"I've got a Lovely Bunch of Coconuts" Coconut holds promise for Immune-Suppressed People - Letters to the Editor

Editor:

One of the concerns of health professionals involved in the treatment of HIV individuals is finding safe, nontoxic, and effective therapies. Over the years, various practitioners have advocated a plethora of alternative remedies, from acupuncture to herbs. More recently the search has turned up a very unlikely find: coconut oil. Once widely used in cooking, coconut oil has virtually disappeared from the American food supply, being found now only in certain ice creams (e.g., Haagen Daas), baked goods, and macaroons. These days, most people associate coconut oil with cosmetics as it is a popular hair and skin moisturizer.

Ongoing research, however, has revealed a virtual powerhouse of compounds in coconut oil that could offer considerable benefits to those with immune problems. These benefits can be broken into three groups: (1) medium chain triglycerides (MCTs), (2) antimicrobial fatty acids, and (3) safety.

MCTs

Medium chain triglyceride oils are a special class of fats that are digested and handled by the body in a different way from other fats. In lipid biochemistry, all fatty acids are classified according to the number of carbon atoms present in their structure, as well as the degree of saturation, or how many hydrogen atoms are bonded to the carbons. Short and medium chain triglycerides are those that have fatty acids with 12 carbons or less, while long and very long chain triglycerides are those having 1424 carbons. A fatty acid that has two hydrogen atoms linked up to each carbon atom is saturated. Further, a fatty acid with two hydrogens missing is monounsaturated. Lastly, a fatty acid with four or more hydrogens missing is polyunsaturated.

The predominant fatty acids in MCT oils are medium chain saturated fatty acids (MCFAs) and over 60% of the fats in coconut are MCFAs. Its important here to note the difference between coconut oil and commercial MCT oils: coconut oil contains a particular fatty acid called laurate, while commercial MCT oil preparations do not. As we shall see, it is primarily lauric acid that makes coconut oil of particular value to immune-compromised individuals.

How are they handled by the body? MCFAs from MCTs are digested and absorbed quickly and used for energy. Since one gram of fat provides over twice as many calories than either one gram of protein or carbohydrate, MCTs are a superior energy source. Because of their quick absorption and combustion, most MCTs are not stored as fat tissue by the body. MCTs actually have a thermogenic, or fat burning, effect. They are fats that help you stay slim by keeping your body fat levels down and your energy levels up. Additionally, because of their easy absorption by the body, MCTs are ideal for those with digestive problems, such as diarrhea, who might be having difficulty with long chain fatty foods.

Antimicrobial Fatty Acids

Coconut oil contains several antimicrobial fatty acids that can directly benefit HIVers and PWAs. The first is caprylie acid. Sold as a supplement in health food stores, this fatty acid has been used for decades as a remedy for intestinal yeast infections as caprylic acid directly kills such potentially harmful fungi as candida albicans and candida tropicalis. Intestinal yeast imbalances are a major concern for those on antibiotics as these drugs kill off the "good" intestinal bacteria that help to control yeast overgrowth. Coconut oil contains about 8% caprylic acid. Given this amount, integrating coconut oil into one's diet could help prevent and treat intestinal yeast overgrowth.

Some other fatty acids in coconut oil include capric (7%), myristic (18%), palmitic (8%), and oleic (6%). All of these are needed by the body to carry out a range of biological functions. Capric acid has also demonstrated significant activity against Herpes simplex-2, chlamydia, and HIV-1.

The major fatty acid in coconut oil, however, is the one being studied most closely. Laurie acid is a 12-carbon fatty acid that makes up almost 50% of coconut oil. Lauric acid is also one of the principal fats found in human breast milk. It is generally agreed that the lauric acid in breast milk is one of the key things that protects a baby's intestines from bacterial, protozoal, viral, and fungal infections until its immune system can gain enough strength to fend for itself.

Lauric acid converts into the substance monolaurin in the small intestines, a powerful, yet safe, antimicrobial substance. Research by lipid biochemists has shown monolaurin to inactivate fungi such as Candida albicans, and such bacteria as Listeria, Staphylococcus, and Streptococcus, as well as such viruses as Herpes simplex, Cytomegalovirus (CMV), Influenza, Measles, and HIV. Monolaurin apparently inactivates microbes by disrupting their lipid membranes.

The benefits here to HIVers should be obvious. Foods containing lauric acid help to maintain the integrity and health of the digestive tract, as well as help fight and kill a range of pathogens. Besides coconut oil, palm kernel oil and milk fat (butter, ghee, and cream) also contain lauric acid (50% and 5% respectively). Roquefort cheese also contains appreciable amounts of lauric acid.

Safety

A major benefit to using coconut oil is its safety: no side effects have ever been recorded with its use. Although some health professionals might be concerned over the high saturated fat content of coconut oil (about 94%), such worries are unwarranted as we shall see.

Research

No researcher has done more to call attention to the possible benefits of coconut oil to HIVers and PWAs than Dr. Mary Enig, PhD, formerly of the University of Maryland. Enig is a well-known lipid biochemist who has done extensive research on trans-fatty acids and their connections to heart disease, cancer, and immune dysfunction. More recently, however, she has turned her attention to lauric acid and its possible benefits to HIVers and PWAs. Enig authored a chapter on lauric acid in Nutrients and Foods in AIDS (CRC Press; 1999), and is currently involved in designing studies to demonstrate the benefits of lauric acid.

In addition to Enig's work, the first clinical trial involving coconut oil and monolaurin has just finished up in the Philippines. Preliminary results on the small trial indicated that greater than 50% of the patients had a reduced viral load and that one-third of the patients had a favorable increase in their CD4/ CD8 ratios. The study also indicated that the patients using cocnut oil fared better than those just on monolaurin supplements.

Enig also reports on anecdotal data indicating a significant reduction in viral load in individuals not on HIV drug therapies, who added 3-4 tbsp of coconut oil to their daily diet to yield 25 grams of lauric acid per day. Details on these stories can be found in her published works, as well as through the organization Keep Hope Alive.

More recent research conducted by Sadeghi, et al., has demonstrated that coconut oil in combination with fish oil decreases levels of pro-inflammatory cytokines such as Tumor Necrosis Factor (TNF(a)) and Interleukin-6 (IL-6), while stimulating production of anti-inflammatory cytokines such as Interleukin-10 (IL-10). High levels of TNF(a) are directly tied to wasting. It's interesting to note here the prevalence of coconut/fish dishes in Polynesian culture. Perhaps these native peoples knew there was something beneficial in this combination.

Integrating Coconut into the Diet

In her research, Enig has concluded that immune-compromised individuals should strive to ingest about 25 grams of lauric acid per day. Enig based this figure on comparative levels found in human breast milk. If one is using coconut oil, this amounts to 4 tbsp a day. One could easily incorporate such a small amount into one's diet by using coconut oil for sauteeing vegetables, or as a salad dressing with lemon juice, or as an additive to cooked cereals; 1 tbsp of coconut oil added to a bowl of hot oatmeal makes for a filling meal.

If one likes the coconut taste, canned coconut milk is another option. According to Enig, 4 ounces of coconut milk contains about 11 grams of lauric acid. Such a small amount could be used as an addition to protein shakes, hot cereals, soups, or smoothies. Enig likes to make "Coconut Cream Tomato Soup" by adding 1/4 of a can of coconut milk to a cup of heated tomato or V-8 juice. Of course, one could also prepare dishes that use coconut milk. It should he noted here that "Lite" coconut milk should not be used. Enig's analysis has shown that "Lite" coconut milk contains very little lauric acid.