Feeling slumpy? Go to the grocery store and find one or more items that represent how much weight you have lost so far. Then walk around for about five minutes holding that to get an idea of what your body once held.
Only lost five or ten pounds? Go grab a bag or two of sugar.
Lost 20 lbs? Grab a bag of dog food.
Lost 35 lbs? Grab one of those giant tubs of cat litter and try walking around with it. Yeah, it's likely you don't think you look that different - but all of that was once supported by your body. Yikes!