Personally I don't recommend it while eating. A wealth of fresh fruits and veggies works better to naturally cleanse the system out (due to the high fiber content). Your friend could also try some lax tea. I would occasionally do some Smooth Move at night if I was having problems. However, this should not be done regularly - lax teas can cause problems in the colon if used long-term. One should avoid getting hooked on laxatives of any kind.