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Friday, March 14, 2008

Atherogenesis

The putative ability of fish oils to affect cardiovascular health has focused considerable attention on lipid nutriture. Investigations of societies consuming high levels of omega-3 and -9 oils as well as both prospective and retrospective scientific studies have demonstrated the increasing importance of dietary fats.1-6 Complex mechanisms have been theorized but ultimately hinge on eicosanoid synthesis pathways. Fatty acids and other lipid substances such as cholesterol found within the circulation and as a part of the endothelial lining of blood vessels and their smooth muscle coat, and within platelets, provide an important substrate for vascular health or disease.

PLATELETS

Platelets play a pivotal role in the relationship between lipids and atherogenesis. Blood platelets are powerful biochemical packages wrapped in a phospholipid membrane. When platelets in the circulation are exposed to broken endothelial tissue lining blood vessels and underlying collagen. they become activated to stimulate the healing of the injury.

The arachidonic acid within the platelet forms two different eicosanoids, which serve two opposing functions. If the platelet is next to another platelet, thromboxane (TXA2) is formed (500 million platelets can form as much as 2 mg of thromboxane) which stimulates the aggregation and clotting of platelets and other blood components.7 For those platelets near the endothelium, prostaglandin E2 (PGE2) is formed which stimulates hyperplasia in the exposed blood vessel tissue and inhibits further clotting adjacent to the injury. Prostaglandins also stimulate bone resorption bringing calcium to the site of the injury to decrease tissue pH and further stimulate hyperplasia.

These are normal mechanisms occurring continually and are essential to life. If they did not occur, minor vascular lesions could lead to runaway hemorrhage, and healing and repair would not happen. However, when there is an excess of omega-6 fatty acids in platelets which can generate excess amounts of arachidonic acid at blood vessel injury sites, the blood clotting, vessel constricting, bone resorbing, and hyperplastic effects can exceed the countering moderating effects of prostaglandins from fatty acids such as the omega-3's.

PATHOGENESIS

High levels of dietary fat can result in high levels of low density lipoprotein (LDL). These protein-lipid complexes can contain large amounts of cholesterol, much of which can be oxidized as a result of the way modern foods are processed.8 LDL can migrate to areas of injury, be engulfed by monocytes and macrophages, and accumulate at the site of these injuries to provide more arachidonic acid and free radical generating oxidized cholesterol fuel for further endothelium damage.

This ongoing cycle, beginning with perhaps a small lesion which occurs as a matter of course in the endothelium, or induced injury as a result of high blood levels of oxidized fats, may turn out to be a self-perpetuating, out-of-control, cancerlike growth accumulating in vessels resulting in atheromas and eventual closure of coronary vessels leading to heart attacks. Additionally, hardening (sclerosis) of the arteries can result in hypertension and loss of vascular resiliency, potentially causing stroke, aneurysms, general loss of health and vigor, and predisposition to a range of other diseases.

In other words, if there is vascular injury, the normal clotting, vessel constricting, tissue regenerating mechanisms can run out of control as a result of an imbalance of moderating e1cosanoids which are ultimately derived from dietary lipids. In tissue with excess arachidonic cascade potential, vessel injury recruits excess platelets, which stimulate excess clotting, vessel constriction and vessel wall inflammation,

[ Atherosclerosis Sequence Image ]

http://www.wysong.net/articles/lipid/figures/figure26.jpg

which in turn releases more arachidonic cascade eicosanoids, which stimulate further platelet aggregation, clotting and so on, leading to atheroma and vessel closure.

