This is how it works:
Women can get fat en mass because men will still want to fuck them, more and more women have adopted this and so the number of slim (what should be normal) women declines, boosting their value immensely. This in turn boosts the value of fat women because those attractive women can now be even pickier, all the while men are attempting to better themselves to get women that 90% of them won't, leaving men who are more attractive than these women fighting amongst themselves for a spot at the table.
Men who don't compete or just can't, can be seen here
hope this makes sense im pretty drunk