My fantastic meal-planning book* gives a menu for every single breakfast, lunch, and dinner of the year. Let's take a look at March 26:
Breakfast: Bananas, oatmeal with milk and sugar, waffles with syrup and butter, coffee, and cocoa.
Lunch: Baked beans, cole slaw, catsup, cornmeal muffin with butter, milk, and canned peaches with cream.
Dinner: Meat pie, creamed onions, buttered turnips, radishes, bread and butter, coffee, and cherry pudding with sauce.
I think you are meant to eat everything on the menu. Not choose between, say, oatmeal and waffles. Eat them both. Go ahead. If you can.
*
The American Home Diet, or, What Shall We Have for Dinner?, (1920)