Avocados are considered high in fat, but healthy mono-saturated fats are really good for the heart. Avocados also contain vitamins K, C, B5, B6, E, and potassium. Fresh mango is considered an antioxidant and supports eye and heart health. Prawns are a good source of selenium (an antioxidant), and also contain high levels of zinc, which is important for a healthy immune system.  So this is very much a super healthy salad!