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Hormones are chemical messengers that control and coordinate the functions of all tissues and organs. Each hormone is secreted from a particular gland and distributed throughout the body to act on tissues at different sites. Two areas of the brain, the hypothalamus and the pituitary, release hormones, as do glands in other parts of the body, such as the thyroid, adrenal glands, gonads, pancreas, and parathyroid. For hormones to function properly, their amount and the timing of their release must be finely coordinated, and the target tissues must be able to respond to them accurately. Alcohol can impair the functions of the hormone-releasing glands and of the target tissues, thereby causing serious medical consequences.
Hormones control four major areas of body function: production, utilization, and storage of energy; reproduction; maintenance of the internal environment (e.g., blood pressure and bone mass); and growth and development. This Alcohol Alert describes how, by interfering with hormone actions, alcohol can alter blood sugar levels and exacerbate or cause diabetes (1-4); impair reproductive functions (5,6); and interfere with calcium metabolism and bone structure, increasing the risk of osteoporosis (7). Conversely, hormones also may affect alcohol consumption by influencing alcohol-seeking behavior.
The sugar glucose is the main energy source for all tissues. Glucose is derived from three sources: from food; from synthesis (manufacture) in the body; and from the breakdown of glycogen, a form of glucose that the body stores in the liver. Hormones help to maintain a constant concentration of glucose in the blood. This is especially important for the brain because it cannot make or store glucose but depends on glucose supplied by the blood. Even brief periods of low glucose levels (hypoglycemia) can cause brain damage.
Two hormones that are secreted by the pancreas and that regulate blood glucose levels are insulin and glucagon. Insulin lowers the glucose concentration in the blood; glucagon raises it. Because prevention of hypoglycemia is vital for the body, several hormones from the adrenal glands and pituitary back up glucagon function.
Alcohol consumption interferes with all three glucose sources and with the actions
of the regulatory hormones. Chronic heavy drinkers often have insufficient dietary intake of glucose (8). Without eating, glycogen stores are exhausted in a few hours (1). In addition, the body's glucose production is inhibited while alcohol is being metabolized (2). The combination of these effects can cause severe hypoglycemia 6 to 36 hours after a binge- drinking episode (1).
Even in well-nourished people, alcohol can disturb blood sugar levels. Acute alcohol consumption, especially in combination with sugar, augments insulin secretion and causes temporary hypoglycemia (9). In addition, studies in healthy subjects (10) and insulin-dependent diabetics (3) have shown that acute alcohol consumption can impair the hormonal response to hypoglycemia.
Chronic heavy drinking, in contrast, has been associated with excessive blood glucose levels (hyperglycemia). Chronic alcohol abuse can reduce the body's responsiveness to insulin and cause glucose intolerance in both healthy individuals (11) and alcoholics with liver cirrhosis (12). In fact, 45 to 70 percent of patients with alcoholic liver disease are glucose intolerant or are frankly diabetic (1). In animals, chronic alcohol administration also increases secretion of glucagon and other hormones that raise blood g lucose levels (13).
Alcohol consumption can be especially harmful in people with a predisposition to hypoglycemia, such as patients who are being treated for diabetes (3,4). Alcohol can interfere with the management of diabetes in different ways. Acute as well as chronic alcohol consumption can alter the effectiveness of hypoglycemic medications (14,15). Treatment of diabetes by tight control of blood glucose levels is difficult in alcoholics, and both hypoglycemic and hyperglycemic episodes are common (4). In a Japanese study, alcoholics with diabetes had a significantly lower survival rate than other alcoholics (16).
The human reproductive system is regulated by many hormones. The most important are androgens (e.g., testosterone) and estrogens (e.g., estradiol). They are synthesized mainly by the testes and the ovaries and affect reproductive functions in various target tissues. Other reproductive hormones are synthesized in the hypothalamus and pituitary. Although men and women produce many of the same hormones, their relative concentrations and their functions vary.
In men, reproductive hormones are responsible for sexual maturation, sperm development and thus fertility, and various aspects of male sexual behavior. In women, hormones promote the development of secondary sexual characteristics, such as breast development and distribution of body hair; regulate the menstrual cycle; and are necessary to maintain pregnancy. Chronic heavy drinking can interfere with all these functions. Its most severe consequences in both men and women include inadequate functioning of the testes and ovaries, resulting in hormonal deficiencies, sexual dysfunction, and infertility (5,6).
Alcohol is directly toxic to the testes, causing reduced testosterone levels in men. In a study of normal healthy men who received alcohol for 4 weeks, testosterone levels declined after only 5 days and continued to fall throughout the study period (17). Prolonged testosterone deficiency may contribute to a "femininization" of male sexual characteristics, for example breast enlargement (18).
In addition, animal studies have shown that acute alcohol administration affects the release of hormones from the hypothalamus and pituitary (5). Even without a detectable reduction of testosterone levels, changes in these hormones can contribute to the impairment of male sexual and reproductive functions (19). Alcohol also may interfere with normal sperm structure and movement by inhibiting the metabolism of vitamin A (20), which is essential for sperm development.
