Ron ~
If it is really an allergy to soy, you need to talk to your Health Advisor and switch over to the whey-based products and avoid the soy-based products.
You can do a search on the MakeMeThinner Forum for a list of whey-based products. I've written about them many times.
I have a number of successful losers on the soy-free formulations.
Keep on keeping on - enjoy and employ the power of the TSFL Program, the fat-burning state and the wonderful Medifast products!