NOW
WOULD YOU PLEASE PROVIDE SOME DOCUMENTATION AS TO WHO REGULATES THE
INGREDIENTS THAT ARE IN COMMERCIAL FOOD

http://www.fda.gov/cvm/index/consumer/petfoodflier.html

"The Act does require that pet foods, like human foods, be pure and wholesome,
contain no harmful or deleterious substances, and be truthfully labeled."

That's about it.

Also, if this is the IBD group Petco now sells Bene-bac, probiotics in tubes. I
used some on my squirrels and cat after giving them antibiotics and it worked
great. Maybe the IBD cats could use some.

I think if you have the knowledge of nutrition, desire and money, a homemade
food would be preferable as it won't have additives, colorings, flavorings,
preservatives... My IBD cat couldn't eat store bought food. I had to make it
for him. I used the same ingredients in the can food, chicken and rice with
vitamin/mineral powder, but it didn't make him sick so it must have been
everything else in there.