Could you elaborate a bit? Based on my confused search queries, it seems like coffee might interact with anti-depressants? (I might have completely misunderstood the point though)

Does this imply that coffee (not caffeine) can act alone as an antidepressant?

Not really, since coffee is a mixture of dozens of MAOIs and other bio- and psychoactives. Some of them have been hypothesized to cause anxiety and depression. Some of them are also neurotoxic.

I can totally attest that coffee has multiple psychoactive substances in it. I need at least one good cup a day. Preferably made via the espresso method with 'good' beans. This seems to extract the most 'chemicals'. The satisfaction scale goes down from there. Not so good beans, non steam/pressure extraction method, all don't hit the spot. A good cup of coffee - not so easy...

Yep, I can attest to that as well. I sometimes stop drinking coffee and notice that there seems to be no amount of tea that can make the withdrawal symptoms go away.

Just to cross check: More coffee -> less MAOI -> more serotonin -> less depression ?