Is your appetite consistent?

My weight is fine but my appetite varies enormously. I have about one day a week where it seems I can't eat enough and I eat meals and snacks and grab a slice etc. Most of the week I snack on blackberries, or an apple and eat very tiny amounts. Today for instance I am stuffed after 10 berries and coffee, I could not contemplate eating more. Yesterday I had 3 potato pancakes, two eggs, 4 rashers of bacon, a pomegranate ...all before 8.