If there is no initial endothelial injury but it is being induced from high oxidized lipid blood levels, a similar cycle occurs. Oxidized LDL's are scavenged by monocytes which become macrophages, which accumulate within the vessel wall causing free radical damage, foam cell formation, calcium deposition and inflammation. This produces arachidonic cascade metabolites, which further induce inflammation leading to progressive atheroma and vessel closure. (Fig. 26, 27)

PREVENTION RATIONALE

An alteration of the diet such that oxidized fats are decreased, saturated fats are decreased, omega-6 fats are decreased (in Western societies), and omega-3 and omega-9 rich foods are increased may potentially result in a restoration of health to the vessel wall. Prostaglandins created by omega-3 and omega-9 oils create opposite effects to the vessel constricting, clot-forming effects of the omega-6 oils since they compete for the same enzyme system. (Refer to Fig. 18) Therefore, if omega-3 and -9 fatty acids are increased in the diet, they use up the enzyme systems normally used byarachidonic acid to form the atherogenic promoting eicosanoids. This is the present explanation for the epidemiological evidence showing that humans and animals consuming higher levels of the omega-3 and omega-9 classes of fatty acids develop far less of the common cardiovascular problems than exist in Western society.

There is some evidence that the incidence of cardiovascular disease is proportional to the ratios of fatty acid classes in platelets, which is in turn related to diet. Eskimos, for example, have a higher omega-3 to omega-6 ratio in their tissues reflecting their high fish diet, which is in turn related to their low risk of cardiovascular disease compared to Western nations. (Fig. 28)

[ The Formation Of Atheroma Image ]

http://www.wysong.net/articles/lipid/figures/figure27.jpg

This is not to say omega-6 fatty acids such as linoleic are harmful per se. Balance is key. Indeed if sufficient linoleic is not present, atherosclerosis can result as evidenced in a variety of species.9,10

ASPIRIN

By shifting the balance of these same eicosanoid enzyme systems, aspirin is also believed to exert its effect as an anticlotting agent in cardiovascular disease. Aspirin is a specific inhibitor (acetylator) of cyclooxygenase which normally is used to convert arachidonic acid into TXA2 and PGE2. Aspirin's inhibition of clot forming TXA2 is several days longer than its effect on anticoagulating and vasodilating PGE2. Thus the net effect is clot inhibition. (Refer to Fig. 19)

[ Comparative Dietary Oil/Fat Composition Image ]

http://www.wysong.net/articles/lipid/figures/figure28.jpg

However, aspirin is a bandage. It does not address the root cause, which is dietary impropriety. It is also not without its dangers since it can precipitate allergic reactions such as asthma by shunting arachidonic acid into the lipoxygenase leukotriene path and may actually increase platelet clotting if given in conjunction with fish oils.11

Excess consumption of oxidized fats and fatty acids of the omega-6 family will fuel the atherosclerotic system. Excess raw materials can exceed the ability of moderators. If the root cause is dietary, the ultimate solution must therefore also be dietary, not pharmacologic. It is ironic that the 80 million aspirin tablets taken daily by Americans may in large part be necessary to cancel the effects of 15 million pounds of omega-6-predominant processed polyunsaturated oils.

NUTRIENTS

Many nutrients found within foods have the ability to block or modulate prostaglandin synthesis. These include sulfur compounds found in garlic, onions and cruciferous vegetables, and various minerals, particularly the divalent cations zinc, copper, lithium, silver, selenium, and calcium.12 A variety of fresh whole foods, (raw if possible) grown on nutrient-rich soils (as opposed to modern agribusiness mined soils where only nitrogen, phosphorus and potassium -- NPK fertilizers -- are replaced) provides the body with raw materials which augment proper fatty acid nutrition and may lessen or obviate the need for potentially dangerous drugs.

Other nonpharmacologic factors which may help produce more "friendly" lipid profiles include decreased stress, increased exercise and the elimination of tobacco and perhaps caffeine.13 Highly refined carbohydrate and sugar diets increase cardiovascular disease risk perhaps through increased glycosylation reactions, increased lipoprotein (a) levels and decreasing HDL levels.14 Calcium at 800 mg per day can decrease cholestero1.15 Chromium deficiency can decrease glucose tolerance factor and thus affect sugar metabolism and adversely affect lipid proflies.16Legumes, soluble fiber, garlic and onions can decrease cholesterol levels.17 Vitamin C at 1000 mg per day and vitamin E at 200-400 I.U. per day are excellent antioxidants and can decrease glycosylation reactions, decrease cholesterol and increase HDL'S.18 Pantethine, a derivative of pantothenic acid at 300 mg. 3-4 times daily,19 and niacin from 1-4 grams daily can positively affect lipids. Niacin in fact is one of the few agents capable of lowering genetically controlled Lp(a) levels.20 L-carnitine, an amino acid, at 1000 mg per day can ameliorate hyperlipoproteinemia.21

