What's wrong with sandwiches? What'd I miss? I'd think the main concern would be what the sandwich consists of (type of bread + filling) than the fact that the meal is foodstuff between slices of bread. What difference does it make if the food is hot or not? A lot of vegetables are far more nutricious raw, and things like egg are the same whether or not they're cold in a salad or a sandwich as when they're hot.