Thank you for posting the update.Past experiences with adults,that should know better,has shown me the difficulty of diet change for some people.
The fresh insoluble fiber of the fresh vegetable and grain diet(broccoli,turnips,asparagus,parsnip,brown rice,barley ect) is essential for success with the procedure.The tapioca pudding and sugar(Stevia would be OK) were included in the diet in an attempt to make the diet more exceptabl.In limited amounts, they will not effect the procedure or add to its success.You might try regular fat plain yogurt(that has added probiotics) mixed with the sweetened brown rice.
Vegetables have different fibers,minerial and vitamins and variety should be eaten.Eating one vegetable at a time is Ok.The more the better.Altho it is not on the diet list you might add some butter to the vegetable.One wrong foods can cause colon irritation and delay healing.It is important to stay on the diet.If you can find a way to try the procedure for one week,you should see a positive result and than make it easier for your son to stay with the procedure.The procedure is effective with prescribed medication taken at the same time.
I may be way off on the following suggestion.Perhaps if you made the procedure into a game.Buy him a cowboy hat and tell him the bad bacteria guys are hiding in the colon and causing him his pain and troubles.The only way to remove them is with the procedure enema and diet that increases the good bacteria guys strength and any wrong food he eats increases the bad bacteria guys strength
and causes the good bacteria guys to lose. Explain that story is true.If he keeps diet,you will reward him with a trip to the zoo,toy store or circus.You might also explain it will increasa his skills at play and that it is fot a short time.I also hope someone else comes up with a better suggestion.Please keep me posted.sheldon