3. Accentuate the positive. Negative, or aversive, suggestions, like "Doughnuts will sicken you," work for a while, but if you want lasting change, you'll want to think positive. The most popular positive hypnotic suggestion was devised by doctors Herbert Spiegel and David Spiegel, a father- son hypnotherapy team: "For my body, too much food is damaging. I need my body to live. I owe my body respect and protection." I encourage clients to write their own upbeat mantras.