Has anyone heard of Susanne Eman?

[Tea Earl Grey Hot]

Actually the main reasons behind feederism are erotic. This is a fetish that she and many others get a kick out of it for whatever reasons sort of like bdsm.

I agree, and I was reading an article one day about the psychology of such an erotic fantasy (see the quotes below):

http://bitchmagazine.org/article/feast-of-burden

To publicly eat when you're already fat might be one of the most transgressive behaviors available to the modern woman. And though feeding pornography eroticizes the pain of overeating, it also emphasizes a certain possibility for female pleasure that is decidedly antagonistic to the heteronormative model - in other words, there's no penis necessary. (In his essay on porn in the book Fat: The Anthropology of an Obsession, anthropologist Don Kulick suggests that feeding pornography is a rejection of the penis as the "ultimate bestower of rapture.") Feeding pornography also reconfigures depictions of female pleasure when it offers obese bodies as visual "proof" of female sexual fulfillment: If eating is sexy, the body of a 400-pound woman itself is testament to her satisfaction—no stagy wailing or sheet-clutching required.

A "feeder" (usually male) encourages the "feedee" (usually female) to gain weight, often literally placing the food in her mouth. The ultimate (if generally unattained) goal of the relationship is for the feedee to become immobile, and this eventual incapacitation is fetishized: Feeders get off on the idea that their feedee might one day become too "satisfied" - and too obese - to move, thus making them completely dependent on their feeder. It's an extreme manifestation of the idea that masculinity in men involves eroticized dominance over women.

I think this sort of behavior is really unhealthy, though, and it is something physically self-abusive. I don't have much respect for these people to be honest.

But again, it's not my life, it's theirs.

Those are good summaries I suppose. There is of course much more variety in the real world than a single definition can encompass.

Not all feedees are interested in becoming immobile. Some fantasize about it but it's just fantasy. Many just put a limit like "I'm not going past 250lbs" etc.

Not all fat admirers (FA's) are interested in feederism. Many find it abhorrent.

Not all "fat acceptance" people are fat admirers and vice versa.

There are "stuffers": people who once in a while overeat to distend their abdomen. They're not necessarily interested being fat, they just get off looking pregnant and feeling full. Related to this are people into "inflation" who use air pumps. The two groups often overlap.

It seems that I am now a candidate for weirdest member! Oops.