While going off on a rant may not have been the best way for that Facebook poster to get his point across and perhaps he would benefit greatly from reading Dale Carnegie's How to Win Friends and Influence People, he was absolutely correct: a large rat every week is way too much food for any adult boa, and yes in general boas have slower metabolisms than pythons do so they should be fed less often.
A general rule I like to use when feeding is to take the animal's age, add one, and that's the number of weeks between feedings. So, a one year old is fed every two weeks, a two year old is fed every three weeks, etc.
Once the critter is eating every four weeks I'll leave females on that schedule, males will get pushed out to six weeks, and I offer feeder rabbits (because they're low in fat) that are about 75% of the boa's girth so there really isn't a food lump visible after it eats.
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