No, he shouldnt keep the juices.

Juice is full of sugar (fructose), eat fruit. You get all the vitamins without as much sugar and preservatives.

Good luck man, but (Im an amature bodybuilder studying to be a personal trainer) you should lift as well as doing cardio to lose fat.
Lifting ups your metabolism (the rate at which you burn calories) for up to 48 hours after you lift. Its only a few hours after cardio.

And stick to highers reps, do say 3 sets of 12 reps for each lift. And dont do cardio and weights on same day. Oh! and the best diet ever is high protein! and cut out the high GI carbs.

Good luck man! If you have any questions I could answer for you feel free