DHA is a major structural fat found in the brain and eye accounting for up to 97% of the total omega-3 fats in the brain and up to 93% of the omega-3 fats in a specific part of the eye, called the retina. The human body can’t make its own omega-3 fatty acids, which is why you need to include them in your diet. About 80% of the brain growth occurs within first two years of life, and most of the brain growth is completed by 5-6 years of age.