How can air in food make you more satisfied – make you eat less?  How can it curb a tendency to be fat, or reverse a trend?   Can it?  Turns out – yes.   Feed a hungry college student a half glass full of smoothie and they will eat 20% more at lunch ½ later than the college student who drinks the SAME smoothie only whipped until it swells to a full glass with air.  Not only that, but the ones that eat the airy smoothie don’t make it up at their next meal.    My brother, John, and …