80-90% of human iodine comes from food, 10-20% is obtained through drinking water and 5% from air. Therefore, iodine in food is the main source of iodine for the human body. Land-based foods have the highest iodine content in eggs and milk, followed by meat, freshwater fish have lower iodine content than meat, and plants have the lowest iodine content, especially fruits and vegetables. Marine organisms have high iodine content, and the foods with the highest iodine content are seafood, such as kelp, nori, fresh scallops, dried ark, dried clams, dried shellfish, mussels, sea cucumber, jellyfish, lobster, etc.; kelp has the highest iodine content, followed by sea shellfish and fresh sea fish. Foods containing iodine that should be avoided for at least 1 week before the 131 iodine scan include: iodized vitamins, iodized salt, sea fish and crustaceans, milk, ice cream and cheese, canned fruits and vegetables, cured or spiced meats (ham, bacon, salami, etc.), white bread, salty foods, fast foods, tea, lemon juice, etc. Iodine-containing food list (per 100g) 1. Wakame (dried) (15878 micrograms) 2. Nori (dried) (4323 micrograms) 3. Pistachio nuts (37.9 mcg) 13. Quail egg (37.6 mcg) 14. Turkey leg (33.6 mcg) 15. Yellow sauce (19.8 mcg) 20. lamb liver (19.1 mcg) 21. willow matsutake mushroom (17.1 mcg) 22. chick pigeon (16.3 mcg) 23. tuna (14 mcg) 24. cuttlefish (13.9 mcg) 25. pepper powder (13.7 mcg) 26. chicken (12.4 mcg) 27. pine nuts (12.3 mcg) 28. pumpkin seeds (fried) Shark fin (dried) (10.9 mcg) 30.Walnut (10.4 mcg) 31.Beef (lean) (10.4 mcg) 32.Cabbage (10 mcg) 33.Soybean (9.7 mcg) 34.Sweet noodle sauce (9.6 mcg) 35.Green pepper (9.6 mcg) 36.Almond (8.4 mcg) 37.Instant noodles (8.4 mcg) 38. Almonds (fried) (8.4 mcg) 39. sweet almonds (8.4 mcg) 40. pepper (8.2 mcg) 41. white pepper (8.2 mcg) 42. Black fish (6.5 mcg) 49. Duck egg (5 mcg) 59. kidney beans (4.7 mcg) 60. carp (4.7 mcg) 61. hazelnut seeds (fried) (4.4 mcg) 62. lamb (hind leg) (4.1 mcg) 63. pineapple (4.1 mcg) 64. chicken powder (3.9 mcg) 65. bak choy (3.8 mcg) 66. glutinous rice (purple) (3.8 mcg) 67. millet (3.7 mcg) 68. Ham (3.6 mcg) 69. Pheasant (3.5 mcg) 70. Soy sauce (2.4 mcg) 79. lotus root (2.4 mcg) 80. rice (2.3 mcg) 81. pork (lean) (1.7 mcg) 82. cilantro (1.5 mcg) 83. venison (1.5 mcg) 84. milk cucumber (1.3 mcg) 85. chicken liver (1.3 mcg) 86. onion (white skin) (1.2 mcg) 87. potato (yellow skin) (1.2 mcg) 88. Beef in sauce (1.2 mcg) 89. Eggplant (1.1 mcg) 90. Mangosteen (1.1 mcg) 91. Beef tenderloin (0.5 mcg) 100.Zucchini (0.4 mcg)