#2. Grapefruit and avocados
High in both vitamin C and antioxidants, grapefruit increases the natural cleansing processes of the liver. A small glass of freshly-squeezed grapefruit juice will help boost production of the liver detoxification enzymes that help flush out carcinogens and other toxins. Avocados helps the body produce glutathione, a compound that is necessary for the liver to cleanse harmful toxins.