[charrr]

Well, I don't know about the banana's actual role in this. Sometimes specific combinations of foods encourage certain outcomes. Some people consider dairy/creams as having to do with weight gain/ balance anyway. I read studies that people who eat yogurt might tend to have a healthier weight, but sometimes the questionable substances (growth hormone?) in some dairy products may also contribute to hormonal changes in the body that affect people's hormones. Maybe if you like "cream" and can eat it healthfully, you might have a glass with a banana or some similar alternative that matches the banana shake idea.
Good luck, dear!