JennaRN said:

Gallbladder ultrasound monitoring on gallbladder risk: given the known gallstone risk with rapid weight loss, my doctor orders gallbladder ultrasound…

Pushing back on JennaRN here. Pushing back on the anecdote-stacking. Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.

Adding the numbers, since they settle part of this. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.

Dr.LipidDallas said:

Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.

There is a second half to this that has not been said yet. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.

One thing that is still open after Dr.AddMedPHL’s answer:

How would you tell the difference between that and the alternative explanation?

OP back with an update, since a thread like this is useless without one.

Reporting back for the archive rather than for the thread: I did the narrow version of what was suggested, gave it the full interval, and it settled. Posting it because threads without a follow-up are half a thread.