These nutrients are supplied in a varied whole raw food diet. Some researchers argue, however, that therapeutic levels of some nutrients are not possible from simply consuming natural foods. An accumulated deficit from a lifetime of dietary indiscretion may indeed require a boost. Disease, an extraordinary event, may require extraordinary measures to effect a cure. But before consuming any isolated nutrient become well aware of its merits and demerits since some nutrients can present toxicities or imbalances at certain levels. Guidance by a well qualified nutritional health care professional would be advised for anyone with existing disease who desires to use isolated nutrients in therapy.

As mentioned in the previous chapter, the case for the link between diet and heart disease is not closed. Some argue that the diet-heart hypothesis began, remains, and grows because of the support of powerful institutions and personalities who subserve gigantic health-disease and food industries.22 Some have calculated that for persons aged 20-62 that a lifelong program of cholesterol reduction might increase life expectancy three days to thirty months.23 Even Sir William Osler, the most highly respected physician of his time, said in 1879 that arterial degeneration could occur even at a young age and was due to "the high pressure in which men live, and habit of working the machine to its maximum capacity," not to excesses in eating and drinking. 24

There is little doubt that singular focus on diet or exercise, for example, misses the mark. It ignores equally important factors such as self esteem, affectionate relationships and feeling in control of one's life.25 The controversy aside, living and eating in a more natural synergonic context can only help and is likely the greatest potential for life free from disease.

References available within book text, click the following link to view this article on wysong.net:

http://www.wysong.net/articles/lipid/08_article_lipid_chapter_eight_atherogenesis.shtml

For further reading, or for more information about, Dr Wysong and the Wysong Corporation please visit www.wysong.net or write to wysong@wysong.net. For resources on healthier foods for people including snacks, and breakfast cereals please visit www.cerealwysong.com.

Dr. Randy Wysong: A former veterinary clinician and surgeon, college instructor in human anatomy, physiology and the origin of life, inventor of numerous medical, surgical, nutritional, athletic and fitness products and devices, research director for the present company by his name and founder of the philanthropic Wysong Institute. http://www.wysong.net. Also check out http://www.cerealwysong.com.

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Menopause And Weight Gain

If you're like many women who are thirty-and-forty-something, you've probably noticed that you're gaining weight that stubbornly refuses to take its departure. You're also probably thinking that this extra weight couldn't possibly be due to menopause - after all, you're still experiencing regular periods.

Weight gain in pre-menopausal women is quite normal because menopause actually occurs in three major stages and can take 15 years or longer, depending on your age and family history. The first stage of menopause is known as perimenopause, and symptoms include spotting, hot flashes, night sweats, irritability, irregular periods and weight gain.

Most women will notice weight gain as one of the first symptoms of menopause, especially around the abdomen. This is due to the fact that their hormone levels are declining drastically.

One of the hormones that will have an effect on women as they approach and experience menopause is estrogen, which is the female sex hormone that is responsible for causing monthly ovulation. During your menopausal years, your estrogen levels decline rapidly, causing your body to eventually stop ovulating. This is the hormone that seems to play a big role in menopausal weight gain. When your ovaries produce less estrogen, your body will look for other places from where to get needed estrogen. Fat cells in your body can produce estrogen, so your body works harder to convert calories into fat to increase estrogen levels.

Another hormone responsible for your new body is androgen, which can be blamed for sending your new weight to your middle section. In fact, weight gain during these menopausal years is often referred to as middle age spread due to the rapid growth of the mid-section. Often, this is one of the very first signs of menopause.

