I think its great what you are doing. Your backhand looks good. How about picking up the ball a little earlier on forehand with racket head down a bit more?
As for the food, when I was home for Thanksgiving in USA, I could see how deadly all the convenience foods are...Only eat natural and unprocessed things for your snacks- that's definitely the way to go. How about some light running and footwork drills? I found that running (and by no means long distances) really helped me speed up my game and return the unreturnable shots...I play 4.0 (female 5'4" 115 pounds) and am hoping to move up a grade after recovering from shoulder injury...