Greymar I have never been a large breakfast eater, I have a couple of crispbread, but that is all and by 12.00 I am getting hungry, so eating at lunch time,usually 12.30 - 1.00 feels quite right. When I had my light meal at lunch time I found with having only a light breakfast, by mid-afternoon I was really flagging and hungry and tempted to snack. By having my main meal at lunch time that keeps me full until supper time, when I have a light meal.
And as others have said, eating a big meal in the evening, especially after 7.00pm, gives me indigestion. In fact even when we go out for a celebration meal, we prefer to go out at lunchtime rather than in the evening.