LC hits everyone differently, but PEM recovery is mostly a long, slow process. I still biked, but 5 mi increments instead of 30, with naps and lots of breaks. I have a friend in his 70's that is quite robust, and his LC took 9 months of slowly coming back. I didn't change my diet because it is already strict (gluten free, minimal processed foods, due to celiac and colitis). Getting enough sleep, rest, and escape from stress is important.