While away for weekend, I ate foods I used to eat before eating for Blood Type. Been on this program for about 4 weeks 80% of time. After 36 hours, I had problems with sinus and had to cough every 10 minutes. I did not have as many problems with food before I began eating for an O type. I wonder if the body reacts more strongly to the wrong foods, Dr.D. after eating the right foods? I hadn't eaten a hamburger for 30 years. I've been eating turkey & fish and added lamb when I began this program. I rushed out of the hotel to Denny's and ordered a hamburger plain. Not my idea of breakfast or even dinner.Also ordered a glass of grapefruit juice.In the past, it would of been pancakes and eggs. But I was desperate by this time. I could not stop coughing. Within 20 minutes or less, I begin to feel so much better. What a surprise this was. It certainly works.