The Essential Role of Omega-3 Fatty Acids in Health and Aging

Omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are essential nutrients predominantly found in fatty fish such as salmon, mackerel, sardines, and trout. These compounds are integral to human health, offering a range of benefits that extend across various bodily systems.

Cardiovascular Health
Regular consumption of omega-3-rich fish has been associated with a reduced risk of cardiovascular diseases. These fatty acids contribute to the maintenance of healthy cell membranes and are involved in producing signaling molecules that regulate inflammation and immune responses. Notably, omega-3s help lower triglyceride levels, reduce blood clotting, and improve arterial health, thereby supporting a healthier cardiovascular system.

Brain Health
Omega-3 fatty acids are crucial for brain development and function. Adequate intake has been linked to a lower risk of cognitive decline and neurodegenerative diseases such as Alzheimer's. These fatty acids support cognitive function and may reduce the risk of Alzheimer's disease.

Inflammation and Aging
Beyond cardiovascular and cognitive benefits, omega-3s possess significant anti-inflammatory properties. They produce metabolites that alleviate inflammation and facilitate cell and tissue healing. Chronic inflammation is associated with conditions like heart disease, cancer, and cognitive decline; thus, omega-3s play a role in mitigating these risks.

Recent research suggests that a daily intake of omega-3s may also slow the aging process. A major clinical trial involving nearly 800 healthy older adults found that taking one gram of omega-3 for three years resulted in participants aging three months less according to biological markers. When combined with vitamin D and regular exercise, this effect was enhanced to nearly four months.

Dietary Recommendations
Health organizations generally recommend a minimum of 250 mg and a maximum of 4,000 mg of combined EPA and DHA per day. The American Heart Association suggests eating two servings of fish (3-4 ounces) per week as part of a heart-healthy diet. It takes about 4-5 ounces of Atlantic salmon to provide 3 grams of omega-3 fatty acids. Fish oil supplements typically provide about 300 milligrams per pill, though doses vary.

Incorporating omega-3-rich foods into one's diet is a practical approach to harnessing these health benefits. For those who may not consume sufficient fish, omega-3 supplements can serve as an alternative, though it's advisable to consult with a healthcare provider before beginning any supplementation.

In summary, omega-3 fatty acids are vital components of a healthy diet, contributing to cardiovascular health, cognitive function, and the reduction of inflammation. Regular consumption of omega-3-rich fish or appropriate supplementation can play a significant role in maintaining overall health and potentially slowing the aging process.
The Essential Role of Omega-3 Fatty Acids in Health and Aging

Omega-7 in fish

Fatty acids are essential to human life because they are the cell’s primary energy source. Fatty acids also serve as cellular structural components. Ingesting the proper fatty acids confers significant health and longevity benefits.

Omega-7 fatty acids are unsaturated fatty acids found in certain fish, like salmon, herring, mackerel and anchovy. Omega-7s differ from omega-3s and 6s in two main ways. First, like omega-9s, omega-7s are categorized as monounsaturated fats, whereas omega-3s and omega-6s are polyunsaturated in nature.

Omega-7s are considered non-essential fatty acids, meaning human body can make enough omega-7s to function properly. In other words, human body does not need to get them from foods or supplements.

Studies associate a higher fish intake with slower cognitive decline and a reduced risk for Alzheimer’s. Omega-fatty acids, which are plentiful in oily fish like salmon and mackerel, may help reduce inflammation throughout the body.

Omega-7 can help break the cycle of high blood sugar, elevated lipid levels, and excess fat gain as well as enhance insulin sensitivity. Omega-7 has been shown to cause an increase in fat breakdown and an increase in the enzymes involved in fat burning for energy. Additionally, omega-7 can reduce new fat synthesis in the body.

