Morbid Obesity Learning Center

DHEA (dehydroepiandrosterone) is an endogenous hormone (made in the human body) secreted by the adrenal gland. DHEA serves as precursor to male and female sex hormones (androgens and estrogens). DHEA levels in the body begin to decrease after age 30, and are reported to be low in some people with anorexia, end-stage kidney disease, type 2 diabetes (non-insulin dependent diabetes), AIDS, adrenal insufficiency, and in the critically ill. DHEA levels may also be depleted by a number of drugs, including insulin, corticosteroids, opiates, and danazol. There is sufficient evidence supporting the use of DHEA in the treatment of adrenal insufficiency, depression, induction of labor, and systemic lupus erythematosus. There is a lack of available studies on the long-term effects of DHEA. However, DHEA may cause higher than normal levels of androgens and estrogens in the body, and theoretically may increase the risk of prostate, breast, ovarian, and other hormone-sensitive cancers. Therefore, it is not recommended for regular use without supervision by a licensed healthcare professional.

DHEA is the acronym for dehydroepiandrosterone, a hormone produced naturally from cholesterol in the adrenal glands of males and females. It is a precursor to the male sex hormone testosterone. It is also sold as an over-the-counter dietary supple...

5-HTP is the precursor of the neurotransmitter serotonin. It is obtained commercially from the seeds of the plant Griffonia simplicifolia . 5-HTP has been suggested as a treatment for many conditions. There is some research to support the use of 5-HTP in treating cerebellar ataxia, headache, depression, psychiatric disorders, fibromyalgia, and as an appetite suppressant or weight-loss agent. There is not enough scientific evidence to support the use of 5-HTP for any other medical condition. 5-HTP may cause gastrointestinal disturbances, mood disturbances, seizure, or abnormal blood counts. Some reported side effects might result from contaminants in 5-HTP products.

The acronym for 5-hydroxytryptophan (or 5-hydroxy-L-tryptophan) is 5-HTP, a compound found primarily in the brain. This compound is made from tryptophan, a natural amino acid inherent in foods. Tryptophan is an essential amino acid, which means th...

Soy is a subtropical plant native to southeastern Asia. This member of the pea family (Fabaceae) grows from 1-5 feet tall and forms clusters of 3-5 pods that each contain 2-4 beans. Soy has been a dietary staple in Asian countries for at least 5,000 years. During the Chou dynasty in China (1134-246 B.C.), fermentation techniques were discovered that allowed soy to be prepared in more easily digestible forms such as tempeh, miso, and tamari soy sauce. Tofu was invented in 2nd Century China. Soy was introduced to Europe in the 1700s and to the United States in the 1800s. Large-scale soybean cultivation began in the United States during World War II. Currently, Midwestern U.S. farmers produce about half of the world's supply of soybeans. Soy and components of soy called "isoflavones" have been studied for many health conditions. Isoflavones (such as genistein) are believed to have estrogen-like effects in the body, and as a result, they are sometimes called "phytoestrogens." In laboratory studies, it is not clear if isoflavones stimulate or block the effects of estrogen or both (acting as "mixed receptor agonists/antagonists").

The soybean has been a part of the human diet for almost 5,000 years. Unlike most plant foods, the soybean is high in protein and is considered equivalent to animal foods in terms of the quality of the protein it contains.

A meat analog is a manufactured food product that looks and tastes like meat. Vegetarians and other health-conscious individuals eat meat analogs because they are relatively high in protein . They are also very versatile and can be broiled, baked,...

Taurine, or 2-aminoethanesulfonic acid, was originally discovered in ox ( Bos taurus ) bile and was named after taurus, or bull. A nonessential amino acid-like compound, taurine is found in high abundance in the tissues of many animals, especially sea animals, and in much lower concentrations in plants, fungi, and some bacteria. As an amine, taurine is important in several metabolic processes of the body, including stabilizing cell membranes in electrically active tissues, such as the brain and heart. It also has functions in the gallbladder, eyes, and blood vessels, and may have some antioxidant and detoxifying properties. Taurine is a constituent of some energy drinks, including Red Bull®. Numerous clinical trials suggest Red Bull® and similar energy drinks may be effective in reducing fatigue, and improving mood and endurance. However, these drinks contain other ingredients, which may also offer benefit in these areas, including caffeine and glucuronolactone. The effect of taurine alone in energy drinks has not been studied. Thus, the effectiveness of taurine in energy drinks is unclear and further research is still required. Several taurine derivatives are being investigated for medical use, such as taltrimide as an antiepileptic drug. Other taurine derivatives in various stages of development include acamprosate (antialcoholic), tauromustine (anticancer), and tauroursodeoxycholic acid (liver disorders). The efficacy of taurine has been investigated for diabetes, hypertension (high blood pressure), cystic fibrosis, liver disorders, cardiovascular disorders, and nutritional support. Although promising in many fields, additional study is needed before a firm recommendation can be made for these indications. Taurine is added to many infant formulas based on the decreased ability to form taurine from cysteine in this population.

