Food & Drink
I was going to suggest The Gentle Gourmet, but I suppose you mean of the frozen variety? http://www.gentlegourmetbandb.com/Dinners-Table-d-h-tes.html
Deborah, who owns the Gentle is great and does all sorts of different menus for those with allergies, be they to lactose, wheat, nuts or whatever.
Really not sure I know of any restaurant that does wheat free anything; there is a great bio store in the 14th (elan nature) 107 bis ave du Gen Leclerc that has one of the biggest and nicest selections (including ready made items) of bio products - I think they do wheat free stuff too - worth checking out if you are on that side of town
Thought you might be interested in this forum posting http://paris.angloinfo.com/forum/topic.asp?topic_id=7380