The main sources of protein are animal based foods. For example meat, fish, poultry, milk, cheese and eggs.
Rice and fish.
Raw fish and rice.
In Ancient Japan the main thing they harvested was rice.
Fruits and vegetables are the main sources of vitamins.
Beans, beef, chicken, goat, cheese.
You can get energy from Carbohydrates, Fat and to a lesser extent protein.
One of the main ingredients in a protein shake is protein. Protein for a shake can be added in various forms. You can get protein from different sources such as - protein powders, milk (different kinds), peanut butter, eggs.Fruits and vegetables can also be added to supply fiber and nutrition to your shakes as well.
Pork, chicken and fish.
Venison and fish, instead of turkey, were probably the main sources of protein at that first communal gathering.
Cholesterol is a type of fat. There are two main sources of cholesterol: 1- liver produces 2- certain foods
In my opinion, (Foods not snack right?) There is Rice, Noodles, and Fish. There's lots more but I think those are the three most common ones.