For someone with a lot of weight to lose on Dukan, it's easier to eat Breakfast, Snack, Lunch, Snack, Dinner... but most of us are looking for a stone or two so if you're not hungry, best not get into snacking habits (as I did!)...
I've even stopped having a dessert in the evenings midweek as I realised I didn't need it, but because it was on my "menu", I simply ate it obediently, DUH!