I have measured out my life with coffee spoons.- T.S. Eliot
"No, coffee doesn't suppress the appetite." I heard my mother-in-law say this from across the room and turned to interject in the conversion. "Yes it does. It's well known. What do you want to bet?" People turned to look if she would take the bet and she weighed her confidence versus mine and finally decided it wasn't worth it.
I work to hard to keep my reputation as the person in the family who debunks the craziness. Both sides of my family have a habit of reading this one thing this one time and related it back as known fact. "Did you hear that the Paleo diet has been proven to cure autoimmune disease?" I hear this stuff, read the peer-reviewed studies in medical journals, and debunk the insanity.
Long story short on this one (too late), science is now inconclusive if caffeine is an appetite suppressant. More recent studies have not shown a link. Nicotine is an appetite suppressant and caffeine does increase the effects - but just caffeine alone? Inconclusive.
Oh well - it wouldn't be science unless it was sometimes proven wrong. I'm still going to drink all that coffee - it protects from all sorts of stuff like liver cancer and liver cirrhosis.