A good analogy of how the brain needs stimulation is when you take a cast off six weeks after breaking your arm. When you initially take the cast off, the first thing you notice is how small your forearm is compared to the normal arm. It's significantly smaller because you haven't used it in six weeks and the muscles atrophied.
Same thing for the brain! Even after you've reduced inflammation and addressed the root cause for the gut issue, a lot of times the brain still needs the stimulation and rehab in order to help the gut function optimally again. This happens through neuroplasticity. This just means the ability of the brain to remodel and change. With stimulation, the neurons replicate protein, form new branches of the existing neurons and make the communication more efficient. If the brain is changing and improving, then there is likely more input from the brain to the gut and then the gut is able to provide more input back into the brain. Over time, the goal is to improve this feedback loop and communication to make both the gut and brain function better.
You commonly hear the line 'You only use 10% of your brain' in movies or in just a normal conversation. This is referring to everything we are consciously aware of. For example, if you have a thought, brainstorm, throw a ball, go for a bike ride or paint a picture, these are all things you're consciously aware of. What about the other 90%?
The remaining 90% is everything that is subconscious. This information goes from your brain down to your brainstem to regulate vital and autonomic functions
Is my heart beating?
Am I digesting food?
Am I breathing?
If I take something in that's toxic, will I throw it up?
You don't have to think about these things because they are automatic functions regulated by your brain and autonomic nervous system.
So, the healthier the brain, the more feedback you can send into the gut. This will hopefully result in improved gut function. From here, the gut will then increase input back to the brain and the cycle repeats itself.