Mee siam is thin bee hoon in a sweet, sour and spicy tamarind and taucu gravy, topped with egg, a few prawns, tofu and chives. The wet version lands around 470 calories, the vermicelli forming the base while the gravy brings oil and sugar. It tastes light and tangy but the numbers are middle of the road.
The dry stir fried version, mee siam goreng, comes out about the same total, just with the calories coming from wok oil instead of gravy. Either way, the prawns and egg give you some protein, so it is not empty, but the rice vermicelli and oil are the bulk.