Very interesting about the L-Tyrosine. There is another supplement that I heard about that supposedly does something similar, as far as appetite suppression. Gymnema sylvestre. Supposedly when you eat it, it interferes with the tongue/mouth to taste sugar, so if you eat a cookie right after, you won't want it because it'll be tasteless. No idea of it's true or not. I should post something in my journal to hear if people have tried it.