Fast 800 starts with a rapid weight loss phase. You are advised to stay in stage 1 for a minimum of 2 weeks and no more than 12 weeks, and during this time you follow a daily 800-calorie eating plan. You do this by following a relatively low-carb Mediterranean-style diet, with lean protein sources and vegetables. On days when cooking is not possible, meal replacement shakes are available - these are high in protein, fibre and healthy fats. The plan recommends no more than two shakes per day or more than 10 per week, with the emphasis instead placed on whole, natural foods. Those adopting this stage of the plan typically have either a lot of weight to lose, require fast results, have reached a weight loss plateau or have type 2 diabetes. Stage 1 is designed to switch the body from burning sugar to fat burning by prompting mild ketosis.
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