They don't in my system. Kathy Smith is not the recipient of my J Pouch and has no right to tell you what does and doesn't break down in my J Pouch. All she lives for is objecting to anything I print here. You might have better luck with lettuce than I have, but for me I have to consider it a failure.quote:Contrary to what Dog Day says, lettuce (and other foods) actually do break down.