From the Makeover Specialist:

It is very important that you eat prior to working out for 2 basic reasons:

1.  Your body needs the food to supply energy for your workout. You are at greater risk of injuring yourself and having to quit early due to lack of energy.

2. If you do not eat prior to working out, your body will burn muscle to sustain you during your workout. You want to build and tone muscle, not burn muscle.

3.  Morning workout:  Eating when you first wake up wakes up your metabolism and gets it functioning efficiently throughout the day.

4.  Do not remove any food from the pre-workout meal. Add carb/fruit. If you are working out twice in one day (i.e. cardio in morning and bands in evening) you must adjust both pre-workout meals accordingly.

5.  After dinner work-out: eat your PM mini-meal (snack).