I know that when I was little and my mom bought all my groceries your "kid tested, mother approved" slogan really worked. However, I've grown up. I'm in college now. I buy my own cereal and that ad campaign doesn't entice me to buy your cereal anymore. Cereal that is unhealthy appeals to me, I no longer want cereal that is "mother approved."
Bottom line, Kix, you should get a new slogan. Something about how the delicious little balls of fluffy cereal taste great, something catchy, maybe rhyming even. Then I'll buy your cereal again.