ghrelin is thought to increase feelings of hunger.    From Wordnet, Princeton University. 

"This part of the stomach is in charge of producing a hormone called ghrelin, which is responsible for our appetite," said Gandsas.    From Wordnik.com. Reference

When our bodies notice we need more calories, levels of a hormone called ghrelin increase.    From Wordnik.com.  [I’m so hungry I could kiss you | clusterflock] Reference

The body responds by releasing a hormone called ghrelin, which causes hunger and provokes us to eat even more.    From Wordnik.com.  [Clipmarks | Live Clips] Reference

While leptin curbs hunger, the gremlin called ghrelin can make a child hungry.    From Wordnik.com.  [You Raising Your Child] Reference

It also seems to help lower levels of the hormone ghrelin, which is known to stimulate appetite.    From Wordnik.com.  [Lead Stories from AOL] Reference

If you are lacking sleep, the hormone that increases your appetite -- called ghrelin -- increases.    From Wordnik.com.  [Susan B. Dopart, M.S., R.D.: Are Your Weight Issues Tied to Insulin Resistance?] Reference

In 1999 Japanese scientists discovered the "ghrelin" hormone.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

You're consuming something that tastes sweet and this tells your body to expect some calories on the way Wiki "ghrelin".    From Wordnik.com.  [WTF, Seriously.] Reference

When your stomach’s empty, they release a feisty little chemical called ghrelin.    From Wordnik.com.  [You: On a Diet] Reference

"It may also work by decreasing the production of the hormone ghrelin, which is secreted from the stomach to stimulate appetite.    From Wordnik.com.  [Medlogs - Recent stories] Reference

One is a gremlin called ghrelin.    From Wordnik.com.  [You Raising Your Child] Reference

A GHRH releasing agent such as ghrelin (or ghrelin mimetics) might trigger synchronisation between GHRH neurons.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

Mice who had limited ghrelin activity seemed depressed.    From Wordnik.com.  [Hunger Can Make You Happy « Isegoria] Reference

Those that were not given ghrelin showed no preference.    From Wordnik.com.  [Blame your brain for overeating] Reference

But, amazingly, it is coded by the same gene as ghrelin.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

An imbalance in leptin and ghrelin, which can lead to obesity.    From Wordnik.com.  [Connie Bennett: Is Sleep Deprivation Making You Suicidal?] Reference

You have more ghrelin in your body and that leads to more hunger.    From Wordnik.com.  [CNN Transcript Dec 7, 2004] Reference

One way of finding the answer is by making ghrelin-knockout mice.    From Wordnik.com.  [Analog Science Fiction and Fact]

The fault lies in our ghrelin, not ourselves, that we are gluttons.    From Wordnik.com.  [Blame your brain for overeating] Reference

Tschöp says these human studies support the new model for ghrelin.    From Wordnik.com.  [Fire Up Your Hunger Hormone | Impact Lab] Reference

Levels of ghrelin were elevated in response to the 1-meal-per-day regimen.    From Wordnik.com.  [Intermittent fasting guest blog | The Blog of Michael R. Eades, M.D.] Reference

Two potential targets are ghrelin, an appetite stimulant, and PYY, a suppressant.    From Wordnik.com.  [Analog Science Fiction and Fact]

Drug companies are scrambling to find a drug that will inhibit ghrelin production.    From Wordnik.com.  [Analog Science Fiction and Fact]

The animals that received ghrelin did so far longer than their non-ghrelinated cousins.    From Wordnik.com.  [Blame your brain for overeating] Reference

The researchers checked blood for glucose, insulin, leptin and ghrelin on this first day.    From Wordnik.com.  [High-fructose corn syrup follies | The Blog of Michael R. Eades, M.D.] Reference

They found that when they gave the mice ghrelin, they strongly preferred the high-fat room.    From Wordnik.com.  [Blame your brain for overeating] Reference

Blocking the action of ghrelin reduced the amount of time the mice spent in the high-fat room.    From Wordnik.com.  [Blame your brain for overeating] Reference

When you don't sleep enough, when you get less sleep, you get more of a hormone called ghrelin.    From Wordnik.com.  [CNN Transcript Dec 7, 2004] Reference

New findings show that appetite-regulating peptides leptin and ghrelin influence alcohol craving.    From Wordnik.com.  [Speedlinking 5/31/07] Reference

Lack of sleep affects the balance of hormones ghrelin and leptin in the body that affect appetite.    From Wordnik.com.  [Janice Taylor: 15 Tips for Better Sleep] Reference

"At the bottom of this tube is a little tiny fleck of stuff, which is pure dried ghrelin," he says.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

In contrast, mice with high levels of ghrelin swam energetically in deep water, looking for escape.    From Wordnik.com.  [Hunger Can Make You Happy « Isegoria] Reference

They were able to track the hormone back to a gene, and then they produced a mouse without the ghrelin gene.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

I know that it takes ghrelin to signal the brain about 20 to 30 minutes before we are satisfied with food eaten.    From Wordnik.com.  [High-fructose corn syrup fights back | The Blog of Michael R. Eades, M.D.] Reference

It is thought that an oral medication could be developed to either inhibit ghrelin or boost obestatin or do both.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

And -- and in an -- in an obese person, or a person who is dieting, the amount of ghrelin increases in their stomach.    From Wordnik.com.  [CNN Transcript Jan 12, 2007] Reference

So when they knocked out the gene for the hunger hormone ghrelin, they were also knocking out the fullness hormone obestatin.    From Wordnik.com.  [The Speculist: November 2005 Archives] Reference

Fasting levels of insulin, leptin, ghrelin, adiponectin, resistin, and BDNF were not significantly affected by meal frequency.    From Wordnik.com.  [Intermittent fasting guest blog | The Blog of Michael R. Eades, M.D.] Reference