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Eating litter could certainly be a problem as is may cause an intestinal obstruction. Is it the scoop able clay litter? Does he eat other kinds of litter?
I would recommend trying another type of litter first. Its possible that he will not recognize a different material as a food item. As for an alternative, you can redirect him and offer him kibble when you see him eating his litter. You may also want to try offering him kitty grass. This can be purchased in pet stores and is a container that contains grass seeds to be grown indoors. Giving him this alternative may distract him from eating his litter. I would also recommend changing his litter. There is another scoop able kind made out of wheat that is different enough that he may not recognize it as a food item. Of course, he should also have a thorough veterinary exam and possibly blood work to make sure he truly is healthy. If he has a dietary deficiency, then he may continue to want to eat non-food items and this may cause a problem in the future. Adding a multi-vitamin to his diet (one made for cats, of course) may also help him but if he is on a commercially prepared cat food, this should be complete and vitamin supplementation is not usually necessary.
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