All things in moderation. I'm personally doing a body cleanse this week . But i might snag another for a cheat day. I'm not drinking any sodas; just water and watered down cranberry juice (and not that cocktail crap either).
Over the years, I've found that if i sick to drinking water and doing a good colon cleanse a few times a year, you can maintain a good level of health.
With that said, someone going full vegan can only expect to outlive the average person by MAYBE 3 years. Have some fun. Water and fiber are your friends.