Women also experience a drop in their testosterone levels during these years. While its true that testosterone is known as the male hormone, women have testosterone too, and this hormone helps your body to create lean muscle mass out of the calories that you consume. Since muscle cells burn more calories than fat cells do, with higher testosterone levels youll have increased metabolism. Because your body is producing less testosterone during menopause youll notice a loss of muscle, an increase in body fat and a much lower metabolism. Muscle burns more calories than fat does, so the more muscle you have, the higher your metabolism will be. As you know, the lower your metabolism, the slower your body burns calories.

Women can benefit a great deal by committing to a regular exercise routine. It's important to know that weight training plays a very important role in losing the extra weight you've gained. You can keep the weight off by building muscle to help burn calories.

In summary, every woman's hormone levels decline at some point in their lives. Yes, this is going to result in some uncomfortable symptoms, but it's certainly not the end of the world. You can naturally reduce a lot of menopausal symptoms by simply making some lifestyle changes that will help to make you look and feel beautiful and energized.

Susan Megge is the founder of http://www.40isbeautiful.com, a website designed to assist mature women as they approach and experience menopause. She is a grandmother, who started experiencing symptoms of menopause several years ago and researched various avenues to deal with these symptoms naturally. This led to her discovery of the significant role that exercise plays in making menopause a very manageable, and even wonderful time in a woman's life.

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Acid Reflux And Bad Breath

Say you are at a party and all of a sudden you get that stinging feeling in your throat. You scrunch up your face, look around the room and walk to a place where nobody can see you as you try to swallow away that biting liquid. Your loosen your collar, swallow some more of your wine, and try to get back into the conversation. Yet, when you do get a circle and join in the conversation, people start to back away from you, pretend to scratch their nose, and claim to be needed elsewhere. You cant help but wonder if your recent bout of heartburn is related to your recent unpopularity?

One way that you can check if you have bad breath (if your best friend isnt at the ready), is to lick the inside of your wrist and let it dry for a few seconds and then smell it. If there is an odor, then your breath isnt as fresh as it should be.

If you are experiencing bad breath, or halitosis, then part of your problem might be either related to, or a direct result of acid reflux/GERD.

Most experts, medical and naturopathic alike will tell you that bad breath is caused by what you eat, lack of saliva swishing around in your mouth, stress, dehydration, and stomach activity, i.e. acid indigestion. Since many people experience acid reflux in their sleep, chances are good that morning breath isnt just a lack of saliva activity, but is related to GERD.

Most commentators speaking on bad breath list acid reflux as a major cause, in addition to the items mentioned above. It makes sense really. It stands to reason that acidic liquid rising up from your stomach is not going to smell pretty, and if that is getting up to your throat, through a loosening in the collapsible valve at the tip of your stomach, its going to make your breath smell pretty foul.

Not only that, but many of the factors that contribute to bad breath, are also causal factors for acid reflux. The foods that you eat are a major contributor to bad breath, like spicy or garlicky foods, which are also a major contributor to acid reflux. Stress is also a cause for both upsets.

It stands to reason then, that by counteracting the causal factors of GERD, you will also reduce your chances of having bad breath, not only in striking what may be the heart of your problem, but youll combat one or both of these ailments as well.

Contrary to popular belief, making changes to your diet and stress levels arent as difficult as some of the makers of pharmaceuticals would like you to believe. They would prefer you to think that a few changes in your diet, or a simple exercise plan will mean re-vamping your life entirely, but this is simply not the case.

Long term solutions are just thatlong term. So, make the changes, but make them slowly, incorporating them into your life in small steps so that the changes dont seem too drastic, making them easier to swallow (so to speak) and more likely steps that you will stick with.

Kathryn Whittaker has an interest in Acid Reflux. For further information on Acid Reflux please visit http://www.naturally-stop-acid-reflux.com/acidreflux.html or http://www.naturally-stop-acid-reflux.com/blog/2006/09/27/acid-reflux-and-bad-breath/.

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