I couldn't be any simpler with my nutrition recommendations for fat burning. You will get have the most energy and the best body and fitness level possible if you eat whole, natural foods. I always ask Dr. Chris Mohr, author of the Turbulence Training for Fat Loss Nutrition Guidelines if I ever need help with nutrition information.
You must avoid processed foods, which is pretty much anything in a bag or a box. So cut out muffins, donuts, pre-packaged cereals, white bread, pasta, chips, crackers, cookies, etc.
We need to return to a time of simpler eating, focusing on fruits, vegetables, nuts, lean proteins, and healthy fats. It will take some "bad habit breaking" to rid yourself of your addiction to processed foods, but in your journey you will learn to appreciate the taste of REAL food again.
You don't have to eat meat to lose fat and build muscle, but it's not unhealthy to eat beef, chicken, and fish. In fact, fish contains essential fatty acids we can't do without.
You might have heard about the importance of healthy fats, which is a big turn-around from the low-fat mentality of the 80's and 90's. We now know eating fish and nuts won't make us fat, but will in fact make us healthy and help control our appetite.
So just focus on foods that haven't been processed, and you'll start to see changes in your body and energy levels in a matter of days. Get rid of the processed foods and you won't be tired anymore!
I strongly believe nutrition is the MOST important factor in fat loss and in health. If you're eating processed foods, trans-fats, and too many calories, you won't get maximum benefits from your exercise program, no matter what you are doing. Nutrition can either heal you or kill you, so choose wisely. Fortunately, the right choices are the simple choices.
I've had clients that switched to whole, natural foods and almost overnight they've reported changes in their bodies and huge increases in mental energy. So stick with the simple nutrition approach for fat burning.