No I havent read the 17 day diet book but I will safely assume that the reviews people posted on the diet outlines the basic process.

Cycle 1, called "Accelerate," strips your diet down to the bare bones of approximately 1,200 calories per day. It promises weight loss of 10-15 pounds, most of which is water weight.

“This phase cleanses, hydrates, removes unhealthy carbs, improves unhealthy eating habits, and stimulates fat metabolism," Moreno says.

In cycle 2 (called "Activate,") the food plan is alternated with a slightly higher-calorie activate plan. Moreno says the zig-zag between cycles keeps the metabolism guessing, helps prevent boredom, and continues to stimulate fat burning to yield about a 5-6 pound weight loss.

Cycle 3, called "Achieve," is the stabilization period that allows healthier foods with a slower rate of weight loss of about 2-3 pounds, Moreno says.

Cycle 4 -- the final phase, called "Arrive" -- is when you arrive at your goal weight. In cycle 4, follow meal plans from one of the earlier cycles during the week with controlled splurges on weekends to maintain your new weight.

Exercise at least 17 minutes a day during the first two cycles – primarily walking because of the limited calorie intake. In the later cycles, ramp up exercise to 150-300 minutes per week for continued weight loss.
Source: http://www.webmd.com/diet/features/17-day-diet-review

Cutting your calories down to 1200 a day will put your metabolism into starvation mode. Meaning it will slow it down. Once your metabolism is in this mode your body will do its best not to burn a lot of energy.

On the second cycle you will be adding more calories to a slow metabolism. This will not simply move your metabolism out of starvation mode and metabolism shocking or confusion is not a proved hypothosis.

http://youtu.be/kfzX14YfimU