With any diet plan, there are pros and cons. One of the pros is the obvious, weight loss. You can lose anywhere between 3-5 lbs a week (that's 50 lbs in 3 months). Also, there have been studies that indicate that low calorie diets reduce the chance of breast cancer. Now that's a plus if I've ever seen one! Some side effects that could occur are diarrhea, nausea and constipation. These side effects tend to disappear over time as your body adjusts to your new diet plan.