That people buy more, less healthy food when they are hungry is pretty well backed up, I understand. (Googling gives this right away)

Your suggestion has a possible "remembering just how good my favourite unhealthy food tastes" counter-effect.

My experience is that how food tastes changes massively depending on my hunger, so you need to bear in mind that "how good my favourite food tastes" will likely be "not very" when you've just eaten.

For example, I play sport for about 3 hours on Sundays, and immediately after (before leaving the pitches) I drink a litre of milk, mixed with milk powder (to make double strength milk), mixed with chocolate Ovaltine powder. It tastes great to me at that point in time. I tried it before a practise once, and it was just awful.