I have been getting very nauseous in the afternoons after drinking the protein shakes. Almost to the point of unbearable. Yesterday, I found the clear liquid isopure zero carb and I think they are going to work, crossing my fingers. I am wondering why the others make me do sick? Referring to the comment above about the doctor saying that the body does not like to take in more than 25 proteins at a time might just be what is the matter with me. I am a little worried over it and if anyone out there has an answer let me know. I personally like the isopure zero.