Here’s what a hundred-year-old magazine said about when to eat:
When to Eat
Do not eat between meals. East regularly, but when not hungry, eat sparingly.
Do not eat after violent exercise.
Do not eat when excited or fatigued.
East sparingly on hot days.
Do not eat within three hours of retiring.
Do not exercise violently, or sleep after a meal.
Eat regularly at specified times. This accustoms the stomach to receive food at these times, and encourages proper digestion.
Do not overeat; rather undereat, and leave the table unsatisfied than risk the danger that attends overeating.
Animals seldom eat when ill. Instinct is a good judge.
A normal, healthy person should be hungry at meal times. But if not hungry eat only a piece of fruit to retain the normal rhythm. A day fast often gives the digestive system a much needed rest. A short walk, before breakfast, helps digestion, and aids bowel movement.
American Cookery (August – September, 1922)