Like most white fish, swordfish is high in protein and low in fat, carbs and calories. So, nutrition-wise it is considered a very healthy option suitable for people who follow the Mediterranean Diet. It is also suitable for paleo and keto diets. However, being a large fish, swordfish swordfish has high levels of mercury which is toxic in large amounts. That's why swordfish is not recommended for pregnant women, those breastfeeding, or young children. Even for normal adults, swordfish and other top ocean predators should be eaten in moderation. For weekly consumption it is best to choose smaller fish.