I'm day 4 post-op and realized as I take in more of the Protein shakes, I'm immediately getting diarrhea from them. With so little nutrition going in, I don't want to immediately be spilling it out. Any ideas?

Yes I did have that problem. My idea probably won't work for you. I had the same problem, but after I was a week out. At my 2 week follow up appointment, I told my doc that at soon as I started to drink them I could feel my intestines filling with water and had to run to the bathroom. His solution was: "Stop drinking them. Let's get you on solid food." haha LOVE my doc! Now I am not saying that is the solution for you, but I was SO GLAD he is a little more liberal with the "rules." PS - I haven't had a shake since he told me that last Monday!

The only one that had that effect on me was bariatric advantage. I actually use one a week to keep me regular. Lots of fiber in that baby lol. Maybe you could switch them up, see if a different one has a different affect or try mixing it with milk maybe add a blended banana or some applesauce?

Its probably not the shakes alone. It is more likely the liquid diet in general. I had the runs my first two weeks. But after starting on more solid foods it passed.

Also watch what your using in the shakes, you may be sensitive to milk/lactose.

I had the same issue during my second post-op week. Turned out I'd developed lactose intolerance, or more likely that a very mild case of intolerance I'd had before had become more pronounced. I got some lactose relief pills (Lactaid, or most drugstores have their own brand - I got mine from Walgreens) and they solved the problem completely.

Liquid in, liquid out. If you are using a powder and making them at home with milk, consider switching to soy milk or almond milk or lactaid milk. You might have a lactose issue. You might try a pre-made one as most of those don't have milk/milk derivatives in them.