What do you mean?

Do the gut bacteria have a tap into your brain and can they tell you what to eat and when? No.

Does your brain have pain sensors and a gauge to determine how full you are and can THOSE things being influenced by things your gut bacteria does? Sure.

If you eat something that doesn't agree with you and you get indigestion, you're usually not hungry for more food while you're dealing with that issue, and when you don't eat your stomach acid starts eating your stomach instead of your food and the pain let's you know it's time for more food.

You gut bacteria are part of the system, but they don't really control anything, they just kind of do their thing and the body reacts around them.