"Metabolic Bone Disease is an umbrella term referring to the weakening of bones due to a deficiency of certain minerals, specifically calcium, phosphorus, and vitamin d. It can be caused by either a dietary deficiency or lack of adequate exposure to sunlight".
http://en.wikipedia.org/wiki/Metabolic_Bone_Disease
$$beni€€ aid..."I'm not interested in other reptiles.And this is a chameleon forum isn't it?"...yes, it is a chameleon forum, but I only mentioned other reptiles to find out if you were saying this is something specific to veileds or if you are saying its something that occurs in all/some/other vegetarian reptiles.
You said..."A proof for that is hasek's cham that has MBD because of this...You can see it by deformed/croocked legs"...I don't know who hasek is and although hasek's chameleon may have MBD how do you know it came from eating veggies/fruit?? MBD is weakened bones due to calcium/phos./D3 imbalance (and acutally, vitamin A plays a part too). If it ate insects that were not gutloaded properly and/or not dusted with calcium that could have led to the MBD. If it didn't get any exposure to sunlight or UVB (without glass or plastic between the light and the chameleon) or any D3 supplement it could have led to MBD. If the chameleon suffered from kidney disease, it could have led to MBD. The gutload or supplements could contain things that threw the chameleon's system out of balance. There are numerous reasons that a chameleon gets MBD.
Even if hasek fed the chameleon only veggies/fruit you still could not say for sure that the chameleon didn't develop the MBD due to some other reason. You would need confirmation.
In over 12 year of keeping/raising/breeding veileds, I have had very few cases of MBD in them and those cases were all caused by my lack on inexperience when I first started keeping them. I also gutload with veggies and greens.
You said..."PS: (@hasek: if i insulted you, I didn't mean it..)"...no offense taken.
BTW...sorry Hasek, that your chameleon had MBD.
skeleptica...thanks, but sorry...I did mean other reptiles since the veiled is the only one known to eat a lot of "vegetation" and for the reason (way) above.