 Hello, I'm Dr. Sunil Kinney, consultant joint replacement and arthroscopy surgeon at Manipal Hospital's Bangalore. The diet after a joint replacement should be targeted mainly to achieve adequate strength pack in the muscles. This would entail you to take more of proteins in your diet. Carbohydrates are also important but they have to be kept at check. Avoid water fatty food as it tends to build up the fat in the body which would put more strain on your replaced joints.