I have to second much of what's been said here.
Some of the most common mistakes when aiming to lose fat raw are:
1. Eating too many trouble fats and too few useful ones. Some fats are particularly troublesome such as those in nuts, whereas there is a great deal of research on coconut suggesting that it's fats may actually *help* us lose weight (look for our interview with Dr Bruce Fife ND soon for more info on this). Similarly research on fresh, non rancid omega 3's (such as in flax sed, chia seed and greens like purslane) are more easily useable by the body and so can be of use.
2. Exercising to little or not at all.
3. Focusing on losing weight rather than fat. Muscle weighs 3 times what fat does. Lose 30cm cubed of muscle and put on 60cm cubed of fat and you've lost weight. You'll look flabbier, fatter and have less energy though. Most body builders weigh in like a truck, but are lean. As you focus, so shall you recieve.
4. Expecting it to be a sprint rather than a marathon. Statistically, the weight you take off slowly you're likely to keep off. The weight you "dump" usually comes back when your bodies survival mechanisms kick in, so celebrate that you're losing it slow and regular - thats awesome!

5. Not having enough fun. Anything you enjoy you'll keep doing and getting results from. For most people using "discipline" is anything but fun, ergo no results and the often heard moan "if only I had MORE discipline!..." I'd hazzard a guess in many of these cases that people saying this would do better if only they had a bit LESS discipline... and more creativity with finding ways of making their change fun!
Hope this helps!
Cheers
Piers