oil is harmful to the body by increasing the burden on the organs, cancer, diarrhea and so on. 1. Increase organ burden: Gutter oil contains aflatoxin and other harmful substances, the body in the long-term intake will aggravate the burden on the kidneys, liver and other organs. 2. Cancer: Due to the fact that gutter oil belongs to unqualified production, while the rancidity index far exceeds the national regulations, the hydrogen peroxide value exceeds the standard, which will produce a lot of carcinogenic substances, so the long-term use of which may cause liver cancer, kidney cancer, rectal cancer and other diseases. 3. Diarrhea: Gutter oil is extremely unhygienic, poor quality, and also contains toxins, long-term consumption can cause diarrhea, enteritis and other diseases. It is recommended not to consume gutter oil.