The hormones leptin and ghrelin act in a kind of yin-yang relationship when it comes to hunger and satisfaction. Just as leptin tells the brain to turn off hunger, ghrelin tells the brain you're famished.
For the average person, ghrelin levels increase when the stomach is empty. Ghrelin is the reason you always feel hungry at particular times in the day — your body's clock triggers the release of the hormone according to a finely tuned schedule. Ghrelin will remain elevated until you've given your body enough nutrients to satisfy its needs. Because the hormonal signals that you're satisfied can take time to kick in, eating slowly may help you eat less overall. By the time your stomach fills up, ghrelin levels start to drop again, you feel satisfied, and you stop eating. Sounds easy, right? Well, as usual, there's more involved that complicates the story.
|Jillian on Everyday Health|
Staying On Track During Vacation
Q: "I've been really good about my workouts and eating right, but I'm about to go on vacation with my family. I want to have fun and not be too strict, but I don't want to fall off the wagon completely! What do you suggest?"
See Jillian's answer on Everyday Health