James says that diets only work short term, which is why it's impossible to keep the weight off. It is possible to drop a dress size by existing on low-fat food and diet fizzy drinks, but the weight will inevitably pile back on because your body is full of toxins. Toxins are stored in your fat cells and can lead to such diseases as diabetes, heart disease, and cancer.
Toxins are the reason you get headachy and tired when you start to diet and they make it harder to lose weight when you diet. If you clean them out of your body, you will find it much easier to lose weight. On The Clean and Lean Diet you can drink coffee every day and even have a 'cheat meal' one day a week. Just follow the simple rules of the diet to keep the weight off.
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