Chia seeds are edible—in fact, they have been grown for consumption by humans dating as far back as 1500 B.C. Chia seeds are higher in omega-3 fatty acids than flax seed and are remarkably shelf stable and rich in antioxidants and nutrients.
Chia seeds may be eaten whole, ground into a flour or added to water—as they sit in liquid, they form a gel.
Chia seeds are a current darling of the health food world, but as with any food, are not a panacea. They do have useful nutritional benefits, however, and some interesting culinary applications.
For more information on chia seeds and other healthy seeds, see 7 Healthy and Delicious Seeds from CL.com.