Yes, ice cream, cheese, milk and even unsweetened yogurt all cause me to have sinus infections--even raw goat milk. The raw goats milk was the least innocuous. There are times when none of these bothers me. At one time, about four years ago, if I drank milk (yes, even raw) I would choke on a huge volume of white mucus. I discovered that if your spleen isn't working properly milk can cause a huge mucus buildup. I went to work on my spleen and, lo and behold, I could drink milk once more without any ill effects. I also learned that allergies and sensitivities to foods are related to how much of that substance is stored in our bodies, and certain deficiencies (vitamin, mineral or enzyme) deficiencies we may have. Some allergies may be overcome within seconds of taking the substance you are lacking. For instance 'swimmer's ear' can be 'cured' by taking the EFA'S that person is lacking. Swimmer's ear usually occurs on a hot sunny day when one has been out too long in the sun and gotten a burn, effectively burning up precious EFA's. So, I think this may help people understand why they may be sensitive to a substance at one moment, and not another, or why two people may eat the same food, but only one becomes sick.