Eating two meals a day is generally beneficial for health, though a very light third meal of easily digested food may be appropriate under certain circumstances.

Original passage

The practice of eating but two meals a day is generally found a benefit to health; yet under some circumstances persons may require a third meal. This should, however, if taken at all, be very light, and of food most easily digested. “Crackers”—the English biscuit—or zwieback, and fruit, or cereal coffee, are the foods best suited for the evening meal.