Sorry for having assumed things...however when someone says their keep anything on sand...that's going to automatically make anyone (be they someone very experience on this forum, or someone with absolutely no experience with reptiles) assume that the entire substrate is sand. When someone comes on to ask a question, and I mean anyone...I'm not really "pointing" this at you...they need to be very thorough in describing what's going on if they want an appropriate response. Also, as far why the leo may be eating the sand, no one said, at least I don't remember anyone saying...that you said she was eating sand because she's hungry...vitasand encourages eating because of what's in it, and some just prefer it over calcium powder. Vitasand may even encourage eating more than regular calcium carbonate sands because it has vitamins in it. As far as digestability, don't ask a chemist, they won't be able to give you an appropriate response. I happen to be a sophomore prevet student and will probably end up getting a chem minor b/c I'm required to take so much chem to begin with I'll only need one more class...lol. I'm not saying I know as much as a vet or chemist...but I know enough to know that chemist wouldn't be able to tell you the digestability of sand in the leopard gecko digestive tract. Sand is not in a leo's digestive tract long enough to be digested by any significant amount because it is digested very slowly. Also, if the intake is faster than the digestion of stuck sand and/or passing of sand...that's where problems are going to occur and impaction may result. The other problem with calcium carbonate based sands is something to do with antacids...I don't remember all of that information...hopefully marcia or robin (i forget which one knows...maybe both...lol) will read this and can explain that. Now again, I do believe leos can be kept on sand safely...but I also believe that if a leo is observed eating or licking the sand it shouldn't be kept on it at all. Anyway, that's all I have to say...and again I apologize for having assumed things.
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Christina

Leopard Gecko Morph Descriptions
2.3 leos
-0.1 tangerine het rainwater albino w/jungle background (Blinkers)
-0.2 jungles (Vahz & Skissor)
-1.0 tremper albino (Spitfire)
-1.0 tangerine rainwater albino (Bronx)
-ignorance is not to be punished when one is trying to gain knowledge...what scares me is the vast number of people who, when given the information to gain knowledge, choose to ignore it.