One thing is for sure. Whenever I'm well fed (solid protein intake), and I drink a raw OJ or orange & mango juice shortly after or in-between meals, it makes me feel amazing, so satisfying to my brain. If only if it weren't so expensive.
If drink it when I'm too hungry
Store-bought juice gives me gas and minor indigestion.
Probably the fructose helps to assimilate the glucose from starch.