Hi sixpence! Congrats on the lifestyle change and the loss so far!
As for wanting to speed up the loss, you've lost 6 lbs in about 6 weeks? That's not a bad rate of loss, actually, especially if you're not being too strict on your diet. You shouldn't be losing more than 1-2 lbs a week if you're going to do it healthily and maintain your weight loss. Remember, this is all about making changes you can keep up after you reach your goal. As for sugar, you may have cut out refined sugar by itself but are you paying attention to the amount of sugar in the food you are eating? There is a lot of hidden sugar in food... especially bread, fruit, yogurt, cereal...any of that. I'm not saying you should cut those foods out, but just keep track of them. FitDay is really good if you use it every day. I have to do a lot of customization but it's worth it. If you're only doing it every once in a while, though, it's not really going to help you out much.
As for the knee, I also have a knee problem that runs in my family... both my dad and little sister have had to have surgeries for it and I probably will eventually. So try to go for low-impact exercises. Swimming is awesome, or using an elliptical trainer, biking, or step aerobics are all relatively easy on your joints.
Measuring yourself is a good idea too, since you might be replacing fat with muscle, which weighs more but takes up less space.
Above all, don't get discouraged if what's on the scale isn't what you think it "should be". There is no norm for weight loss, everyone loses differently. The important thing is to keep making healthy choices and exercising and focusing on whether you feel better. The number on the scale should be secondary. You're losing weight! You're eating better! You're getting healthier, and that's awesome. Keep it up!!
