I red about something like that, in the past, that was saying that eating slowly had benefits on the quantity of food we eat. I know it's something up about the mechano-receptor in the stomach, that sense the tension of the organ when we have food intake : it sends some signal to the brain saying ''need more food (still hungry)'' vs '' stomach full enough (stop eating!)''. it was something with the time that the signals take to go to the brain...
Like if we eat too fast, we'll still feel hungry cause the brain didnt received the signal yet, even is the stomach had a big enough food intake.
So scientifically, it all make senses.... I don't know if it can result in a significative weight loss, but it sure can't harmful
