What works for me is to eat less at lunch. How? By having a big breakfast. By the time lunch comes I am not starving, and it is easier to have a moderate lunch

What works for me is to eat less at lunch. How? By having a big breakfast. By the time lunch comes I am not starving, and it is easier to have a moderate lunch. This makes it easy not to be drowsy. Having a big breakfast has also the advantage that it is a great motivator to get up in the morning :)