Sunday, April 15, 2012

THE LIVER'S DETOXIFICATION FUNCTION

Your body doesn’t like to keep any molecules around for a long time. Even “good” molecules, such as hormones, are constantly being disassembled and reconstructed to prepare them to be recycled or eliminated. Thanks to detoxification enzymes, the liver is able to break up most molecules, even toxic and dangerous ones. Enzymes are molecules that act as catalysts in the transformation process. There are thousands of different enzymes, each with a unique role.

Think of this detoxification process as a two-phase wash cycle. Enzymes are like the soap that liberates grease into little droplets, removing impurities that the water can’t remove on its own. In the first part of the wash cycle (Phase 1), enzymes break toxins down into intermediate forms. Some toxins are ready for elimination at this stage, but others require a second wash cycle. In Phase 2, these intermediate compounds are routed along one of six chemically driven detoxification pathways, where they are further broken down, and then bound to specific types of protein molecules which act as “escorts” to guide them out of the body, allowing them to exit through the kidneys (in the form of urine) or the bile (in the form of feces). This process is called conjugation. Of the six pathways, three warrant special mention.

One of the most important systems in Phase 2 is the glutathione conjugation pathway, which utilizes glutathione for the detoxification of deadly industrial toxins such as PCBs, and the breakdown of carcinogens. Its activity accounts for up to 60 percent of the toxins excreted in the bile. Glutathione also circulates through the bloodstream combating free radicals. No other conjugating substance is as versatile as glutathione and the body’s supply of it, most of which is produced by the liver, is easily depleted. Exposure to high levels of toxins exhausts reserves of glutathione, possibly increasing susceptibility to cancer. Chronic disease, HIV, and cirrhosis use up reserves of glutathione. Excessive exercise, which increases oxidative stress and free radical production, and alcohol consumption, which blocks glutathione production, also deplete glutathione in the blood.

The weakest pathway in most people, from a dietary standpoint, is sulfation, the one responsible for the transformation of neurotransmitters, steroid hormones, drugs, industrial chemicals, phenolics (compounds derived from benzene, commonly used in plastics, disinfectants, and pharmaceuticals), and especially toxins from intestinal bacteria and the environment. Intake of too little dietary sulfur, a molecule that must come from our diets, is a cause of ineffective detoxification. If your exposure to substances that need to be detoxified via the sulfation pathway is high, but your sulfate reserves are low due to an inadequate diet, you will not be able to break down these toxins.

Studies have established a strong association between the function of the sulfation pathway and a variety of illnesses including Alzheimer’s disease, Parkinson’s disease, motor neuron disease, autism, primary biliary cirrhosis, rheumatoid arthritis, food sensitivity, and multiple chemical sensitivity. A comprehensive detoxification profile test identifies alterations in this pathway.

The body manufactures five different types of amino acids that form a third detoxification pathway: glycine, taurine, glutamine, arginine, and ornithine. Of these, glycine is the most important for the neutralization of toxins. In some cases, the body cannot make enough glycine to keep up with its own detoxification needs. Though not considered an essential amino acid because the body can make it, glycine production depends on an adequate intake of dietary protein. Individuals who eat a protein-deficient diet have trouble detoxifying environmental pollutants.

Glycine supplies can be depleted by lifestyle stresses. Benzoates for example, found in soft drinks, bind with glycine and rob the body’s store of it. One study found that people who consumed a large number of soft drinks had problems breaking down toluene, a common industrial organic solvent. Aspirin also slows down this detoxification pathway because it competes for available glycine in the liver. When the diet is supplemented with glycine, as well as the other nonessential amino acids, there is a noticeable improvement in the detoxification capabilities of many people.

Problems in Phase 1 and Phase 2 Detoxification

When the liver is “sluggish,” Phase 1 of the detoxification cycle may not be processing toxins at a normal and necessary speed. This causes toxins to accumulate in the bloodstream. If the hormone estrogen, for example, is not dismantled during Phase 1, the buildup can reach potentially harmful levels. Premenstrual tension can be an expression of this. Many factors can cause Phase 1 to become sluggish. As we age, our detoxification processes slow. Use of medications such as anti-ulcer drugs (cimetidine) and oral contraceptives; exposure to cadmium, lead, and mercury; and consumption of large amounts of sugar and hydrogenated fats hinder Phase 1 detoxification.

Substances that slow down Phase 1 detoxification, setting the stage for a toxic buildup, are called Phase 1 inhibitors. They affect the DNA of the liver cells, causing less detoxification enzymes to be produced. In addition to those mentioned previously, Phase 1 inhibitors include:

Grapefruit

Turmeric

Capsicum (found in hot peppers)

Cloves

Drugs containing benzodiazepenes and antidepressants

Antihistamines

Ketoconazole (used in antifungal medications)

Toxins from bacteria in the intestines

A different type of detoxification problem develops if Phase 1 breaks down toxins at so fast a rate that Phase 2 cannot keep up. In this situation, the toxic intermediates produced during Phase 1 waiting to be washed out in Phase 2 flood the system. Many of these intermediate compounds—stuck in between Phase 1 and Phase 2—are more dangerous than the original toxin. This bottleneck can become a biochemical nightmare, damaging the liver, brain, and immune system.

Some of the substances that accelerate the breakdown of toxins in the liver by increasing the production of Phase 1 enzymes, without a concurrent increase in Phase 2 enzymes, are known carcinogens—pesticides, paint fumes, and cigarette smoke. Others are well known for their detrimental effects, such as alcohol and steroids. Even some otherwise harmless substances such as limonene from lemons, increase Phase 1 detoxification. But unlike cigarette smoke, limonene does not create dangerous intermediate molecules. As you read the following list, keep in mind that it is not strictly a list of “bad” things, but of those that increase the rate of Phase 1 detoxification, and that this becomes a problem only when Phase 2 can’t keep up.