In premenopausal women, chronic heavy drinking can contribute to a multitude of reproductive disorders. These include cessation of menstruation, irregular menstrual cycles, menstrual cycles without ovulation, early menopause, and increased risk of spontaneous abortions (6,21,22). These dysfunctions can be caused by alcohol's interfering directly with the hormonal regulation of the reproductive system or indirectly through other disorders associated with alcohol abuse, such as liver disease, pancreatic disease, malnutrition, or fetal abnormalities (6).
Although most of these reproductive problems were found in alcoholic women, some also were observed in women classified as social drinkers, who drank about three drinks per day during a 3-week study (23). A significant number of these women had abnormal menstrual cycles and a delay or lack of ovulation.
Alcohol also affects reproductive hormones in postmenopausal women. After menopause, estradiol levels decline drastically because the hormone is no longer synthesized in the ovaries, and only small amounts are derived from the conversion of testosterone in other tissues. This estradiol deficiency has been associated with an increased risk for cardiovascular disease and osteoporosis in po stmenopausal women (24). Alcohol can increase the conversion of testosterone into estradiol (25). Accordingly, postmenopausal women who drank (24,26) were found to have higher estradiol levels than abstaining women. Studies have shown that in postmenopausal women, three to six drinks per week may reduce the risk of cardiovascular disease (27) without significantly impairing bone quality (24) or increasing the risk of alcoholic liver disease (28) or breast cancer (29).
Calcium exists in two forms in the body. The main reservoirs are the bones and teeth, where the calcium content determines the strength and the stiffness of the bones. The rest of the body's calcium is dissolved in the body fluids. Calcium is important for many body functions, including communication between and within cells. The overall calcium levels depend on how much calcium is in the diet, how much is absorbed into the body, and how much is excreted. Calcium absorption, excretion, and distribution between bones and body fluids are regulated by several hormones, namely parathyroid hormone (PTH); vitamin D-derived hormones; and calcitonin, which is made by specific cells in the thyroid.
Alcohol can interfere with calcium and bone metabolism in several ways. Acute alcohol consumption can lead to a transient PTH deficiency and increased urinary calcium excretion, resulting in loss of calcium from the body (30). Chronic heavy drinking can disturb vitamin D metabolism, resulting in inadequate absorption of dietary calcium (31).
Studies in alcoholics also have shown that alcohol is directly toxic to bone-forming cells and inhibits their activity (32-34). In addition, chronic heavy drinking can adversely affect bone metabolism indirectly, for example by contributing to nutritional deficiencies of calcium or vitamin D (7). Liver disease and altered levels of reproductive hormones, both of which can be caused by alcohol, also affect bone metabolism (7).
Calcium deficiency can lead to bone diseases, such as osteoporosis. Osteoporosis is characterized by a substantial loss of bone mass and, consequently, increased risk of fractures. It affects 4 million to 6 million mainly older Americans, especially women after menopause. In alcoholics, the risk of osteoporosis is increased (35). Because many falls are related to alcohol use (36), adverse alcohol effects on bone metabolism pose a serious health problem.
Studies with abstinent alcoholics have found that alcohol-induced changes in bone metabolism, including toxic effects on bone-forming cells, are at least partially reversible after cessation of drinking (32,33,37,38).
Hormones May Influence Alcohol-Seeking Behavior
The effects of alcohol on different hormonal pathways may in turn influence alcohol-
seeking behavior. For example, in animals, alcohol-seeking behavior appears to be regulated in part through a system called the renin-angiotensin system, which controls blood pressure and salt concentrations in the blood. In rats, activation of this system through alcohol consumption caused the animals to reduce their alcohol intake (39). The mechanism and relevance of this effect are currently under investigation.
Alcohol and Hormones--A Commentary by
NIAAA Director Enoch Gordis, M.D.
Alcohol's wide-ranging effects on the hormone system present many practical clinical concerns. For example, managing diabetes, particularly with the current emphasis on stringent control of blood sugar, is complicated by alcohol's interference with blood sugar levels. In the emergency room, stupor in patients with alcohol on their breath often is not caused by alcohol intoxication, but by the hypoglycemia (low blood sugar) that is a complication of heavy drinking. Failure to treat the hypoglycemia could have life-threatening consequences. Heavy drinking has a major effect on the reproductive system, affecting libido, fertility, and pregnancy. Heavy drinking also places postmenopausal women at risk for fractures from falls due to their increased risk for osteoporosis from alcohol's effect on blood estrogen levels coupled with their increased risk of falling due to drinking. However, it is possible that moderate alcohol use may help protect postmenopausal women against osteoporosis by raising blood estrogen levels. Scientists are working to discover for which population this may be true and at what drinking levels. Finally, research on how alcohol's interactions with hormones may contribute to the pathological drive to consume alcohol is just beginning and may provide valuable insight into the mechanisms by which alcohol-seeking behavior can be controlled.
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