While the diet and the ideas behind The FastDiet are pretty intriguing, the book doesn’t add a lot of value.
I was expecting something like Good Calories, Bad Calories. Something with a bit of research and data behind it. Instead you get a brief overview of the diet with a few pointers to studies, a few quotes from doctors at longevity institutes and then lots of advice for how to eat 500-600 calories on the fasting days. Not worth the $9.67 I paid for it.
I also checked out their website which has a brief overview of the diet, but no pointers to any studies.
The diet in summary:
- Eat normally 5 days a week.
- “Fast” on two non consecutive days. “Fasting” means eating 500-600 calories preferably in 2 meals spaced widely apart.
Their theory is two fold:
- Your body evolved under situations that required “fasting” and during those times it spent its energy on repairing itself. So fasting will cause your cells to regenerate, decreasing all sorts of bad things like high cholesterol, cancer and signs of aging.
- You’ll eat less, so you’ll lose weight. They quoted a study that said people eat more the day following a “fasting” day, but it was less than 125% more, not double what they would have eaten normally.
In addition to the proposed health benefits of the diet, they advocate that it’s much easier to follow than most other diets like low calorie or low carb. I do agree with them on that. I think it’s easier not to eat for two days a week than it is to count calories every day but they did not have any studies to support that.
Most of the evidence in the book was the authors’ own experiences, quotes from a few doctors at longevity institutes, pointers to a few studies and a bunch of letters with anecdotal evidence.
The diet is an interesting idea, but the book doesn’t do much more than explain the diet and the authors’ theories.