The sea has more than just fish. It also contains massive amounts of vegetation. There are thousands of different plant species in the ocean, some of which are very nutritious. Usually, they are referred to collectively as seaweed (13). Seaweed is popular in dishes like sushi. Many sushi dishes also include a type of seaweed known as nori, which is used as an edible wrapping. In many cases, seaweed is even more nutritious than land vegetables. It is particularly high in minerals like calcium, iron, magnesium and manganese (14). It is also loaded with various bioactive compounds, including phycocyanins and carotenoids. Some of these substances are antioxidants with powerful anti-inflammatory capacities (15). But seaweed really shines in its high content of iodine, a mineral your body uses to make thyroid hormones. Just eating a high-iodine seaweed like kelp a few times per month can give your body all the iodine it needs.
If you don’t like the taste of seaweed, you can also take it in supplement form. Dried kelp tablets are very cheap and loaded with iodine.
Sea vegetables are highly nutritious but rarely consumed in the West. They are particularly high in iodine, which is essential for optimal thyroid function.