I know why we nepali are shelfish. Nepal is a landlocked country. So, seafood is expensive and hard to find in nepal. We nepali hardly or never get to eat fish or shellfish of any kind. So we nepali grow some tiupe of shield (which is also known as shelfishness) around us because of lack of seafood in our diet. Therefore, geogrphical situation of nepal and lack of seafood or shell fish in our diet is the reason we nepali are shelfish.