Sugar Free Ice Cream

My family thinks I am going a bit overboard in our diet changes lately. I bought sugar free ice cream for the entire family. Normally this is something I buy for myself and get regular ice cream for them. It isn't like they need Fenphedra or anything but every little bit helps. I can't really tell a difference in ice cream sweetened with Splenda but they of course think they can. Maybe after all my years of eating light foods I have lost a sensitivity to the differences?