Psyllium, also referred to as ispaghula (or isphagula), is derived from the husks of the seeds of Plantago ovata . Psyllium contains a high level of soluble dietary fiber, and is the chief ingredient in many commonly used bulk laxatives, including products such as Metamucil® and Serutan®. Psyllium has been studied as a "non-systemic" cholesterol-lowering agent, with generally modest effects seen on total cholesterol and low-density lipoprotein levels. Several psyllium-containing cereals such as Heartwise® and Bran Buds® have appeared in the U.S. marketplace during the last 15 years and have been touted for their potential lipid-lowering and "heart health promoting" effects. Allergic reactions, including anaphylaxis, have been reported, particularly in healthcare workers with previous experience preparing psyllium-containing bulk laxatives. Obstruction of the gastrointestinal tract by such laxatives has also been reported, particularly in patients with prior bowel surgeries or anatomic abnormalities, or when mixed with inadequate amounts of water.

Cellulose derivatives (methylcellulose), calcium polycarbophil, malt soup extract, and psyllium preparations are bulk-forming laxatives.

Psyllium is a seed used for medicinal purposes taken from the common fleawort, Plantago psyllium . There are about 250 species of the genus Plantago found worldwide; they belong to the Plantaginaceae family. The most common species producing seed ...

Lutein and zeaxanthin are found in high levels in foods such as green vegetables, egg yolk, kiwi fruit, grapes, orange juice, zucchini, squash, and corn. For some commercially available supplements, lutein is extracted from marigold petals. Lutein and zeaxanthin are carotenoids in the macular region of the retina of the eye (macular pigment), and thus lutein has been studied for its use in treating cataracts, preventing macular degeneration and retinal degeneration. Lutein and zeaxanthin also have antioxidant capabilities as well as the ability to trap short-wavelength light. The potential for carotenoids, including lutein, to play a preventing role in cardiovascular disease and cancer was recognized in the 1990s. Most of the information surrounding lutein is based on blood and/or dietary intakes of lutein compared with disease states (e.g. cancer, eye disorders, lung function, muscle soreness, obesity, and pre-eclampsia). More evidence is needed before recommendations can be made in these fields.

Found in certain fruits and vegetables as well as egg yolks, lutein is a nutrient with a number of potentially beneficial effects. It is a member of the carotenoid family, a group of chemicals related to vitamin A . While betacarotene, the precurs...

Guggul (gum guggul) is a resin produced by the mukul mirth tree. Guggulipid is extracted from guggul, and contains plant sterols (guggulsterones E and Z), which are believed to be its bioactive compounds. Prior to 2003, the majority of scientific evidence suggested that guggulipid elicits significant reductions in serum total cholesterol, low-density lipoprotein (LDL), and triglycerides, as well as elevations in high-density lipoprotein (HDL). Although recent evidence provides preliminary evidence against the efficacy of guggul for hypercholesterolemia, and thus, further study is necessary before a definitive conclusion can be reached. Initial research reports that guggulsterones are antagonists of the farsenoid X receptor (FXR) and the bile acid receptor (BAR), nuclear hormones that are involved with cholesterol metabolism and bile acid regulation.

The mukul myrrh tree, or Commiphora mukul , is small, thorny, and usually devoid of foliage. It grows naturally throughout India and Arabia. Guggul is the gum resin that comes from this tree, which belongs to the same genus as myrrh and has some s...

The main function of L-carnitine is to transfer long-chain fatty acids in the form of their acyl-carnitine esters across the inner mitochondrial membrane before beta-oxidation. In humans, it is synthesized in the liver, kidney, and brain and actively transported to other areas of the body. For example, 98% of the total body L-carnitine is confined to the skeletal and cardiac muscle at concentrations approximately 70 times higher than in the blood serum. Supplementation may be necessary in rare cases of primary carnitine deficiency, which may be caused by a defect in carnitine biosynthesis, a defect in carnitine active transport into tissue, or a defect in renal (kidney) conservation of carnitine. Known conditions of secondary deficiency of carnitine (insufficiency), in which L-carnitine is effective, include chronic stable angina and intermittent claudication characterized by distinct tissue hypoxia (low oxygen levels). Another condition that may benefit from carnitine supplementation is decreased sperm motility. Although use in preterm infants suggests carnitine supplementation may aid in maintaining or increasing plasma carnitine levels and possibly weight gain, carnitine is not routinely added to preterm total parenteral nutrition (TPN). However, soy-based infant formulas are fortified with carnitine to levels found in breast milk. In 1986, the U.S. Food and Drug Administration (FDA) approved L-carnitine for use in primary carnitine deficiency. D-carnitine or DL-carnitine may cause secondary L-carnitine deficiency and should not be used.

Amino acid derivative; naturally occurring substance required in mammalian energy metabolism.

Carnitine is an amino acid that is essential for babies and nonessential for others. In this context, essential means it must be obtained in the diet. Nonessential types of amino acids can be synthesized to some extent within the body. The kidney ...

Evening primrose oil (EPO) contains an omega-6 essential fatty acid, gamma-linolenic acid (GLA), which is believed to be the active ingredient. EPO has been studied in a wide variety of disorders, particularly those affected by metabolic products of essential fatty acids. However, high-quality evidence for its use in most conditions is still lacking.

Evening primrose oil is a dietary supplement derived from the seeds of the evening primrose plant, Oenothera biennis . Its Latin name is derived from the Greek word for wine, reflecting the folk belief that the plant could relieve the symptoms of ...