DEAR DR. BLONZ: What is carrageenan? DEAR DR. BLONZ: A workout friend is a nutritionist, and she continues to tell me that the calcium from fat-free milk products is not absorbed into the body effectively. She insists that calcium needs to be consumed with a little fat in order to be absorbed. She says that my body is not absorbing any calcium from all the fat-free milk and yogurt products I consume. Do I need to switch to low-fat milk products?