Dr. Siemons clearly states one vegetable per meal. While many people lose quite satisfactorily when mixing vegetables, it is a place to review if losing slows. You can read more hcg diet related articles at www.hcgweightloss.com
I don't really like what this diet can do to the system. If you are on it, it should have been at your doctor's advice, so that they can monitor your condition. The doctor can explain it to you.