However, new research suggests another answer may be a hormone called glucagon-like peptide 1 (GLP-1).
But glucose can't enter our cells without insulin, which is a hormone produced by the pancreas.
It shuts off the neurotransmitters in response to leptin, a hormone released by fat cells.
Each of our brains are guided by a hormone called oxytocin in matters of trust.
Doctors have been using a hormone called interferon in combination with anti-viral drugs for several years.
Aromatase inhibitors, like Arimidex, stop estrogen production completely by curtailing a hormone called aromatase.
"I'm just amazed how many men start a hormone without doing research, " he says.
The primary treatment for prostate cancer is a hormone treatment which causes osteoporosis.
Insulin is a hormone made in cells in the pancreas that controls how the body uses sugar.
Having removed their pituitaries, he then infused the lambs with cortisol, a hormone indirectly produced by that gland.
PT141 is a copy of a hormone which has an effect on the nervous system called alpha-melanocyte-stimulating hormone.
They work by inhibiting prostaglandin, a hormone-like substance that plays a part in signalling pain to the brain.
HCG, human chorionic gonadotropin, is a hormone produced by the placenta during pregnancy.
Their diabetes is caused by a failure of the pancreas to produce sufficient insulin, a hormone needed to process sugar.
In the late 1970s Harvard Medical School researcher Joel Habener serendipitously discovered a hormone in monkfish called GLP-1 (glucagon-like peptide).
They picked a hormone called glucagon-like peptide-1 (GLP-1) that is made by intestinal cells in response to sugar and fat.
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Melatonin is a hormone produced in a gland in the brain, and helps maintain the natural cycle of sleep and wake.
The hypothalamus reacts to ghrelin, a hormone excreted by an empty stomach, by releasing appetite-stimulating neurotransmitters into other parts of the brain.
Sheller explains that Risperdal stimulated the production of prolacting, which is a hormone released by the pituitary gland that stimulates breast development.
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Dr. WADLER: In either case, you're injecting a hormone into your muscles.
Their levels of a hormone called interferon-tau were far lower than normal.
Throughout the 1990s, many urologists had supplemented their revenues through an arrangement with the maker of Lupron, a hormone drug for prostate cancer.
Melatonin is a hormone found in the body that is also available in synthetic form as a supplement that may help stimulate sleep.
In the maternal samples, they measured testosterone, a hormone, and cotinine, a breakdown product of nicotine that shows a person's level of smoking.
The body's response to prolonged periods of stress is to secrete increasing amounts of cortisol, a hormone that marshals resources to cope with crises.
They measured levels of cortisol, a hormone that's produced when we are stressed, in a wide range of healthy people in the morning and evening.
The scientists, from Johns Hopkins University in Baltimore, US, believe that their chemical, called C75, stops the production of a hormone that makes the mice hungry.
Scientists have long known that a hormone called neuropeptide Y is a major appetite regulator - if animals fast, the amount of NPY increases and stimulates appetite.
Sometimes it is a normal gene that directs the production of a hormone, such as insulin, or of the cell machinery which that hormone stimulates, such as the insulin receptor.
He claimed that a male partner in the delivery room can make a woman more anxious, slowing the production of oxytocin, a hormone which helps the labour process.
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