How much does the amount of food in a meal decrease when using Maunja?

This is the part I was most curious about while researching Maunzaro.

Looking at the reviews, some people say their food intake has decreased significantly.
Some people said they ended up eating a little less than usual, so it seems like the difference is quite significant.

I have a habit of eating until I'm completely full once I start, so
I'm a little curious about the part where you can naturally control your food intake.

I think forcing yourself to hold back feels completely different from naturally eating less because you aren't that hungry.

I would appreciate it if those who have actually used it could let me know how their meal portions have changed.