Its not a good idea to do fasting while the body is still growing.
Bodies usually grow for the first eighteen years.
Keep at the healthy Diet routine.
You will find that there is a long way you can go with that.
A healthy Diet will clean up the body as well, just at a slower rate.
Keep investigating what is healthy for the body.
When you arrive at a mostly plant based diet, are eating most of it raw, juicing organic vegetables, growing and juicing wheatgrass juice, and sprouting sprouts, you'le know your almost there and will never have to be concerned about doctors or ill health.