Pound of Muscle vs Pound of Fat
One pound of muscle and one pound of fat are NOT the same size.
If I place one pound of muscle on a scale and one pound of fat on a scale, they will both weigh one pound. The difference is in total volume. One pound of muscle may appear to be the size of baseball.
One pound of fat will be three times the size and look like a squiggly bowl of Jell-O.
See for yourself