From Wikipedia, "Salvia hispanica (Chia) is a plant of the genus Salvia in the family Lamiaceae native to Mexico. It was cultivated by the Aztecs in pre-Columbian times, and was so valued that it was given as an annual tribute by the people to the rulers. It is still widely used in Mexico and South America, with the seeds ground for nutritious drinks and as a food source."
"Chia is grown commercially for its seed, a food that is very rich in omega-3 fatty acids, since the seeds yield 25-30% extractable oil, mostly α-linolenic acid (ALA). It also is a source of antioxidants and a variety of amino acids.[1]"