Octopus has the reputation for being a bit chewy, however, when properly cooked, it's tender. Octopus is rich in vitamins and minerals. It's also low in fat, making it a great source of complete protein for people trying to manage their weight. This can depend on how it's prepared, however. Frying it as calamari or cooking octopus in butter or oil can add extra fat and calorie content to your meal.