I've been doing fitness coaching/training professionally for since 2001 and in my experience, while my workouts are tough, getting the diet right is the toughest part.
The diet tends to make or break someone's fat burning, weight loss and fitness goals. Here are two tips that will jump start your diet and get you on track to accomplishing your fat burning, weight loss and fitness goals.
Simple tip number one is to add a vegetable/vegetables or berries to every meal. Both vegetables and berries are highly nutritious and they tend to be low in calories. By adding vegetables or berries to every meal you will make that meal more filling and nutritious. Making your meals filling and nutritious is highly important if you want to succeed in fat burning, weight loss and fitness long term.
Simple tip number two is to include a protein source in every meal. Protein is what is going to help repair, build and maintain muscle. Muscle is very important in keeping your metabolism boosted. A boosted/fast metabolism will help you burn fat and lose weight short and long term.
If you're just starting out, don't try to get too complicated with your diet. Start with these two easy tips and adjust your diet from there as necessary. Good luck!