Although there are exceptions, the grand majority of diets out there are fairly simple one-size-fits-all approaches, something I mentioned briefly above. Yes, there may be some slight individualization (usually in terms of protein intake or calories but sometimes not even that) but for the most part, diet book authors tend to take a one diet for all people approach. The majority of mainstream nutritionists and RDs take the same attitude. To say that I find this approach absurd is an understatement.
Although humans share the same general physiology, there are always subtle differences. Any physician knows that the drug that will work optimally for one person may not work as well for another, even if they suffer from the same disease. This is why there are different drug options for different diseases.
You find the same thing in exercise programs. While there are certainly general principles that apply to just about everyone, there is most also certainly variance in what people respond to. It's not as simple as saying 'Do this and ye shall succeed' or a lot more people would be succeeding. Some individualization is always needed.
Of course, this makes it very difficult to write a diet book since people tend to like having simple answers handed to them on a platter. It's a big part of why I haven't written the diet book I want to write yet, trying to factor in all the considerations I make in setting up a diet for someone and putting it into a coherent book form has been too much of a hassle to this point. The next to last chapter of both The Rapid Fat Loss Handbook and this book is my rough attempt to put some of my thoughts on the topic down, one of these days I'll get off my lazy butt and put them all down in one monster diet book.
Anyhow, for some reason, both diet book authors and RD's are too arrogant (or too stupid) to realize that the same principle applies to diets: there can't be any single approach that works for all people or all situations equally well. Of course, it takes less thought on the part of the person giving the diet advice (and makes writing diet books much easier). This type of approach also appeals more to the American public. They want to be given THE ANSWER (TM) and not have to think too much about it beyond that.
Of course, when you consider the miserable results statistics of those same groups (slim and none with obesity getting worse not better), you start to realize that it's not working. And I have a rather simple rule: if something isn't working, you change it.
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I can't believe I'm actually writing the book that is going to help you achieve the level of health and fitness that you always dreamed of. Me, little scrawny sickly Darlene that was always last picked in gym class. There's power in a good story here so get this book now.