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Sadly it answered in a sensible and boring way.

Directly injecting veggie fiber into your colon is not safe and can cause serious harm. The colon is sensitive, and introducing substances directly into it without proper medical guidance can lead to infections, injuries, or other complications. It’s essential to consume fiber through a proper diet or approved supplements. If you’re experiencing digestive issues or concerns about fiber intake, it’s best to consult a healthcare professional for safe and effective solutions.