The "gut-brain axis" is mostly bullshit invented to cope with the fact that doctors have sent patients to shrinks for decades with real sicknesses. Everybody knows you feel bad when your digestive is out of balance. It's the same english word for "I'm sick" and "I feel sick" since forever. No magical newly found "gut-brain axis" needed.

Eating junk food, especially sweetened food is a drug. You can do a withdrawal and get the reduction of food noise reported with semaglutide without getting dependent on another drug with so far unknown long-term effects.