I don't think you'll get an exact answer here, if that's what you're looking for. I suspect the answer is highly individual and that many factors go into a Dr's recommendation on IP.
If I were a Dr, I'd look at if BMI had fallen to an unhealthy range, if a person's period had stopped, if they couldn't be trusted to eat on their own or alternately were binging to the point that it was detrimental to their health.
splitimage
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba
