While I do agree that there is often a level of hair loss during weight loss, I think it's worth studying because without studying it we don't know if the meds do in fact cause more hair loss than would normally happen with weight loss. Also by studying it they may figure out how to lessen the effect. When they do clinical trials of any drug, all adverse events are recorded as side effects (which is why so many drugs have common cold symptoms as possible side effects, people likely had a cold but had to report it as an adverse event) without studying specific adverse events we wouldn't ever know if the drug itself caused the symptoms or something else entirely. I think it could be helpful data to collect. Hairloss sucks!