Hunger Bar not re-filling after eating

Sometimes when I attempt to eat something usually Baked Potatoes or Golden Carrets Minecraft will play the animation of me eating and the sound as if I am eating and my hunger bar will go up for about half a second but then... It just goes back down and I receive back my food! Very annoying.

P.S. Mojang or Microsoft pleaseeeee add Borderless Windowed. It would help everybody so much.