The advice about lifting less weight is a good one. You don't want to reach 'muscle failure' if you will. Lift a weight that you can lift about 8-12 reps, without feeling like you could not do any more sets because it was so heavy. OR that you can't come back tomorrow or the next day to the gym because it was so difficult.

The other thing I'd mention is to stay away from sugar..added sugar but also natural. Our body prefers sugar as fuel..so if we have it in our system, we burn sugar before fat. If we don't have sugar, our body turns to burning more fat.