Seaweed refers to several species of algae, and as we all know, it grows in the ocean. Edible seaweed is salty, astringent and cooling. It is rejuvenating for your plasma, which is what delivers nutrients to your tissues, muscles, organs and bones. In Ayurveda, seaweed is recognized medicinally for its ability to balance the thyroid. While seaweed in excess can aggravate vata types, it is generally a healthy food item to implement into your diet, especially if you don’t live close to a coast.