The second photo shows a lady who has 10 lbs of difference between the photo on the left and right. She weighs less in the photo on the left, but looks much more fit and in shape in the photo on the right.

The lady shown in the grocery store is holding a model representing 5 lbs of fat.

The last photo illustrates the difference between fat and muscle mass.

Helps put a few things in perspective.

Thanks for this. I'm pre op but this is pretty interesting

That's a good illustration Delta! I remember an instance a couple of years ago...... I had been working out at the gym really hard and gaining strength and muscle for a few months. Then I had an injury (completely torn bicep that required surgery to reattach it to the bone). Anyway, I was in a cast for about 6 weeks while it healed and I did absolutely zero physical activity for those 6 weeks. I mean I did nothing but sit around in the recliner that whole time watching tv and feeding my face eating like I'm getting ready for hibernation! When I had my cast taken off I weighed myself and I had lost 12 pounds since right before my surgery. I lost 12 pounds in a little over 6 weeks doing nothing but sitting around and eating and my clothes were a lot tighter at my belt. No one can tell me that I lost fat. In fact, what I lost was muscle and gained fat. I gain muscle fairly easily when working out, but I've also lost it quickly when I don't lift. That instance told me everything I always heard and kind of knew about the fat vs muscle density and weight issue.