Over 5,000 non-parasitic flatworms (pranarians) online?
I'll tell you what there are very few of online - breatharians who have been around for very long. At least that appears to be the case judging from the Breatharian forum here at CZ.
Virtually all living things need food to live. Last I looked, most humans were living things - though some do appear to be a bit brain dead. Of course, the brain is like any other organ - to survive and function properly it must be nourished. Which might explain a lot . . .