I found the article listed below on some of the benefits.
8 Health Benefits of Amaranth
|Info taken from: http://www.3fatchicks.com/8-health-benefits-of-amaranth/|
Amaranth is a genus of herbs that contain over 60 species with a variety of colors and uses. Many of these species are considered weeds; however, people around the world consume amaranth as grains, vegetables and cereals for their many health benefits. Amaranth has a long history and has been in use for many centuries by many different cultures.