During the first phase, also called the Acute Weight Loss phase, you will eat primarily protein foods to get your body into ketosis. Calorie counts during this stage may be low. There are several media reports and reviews from patients stating that they were given daily goals in the 500-800 range. According to the company, those claims are not true:
I have helped numerous clients succeed in significant weight loss journeys that involve losses of over 20-30 kg in body fat over the space of 1-2 years or more. I actually find such longer term journeys more rewarding as they allow me to teach my clients about the impact of nutrition and lifestyle habits on their physiology. This not only helps them, but also helps those closest to them as well.