History again

Historically, OA began with three people using methamphetamines (doctor prescribed) to lose weight who got together to start their own twelve step program. True to their OCD streak, they abandoned sitting around a table for one person leading a controlled meeting (like a school room). It rewrote the 12 steps completely, dropping most of the core concepts and merged with Gluttons Anonymous a Texas group that was seeking serenity.
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OA has always been driven by images of physical recovery, a highly compulsive borderline anorexic is completely acceptable as a leader. Someone who has lost 200-300 pounds, but who is still overweight is not acceptable at all.

As a result the group has a heavy dose of highly OCD women in the mainline leadership, leavened with others.

Also, unlike other 12 step groups, OA has had strong exclusionary strains, mostly with groups that exclude men.

The saving grace of OA is sterling literature and a willingness to embrace its splinter groups. As a result, it is easy to create or find a support group for any type of person who wants to learn to live without being driven by, or drowned by, food.