Thank you, @NJSue.
Actually, I think that Leach’s concepts do address the problem I was talking about because apparently, she allowed scheduled snacks. I think she would have approved of offering a child like my son an after-school snack as long as other children in the family were also offered a snack at that time (i.e., it would be a “time when the family eats”), rather than making him wait until 6 p.m. to eat when he had not eaten since 7 a.m. However, we can’t be sure since she was writing about a younger age group.