There is not enough iodine in foods to cause any harm to the body, according to the National Institutes of Health It is estimated that 3 ounces of shrimp contains about 35 micrograms of iodine. Since the lethal dose of iodine in humans is between 2 to 2.4 grams, an individual would have to consume about 4,800 pounds of shrimp in one sitting to consume a lethal dose of iodine.
On a diet of natural foods, it is rare to get more than 2,000 micrograms of iodine a day, according to the Oregon State website. Most normal diets can only supply the body with less than 1,000 micrograms a day. The food with the highest iodine content are cod with 99 micrograms per 3-ounce serving, a medium-sized unpeeled potato with 60 micrograms and cow's milk with 56 micrograms per 8-ounce serving.