The fad health crap is just as bad as conspiracy theories. At least in my opinion. Probably worse because if someone follows them to the letter they could potentially die from either poisoning themselves or failing to receive proper medical treatment.
At my old work doing online advertising we used to see a lot of MLMs and junk health products. Miracle Acai berry drink were really popular at the time, and we even had a guy who called in to get help for advertising his book on getting rich with online advertising, ha! I had one coworker who, despite seeing the same idiots peddling bullshit bought into the Kangen water scam.
Unfortunately no, I heard about that miracle berry on QI however and it looks interesting.
People want something to believe in, something they can identify with and call "theirs". Homeopathy fulfills this for a lot of people, just like religion, sports, comic books etc. But I would agree that the "health crap" can be pretty dangerous.