I would not reccomend lifting, that can cause problems: blockages, hernias, bowel twists, and all sorts of things! I would reccomend finding something else that is much safer since our bodies are more delicate. There are plenty of other stuff you can choose
As far as diet goes: Fruits, veggies, and morningstar veggie burgers, beans, greek yogurt, Ensure protein drinks, Boost drinks, etc.