Will I have to keep the low calorie diet for the rest of my life?

No, you stop with low calorie diet 3 days after your last hcg injetion. However you have to watch your diet for additional 3 weeks after the last hcg injection. During this time you are prone to regain the weight. Sugar and starch are prohibited and total calorie intake should be between 1500 and 2000 calories.