Thursday 27 August 2009

The Diet Delusion



I cannot recommend reading the Diet Delusion by Gary Taubes any more highly. 500 pages of impeccable research and a thoughtful examination of current dietary thinking. A book so full of revelations that I almost got exhausted of being surprised by them. I had to restrain myself from reading bits to people on the tube on more than one occasion ... anyone who has been on the tube knows what a big no-no that is and anyone who knows me knows what a big no-no that is for me. In summary:

1. Dietary fat, whether saturated or not, is not the cause of obesity, heart disease, or any other chronic disease of civilisation.

2. The problem is carbohydrates in the diet, their effect on insulin secretion, and thus the hormonal regulation of homeostasis - the entire harmonic ensemble of the human body. The more easily digestible and refined the carbohydrates, the greater the effect on our height, weight and well-being.

3. Sugars - sucrose and high-fructose corn syrup specifically - are particularly harmful, probably because the combination of fructose and glucose simultaneously elevates insulin levels while overloading the liver with carbohydrates.

4. Through their direct effect on insulin and blood sugar, refined carbohydrates, starches and sugars are the dietary cause of coronary heart disease and diabetes. They are the most likely dietary causes of cancer, Alzheimer's disease, and the other chronic diseases of civilisation.

5. Obesity is a disorder of excess fat accumulation, not overeating, and not sedentary behaviour.

6. Consuming excess calories does not cause us to grow fatter, any more than it causes a child to grow taller. Expending more energy than we consume does not lead to long term weight loss; it leads to hunger.

7. Fattening and obesity are cause by an imbalance in the hormonal regulation of adipose tissue and fat metabolism. Fat synthesis and storage exceed mobilisation of fat from the adipose tissues and its subsequent oxidation. We become leaner when the hormonal regulation of the fat tissue reverse this balance.

8. Insulin is the primary regulator of fat storage. When insulin levels are elevated - either chronically (diabetes) or after a meal - we accumulate fat in our fat tissue. When insulin levels fall, we release fat from our fat tissue and use it for fuel.

9. By stimulating insulin secretion, carbohydrates make us fat and ultimately cause obesity. The fewer carbohydrates we consume, the leaner we will be.

10. By driving fat accumulation, carbohydrates also increase hunger and decrease the amount of energy we expend in metabolism and physical activity.

Is he right? Who knows, I'm no biochemistry expert. I think its enough that if he is even partially right it would be a complete revolution in the concept of diet and exercise. For me he has removed COMPLETELY any feelings of guilt surrounding food and my diet. Its difficult to express what that means to me; I was first put on a diet at 7 years old and thereafter the implication was that it was my conscious fault for being overweight and the only thing standing in my way was my lack of dedication and self control. Feeling like a failure for 21 years is grinding.

Compelling evidence to the contrary has revolutionised my life, my happiness and my entire attitude towards existence. Everyone should read this book and anyone who struggles with their weight should HAVE to read it, it is nothing less than extraordinary. I would love to disseminate Gary's ideas as far and wide as I'm able to. Unfortunately I'm no Oprah so I'm limited to publishing them on my blog. To get the full weight of his rationale and to appreciate the science behind it please read the book. Rant over.

In case you think on my own one of the jacket quotes is:

'This book is a most important contribution to Mankind - really an historic book.'
Jeremy Stone, president of The American Federation of Scientists.


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