Depending on the region and culture, dinner can be the second or third meal of the day. The simplest dinner consists of meat, fish, poultry, or other high-protein foods, served with 1 or 2 vegetables and / or with cereal or rice grains - typical of bread, but potatoes, rice, pasta, and noodles are also common. One or all of these components can be served with hot or cold sauce or sauce.
In the past, humans were likely to spend their morning time providing 1 main meal of the day. The biggest part has been eaten during the day, after which humans take a nap. The rest can be eaten at night and / or for breakfast tomorrow.
Best regard to @good-karma and @surpassinggoogle