The National Osteoporosis Foundation recommends a bone density test of the hip and spine for all women age 65 and older and all men age 70 and older. They also recommend testing for postmenopausal women under age 65 who have risk factors for osteoporosis. Fish oil is loaded with omega-3 fatty acids, which the body needs but cannot manufacture. Omega-3 fatty acids are involved with brain function, growth and development. They also help reduce inflammation. Being deficient in these fats can lead to health problems, including heart disease.