Hmm consumables....good question. There isn't really any formal research on that, I'm afraid. I do know that there are a lot of supplements and things which increase lucidity and vividness in dreams.

Generally speaking, all I can say is that anything which doesn't feed your brain would probably be bad. So junk food instead of healthy food, for example. You need to have a sharp mind and a well-fed brain in order to get lucid.