To make things worse, when you diet through deprivation, the increased ghrelin secretion sends even more signals to eat, overriding your willpower and causing chemical reactions that give you little choice but to line your tongue with bits of beef jerky.
Ghrelin also promotes eating by increasing the secretion of growth hormone (ghre is the Indo-European root word for growth). So when you increase ghrelin levels, you stimulate that growth hormone to kick in, and growth hormone builds you not only up, but out as well.
An interesting note: scientists found how ghrelin works accidentally: In gastric bypass surgery, doctors cut out the part of the stomach that secretes ghrelin. They soon realized that it wasn't just the smaller stomachs, but the reduced ghrelin production that helped surgery patients eat less food. The eat-everything signal was shut off, clearing the way for the satiety center to take care of its business.
Find out more about this book:YOU: On A Diet Revised Edition: The Owner's Manual for Waist Management