I have read articles that have stated there are various conditions caused by too much calcium in a chameleons diet. But, Chameleons can actually dispel extra calcium from their systems. So, I personally think that the chameleons that were mentioned in the articles that I read must have had underlying metabolic issues that kept them from their normal bodily capabilities. That is just a thought. There is a member here,
@kinyonga, that seems to be able to find a related article/study in regards to questions like these. Hopefully she will chime in here!