Yes, there are over 100 studies that show people lose 50% more weight with alli than just diet alone. Generally this averages a period of six month when most of the weight is lost. However, in the initial period many people lost more than that per week and then it tapers off to 1 to 2.
In addition, alli is a Program - as you know - that includes more than diet. It also includes physical activity, journaling, learning fat and calorie amounts in food, engaging in regular activity, and making lifestyle changes over a period of time that will help them MAINTAIN the loss once goal weight is reached.
Few other programs offer the comprehensive approach of alli, and while other low-fat diets do help people to lose weight these diets are often abandoned because of boredom, lack of support, etc.
Everyone loses weight at a different rate for a variety of factors: age, starting weight, hormone levels, metabolic rate, muscle mass, etc. etc. Your loss of 21 pounds in three months is excellent. In addition, you've gotten into a good exercise routine -- which I'm sure has you feeling a lot better emotionally and physically.
I generally defer to the recommendations of the Personal Calculator. That's because the calories are determined by all the personal information that's entered in the beginning; and each week for the check-in. It changes calorie and fat levels when appropriate.
I suggest you weigh and measure everything you eat and drink for at least a week. It's a great way to see if your counts are accurate. It's very, very easy to underestimate portion sizes and so a few calories here, a few calories there might be 200 more calories that realized. In addition, this is a valuable lesson in learning to judge how much to have when eating out!
Though you're exercising 5 days per week you may need to raise the level of intensity of your workouts. You're burning less calories because you're moving around 21 fewer calories, AND because the body adjusts to the same amount of exercise. It's helpful to change the types and amounts of exercise you do from time to time.
I hope this helps. Please let me know if you need anything else.
Pat Baird, MA, RD, registered dietitian