Phenobarbital

Steroids

Sulfonamide medications

Foods in the cabbage family

Charbroiled meats

High-protein diets

Citrus fruits

Vitamin B1

Vitamin B3

Vitamin C

Environmental toxins (exhaust fumes, paint fumes, dioxin, pesticides)

Cigarette smoke

Alcohol

Endotoxins from intestinal bacteria in the bloodstream

Exposure to a toxin, when coupled with exposure to another substance that speeds up Phase 1, is especially dangerous. The combination of alcohol and acetaminophen provides a good example. It’s not uncommon to drink heavily, and later take acetaminophen for the headache that follows. The intermediate compound (from acetaminophen) is an extremely toxic substance called n-acetyl-p-benzoquinoneimine (NAPQI). Under normal conditions, NAPQI is removed quickly during Phase 2, but alcohol intake forces more NAPQI into the liver than Phase 2 can handle.

Research has shown that specific foods and nutrients not only have a beneficial effect on detoxification capability, but can also provide a safe and viable approach to treating a variety of immune disorders and toxicity syndromes.

If two or more detoxification accelerants are combined, they can interact, with serious consequences. An individual on a prescription medication who smokes, for example, actually needs higher dosages of the medication because smoking causes the medication to be broken down faster than it normally would be during Phase 1. If Phase 2 can’t handle the extra burden, a detoxification bottleneck results. We predict that in the future, medical specialists will check detoxification capabilities in order to give more accurate drug prescriptions.

Problems in Phase 1 and Phase 2 liver detoxification are so prevalent, and have such a major impact on health that we believe it’s a good idea for everyone to have liver detoxification tests as part of a standard medical workup. This lab test can identify problems localized in the different detoxification pathways. If you suffer from chronic liver and gallbladder problems, you’re probably a candidate for this test. Abnormal results, of course, will require ruling out a liver disease before going ahead with detoxification therapy. Assessing detoxification function makes it possible to diagnose a problem before symptoms actually appear. Tests that measure Phase 1 and Phase 2 enzymes take much of the guesswork out of estimating the severity of liver detoxification dysfunction, and can to some extent indicate whether a person is at special risk for cancer, neurological disease, chemical and drug sensitivity, and immune problems.

Diet and Detoxification: Feeding Phase 1 and 2

You can take steps to keep your liver detoxification system running smoothly. Diet has a strong effect on detoxification enzymes, and foods can help “regulate” or balance Phase 1 and 2 activity. Eating foods that support the liver can reduce your susceptibility to damage from toxins and to conditions such as multiple chemical sensitivity syndrome, chronic fatigue syndrome, and cancer. Research has shown that specific foods and nutrients not only have a beneficial effect on detoxification capability, but can also provide a safe and viable approach to treating a variety of immune disorders and toxicity syndromes.

Essential fatty acids are vital for Phase 1 detoxification, and the standard American diet does not provide an adequate supply of these vital nutrients. Essential fatty acid intake in the form of cold-water fish and flaxseed oils have a demonstrated ability to heighten detoxification. Other sources of essential fatty acids include edible oils, such as those made from sunflower seeds, walnuts, and sesame seeds; wheat germ; and supplements of black current seed, borage, or evening primrose oil.

Eating fresh fruits and vegetables daily is a good way to continually replenish your body’s store of glutathione, necessary for one of Phase 2 pathways. High-quality protein nourishes both the amino acid and the sulfation pathways. Vegetable sources of sulfur for the sulfation pathways include radishes, turnips, onions, celery, horseradish, string beans, watercress, kale, and soybeans. Eggs, fish, and meat are also excellent sulfur sources.

Cabbage, brussels sprouts, broccoli, citrus fruits, and lemon peel oils support Phase 2 activity. Studies have shown dramatic results from consuming broccoli sprout extract, which inhibits the activity of Phase 1 enzymes and, simultaneously enhances the Phase 2 glutathione pathway. Broccoli sprout extracts are especially beneficial for people who have frequent or high-level exposure to pesticides, exhaust fumes, paint fumes, cigarette smoke, or alcohol. Anyone who is exposed to known carcinogens will benefit from broccoli sprout extract.

Foods to Support Liver Detoxification

Cabbage family

Cold-water fish

Flaxseed oil

Fruits (fresh)

Garlic

Nuts and seeds

Onions

Safflower oil

Sesame seed oil

Sunflower seed oil

Vegetables (fresh)

Walnut oil

Wheat germ and wheat germ oil


Nutritional Supplements to Support Liver Detoxification

Bioflavonoids

Black currant seed oil

Borage oil

Carotenes

Coenzyme Q10

Copper

Evening primrose oil

Folic acid

Iron

Lecithin

Magnesium

Manganese

N-acetyl-cysteine

Niacin

Riboflavin

Selenium

Silymarin (milk thistle)

Trace minerals

Vitamin A

Vitamin B6 (pyridoxine)

Vitamin B12

Vitamin C (ascorbic acid)

Vitamin D

Vitamin E

Vitamin K

Zinc

7 Comments:

Blogger Terri Pinder, APN said...

Thank you. I have to say that is one of the best written descriptions of liver detox system I have read. But I haven't read too many. Most lose me very quickly. You clearly know the subject, yet don't presume your reader does. Perhaps you could offer some suggestions for "visual aids"? I would love to benefit from a diagram of this process.

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