Congratulations on your weight loss. That's a great accomplishment! Let me take this a little out of order. Whenever someone mentions they're at a plateau I always recommend they weigh and measure everything they eat and drink for a week. That's the best way to check accuracy. It's very, very easy to underestimate portion sizes and, especially, when someone's been at it for a while it's easy to have a few extra calories here, a few extra there sneak in -- and the next thing there's no weight loss.
Keep in mind that the closer you get to goal weight the slower the loss will be. That's the body's way of protecting itself an making sure there's some stored energy (body fat) around for an emergency.
The other thing is to increase the intensity of your activity. Make it harder, not longer. That will help burn more calories and may jumpstart you again
Yes, your BMI of 24 - now considered in the "normal" range - is why you got the next phase. That all comes through the Personal Calculator (based on the info provided at the start of the Program) that changes calorie and fat levels, etc.
You've done a terrific job so Keep on keepin' on! And keep coming back to the board. We're all here to help you!
Pat Baird, MA, RD, registered dietitian