Any kind of exercise routine is good. Low impact works fine. Diet: what works for me is low carb, low sugar. Its kind of the Drinking man,s diet without the alcohol. ( No Bread). then 1 time a week, Take a break and have some kind of Junk food. If feeling starved between meals, have a some fruit ( not out of cans or bags) or It works for me and most of the time I have energy and dont feel hungry.

My Step son is a bodybuilder and for Diet: He does a low carb ( meal a day spread out all day) with meal replacement drinks or smoothies ( add fruit) Whey protein and Muscle milk comes to mind, although there are others .for quick energy, he drinks Coffee just like the rest of us.