One of the most common forms of omega-7s is palmitoleic acid, which also is found in a few foods, including some fish, such as salmon and cod. In the body, palmitoleic acid plays a role in fat metabolism, and research suggests it also might have a role in insulin sensitivity and cholesterol metabolism.
Omega-7 in fish

Seafood lipids and fatty acids

Lipids are known to be the building blocks of the fats or fatty substances found in animals and plants. They are microscopic layered spheres of oil which, in animals are composed mainly of fats and oils, waxes, phospholipids, steroids (like cholesterol), and some other related compounds.

The amount of lipids and fatty acid composition in seafood is known to be influenced by various factors in different species or within a species, such as geographical region, season, feeding habits and diet, age, sex, spawning period etc.

Seafood lipids encompass important healthy nutrients, such as n-3 polyunsaturated fatty acids (n-3 PUFAs), which may have a significant effect on human cardiovascular health and needs to be supplied by the human diet.

Among these fatty acids, n-3 PUFAs represent a large share. Particularly, eicosapentaenoic acid (EPA; 20:5 n-3) and docosahexaenoic acid (DHA; 22:6 n-3) are the most abundant n-3 PUFA present in seafood.

Fish consumption satisfies nutritional requirements for essential n-3 fatty acids, primarily eicosapentaenoic and docosahexaenoic acids, which are two long chain polyunsaturated fatty acids mainly present in fish.

DHA is mainly found in the brain and the retina, and it plays a key role for the development and maintenance of the visual and cognitive systems.

DHA is essential for normal fetal brain and cognitive development as the formation of neuron synapses in the brain depends strongly on the integration of this fatty acid into growing neurons. Meanwhile, EPA serves as a precursor of eicosanoids which are hormonelike substances such as prostaglandins, thromboxanes and leucotriens.

Consumption of large amounts of n-3 PUFA exerts a positive effect on a wide array of cardiovascular health concerns ranging from hypertension and atherosclerosis to myocardial infarction and stroke. In fact, animal studies indicate that n-3 PUFAs play a bioactive cardiovascular protective role.
Seafood lipids and fatty acids 

Fish oils

Fish oils are probably the most complex of all naturally occurring fats. Lipids are mainly present in fish oil as triacylglycerols (TAGs), fatty acid esters of glycerol. Glycerol carbon atoms are numbered according to a stereochemical system, positions sn-1 and sn-3 being the outers, position sn-2 the central one.

Fish oil is an excellent source of omega-3 fatty acids. Omega-3 fatty acids; EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are marketed worldwide as valuable dietary supplements with numerous benefits for children and adults. Some research suggests that these fatty acids can improve skin health, as well as specific skin conditions, such as eczema and acne.

Fish meat is a source of iodine, phosphorus and zinc and the nutritional value of dietary fiber is high. Fish meat has 66 - 84% water, 15 - 24% protein, 0.1 - 22% fat, 0.8 -2% mineral substance and 1 - 3% glycogen and fish oil has 20% saturated fatty acid and 80% unsaturated fatty acids.

Fish oils differ in their fatty acid composition depending on the species of origin and seasonal variations. Fish oils obtained from species reared in cold waters have higher contents of these fatty acids.

Fish oils, produced by a cooking process, are pressed and purified in several steps. The proteins are denatured and removed by pressing. Thereafter, the oil is separated. The oil phase, which contains omega-3 fatty acids, is refined in several steps: neutralization, followed by bleaching, degumming or winterization, and deodorization.
Fish oils

Polyunsaturated Fatty Acids In Fish

Fish are highly acclaimed to be included in the human diet because of the content in the muscles of polyunsaturated fatty acids (PUFAs), essential amino acids, fat-soluble vitamins, and micro and macro elements.

Fish are a major dietary source of polyunsaturated fatty acids in humans since the human body lacks the necessary enzymes required to synthesize them.

The fatty acid profile of fish differs between and with species even in dark and white muscle, which are affected by many factors such as the temperature, salinity, season, size, age, species habitat, life stage, and the type and abundance of food, especially whether a species is herbivorous, omnivorous or carnivorous.

The PUFAs are considered as the functional active factor in many species. PUFAs actively participate in gonad maturation, egg quality and larval growth of fish.

