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Low Doses of Growth Hormone May Trigger Weight Loss

Feb. 13, 2004 -- It may sound contradictory, but a dose of growth hormone could be just what obese people need to help them shed pounds and become smaller.

A new study shows that obese people have lower-than-normal levels of growth hormone in their body, which may make it harder for them to lose weight.

Researchers found that low doses of growth hormone helped men and women lose fat while keeping muscle. It also helped them keep it off for up to nine months.

Growth Hormone Prompts Weight Loss

Researchers say the goal of weight loss is to lose the fat but keep the muscle, but so far no drugs have been able to help people achieve that feat.

The study, published in the current issue of The Journal of Clinical Endocrinology and Metabolism, looked at the effects of giving obese people low doses of growth hormone in an attempt to help them selectively lose fat while retaining lean muscle tissue.

Researchers say previous studies on growth hormone and weight loss have used relatively high doses, which resulted in unwanted side effects, such as swelling, hypertension, joint pains, and glucose intolerance (a risk factor for diabetes).

The study consisted of 59 obese men and women, whose average BMI was 37 (BMI is a measure of weight for height). The participants gave themselves nighttime injections containing 200 µg of growth hormone or a placebo for one month. For the next five months, the dosage of growth hormone was increased to 400 µg per day in men and 600 µg in women. Researchers say the increase was necessary because prior studies show resistance to the drug can develop over time, especially among women. Both groups were prescribed a diet and were instructed on lifestyle modification and exercise.

Among the 39 people who completed the 6-month treatment and follow up, the study showed that those who used growth hormone lost an average of about 5 pounds and kept it off for up to nine months. Researchers say the weight loss was entirely caused by a loss of body fat.

In contrast, those on the placebo lost an average of only a little more than an ounce in total body weight and less than a pound in body fat. The loss of body fat was predominantly in the trunk and not the hips or extremities. This type of central fat distribution is associated with cardiovascular disease.

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