Fish has a reputation for being low calorie, high protein “brain food,” thanks to the long strands of polyunsaturated essential omega-3 fatty acids (popularly referred to as “omega-3s”) found in fish oil. The human body can’t naturally produce omega-3s, but yet they’re needed for a healthy body, inside and out. Although the link between omega-3s and heart healthhas long been known, several new studies present even more evidence that fish high in fatty acids is essential for total-body wellness.