(PUFAs) can be further categorized in various groups based on their chemical structure. Omega fatty acids are categorized according to the position of the first double bond—the dissimilarity between them is articulated by the number of omegas. Two main compound groups can be distinguished among PUFAs: ω-3 and ω-6 families.

ω-3 and ω-6 are defined ‘‘essential’’ fatty acids since they are not synthesized in the human body and are mostly obtained from the diet.

Omega-3 or ω-3 fatty acids are vital for normal growth and development and may play an important role in the prevention and treatment of coronary artery disease, hypertension, diabetes, arthritis, other inflammatory and autoimmune disorders, and cancer. While ω-6 fatty acids are essential for normal growth, development and health.
Polyunsaturated Fatty Acids In Fish

Fatty acids in fish

Lipids are organic molecules containing many carbon atoms in a variety of chain or ring conformations. There are five major classes of lipids: fatty acids, triglycerides, phospholipids, sterols and sphingolipids.

Fatty acids are carboxylic acids with long-chain hydrocarbon side groups. Fish lipids are very high in polyunsaturated fatty acids, up to 40% of long chain highly unsaturated fatty acids, containing 5-6 double bonds.

Fresh water fish are slightly lower in polyunsaturated fatty acids. The high level of unsaturated fatty acids in fish provides flexibility to cells and other tissues because these fatty acids are fluid even at cold temperatures.

The fatty acids of fish oil vary according to fish species. The fatty acids in fish oils include eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), both of which are omega-3 fatty acids.

Cold water fish have extra amounts of fat for insulation against cold; contain more omega-3 acids than leaner, warm-water fish. Cold-water fish include albacore tune, salmon and mackerel while leaner warm water fish include cod, catfish, halibut, sole and snapper.
Fatty acids in fish

Fatty fish consumption found to slash risk of dementia, Alzheimer's

Fatty fish consumption found to slash risk of dementia, Alzheimer's
A new Tufts University issue of the journal Archives of Neurology has found that people with diets high in fatty fish run a significantly lower risk of developing dementia and Alzheimer's disease.

The study examined the diets and dementia levels of nearly 900 men and women who participated in the Framingham Heart Study. Researchers followed the participants for nine years, and found that 99 people developed dementia, including 71 who developed Alzheimer's disease.

The researchers examined the participants' blood levels of docosahexaenoic acid (DHA) -- a polyunsaturated omega-3 fatty acid -- and found that those with the highest DHA levels had a 47 percent lower risk of developing dementia, and a 39 percent lower risk of developing Alzheimer's, compared to participants with lower blood DHA levels.

"If you have a high level of DHA, a fatty acid found in fish, it reduced your risk of dementia by about half," said the study's lead researchers, a senior scientist and director of the Lipid Metabolism Laboratory at the Jean Mayer U.S. Department of Agriculture Human Nutrition research Center on Aging at Tufts University.

Omega-3s have long been lauded as beneficial to cardiovascular and circulatory system health. "Just as fish is good for your heart, it's probably food for your brain as well," researcher said.

Researcher study found that blood levels of DHA can differ depending on the liver's ability to convert ALA (alpha-linolenic acid, another fatty acid) into DHA. However, the greatest influence on blood DHA levels was the amount of fish consumed.

The Framingham participants who ate the most fish per week had the highest blood levels of DHA, while those who ate the least fish had much lower levels. Though researcher believes supplementing the diet with fish oil capsules would be as effective as eating fatty fish -- such as mackerel, herring, lake trout, sardines, salmon and albacore tuna -- some experts believe more study is needed to determine the link between fish oil supplements and prevention of dementia.

According to consumer health advocate Mike Adams, author of "The Seven Laws of Nutrition," researcher's study shows that the oils found in fatty fish can protect the nervous system from degenerative damage. "But what most people don't know is that those same healthy oils can also be found in many plants, including chia seeds, flaxseed, avocados and macadamia nuts," Adams said.
Source: www.naturalnews.com
Fatty fish consumption found to slash risk of dementia, Alzheimer's