Exercise and Weight Loss

Why does exercise cause you to lose weight? Everything that I have read up to this point has based it either on the the calories burned, the metabolism-raising effect of weight-lifting, or the HGH release of HIIT and its afterburn effect. However, today I came across this:

“…a study published in July by Paul MacLean and his colleagues at the University of Colorado at Denver revealed new insight into exercise and weight loss: Physical activity reduces weight by increasing the brain’s sensitivity to appetite-suppressing hormones like leptin and insulin more so than by burning calories. According to MacLean, it may make the brain ‘more receptive to what the leptin and insulin are trying to say.’”

 Source

Interesting.