Showing posts with label Alpha-linoleic acid. Show all posts
Showing posts with label Alpha-linoleic acid. Show all posts

Monday, April 15, 2013

Article in Chicago Tribune

Since the Kentucky debate on hemp, when the issue was aired in the LA Times and the NY Times,
there has been a media blackout, despite several states - Minnesota, Missouri, Maine, New Hampshire, West Virginia, Hawaii - joining the fight.  An April 10 article in the Chicago Tribune Lifestyle section mentions it, along with other seeds, which are interesting enough to include; article is by Andrea Donsky and Randy Boyer
 
 
Seeds are a crucial food source for birds, squirrels, livestock and other animals, especially during winter. For humans, edible seeds provide a delicious, nutrient-packed punch to meals and snacks, and are the source of most of our cooking oils, as well as some spices and beverages.

Seeds are quite high in calories because of their natural oils but don't let that dissuade you from enjoying them. Their nutritional value is worth every calorie. A few interesting edible seeds that top the nutrient charts are chia, flax, hemp and pumpkin seeds.
Chia Seeds

While most of us remember the "Ch-ch-ch-chia Pet" as an '80s gimmick, the ancient plant is actually regarded as a superfood, with many clinically proven health benefits.

Chia, Salvia hispanica, a plant belonging to the mint family, was so highly recognized by the Aztecs that it was often used as currency. The powerful seeds, referred to as "running food," sustained Aztec runners, hunters, traders and warriors on long expeditions, often as their only source of nourishment.

Today, experts suggest that chia is one of the most nutritionally complete foods found in nature. In addition to being an excellent fiber source (mostly insoluble, which creates bulk for stool), chia is a rich plant-based source of Omega-3 fatty acids, consists of about 20 percent protein, and contains high levels of antioxidants, calcium, magnesium and iron.

Research has shown that chia has enormous potential to prevent and treat cardiovascular disease and Type 2 Diabetes. It can lower blood sugar (glucose) after a meal, reduce inflammation (C-Reactive Protein) and blood pressure, and is a natural blood thinner.

Since chia can absorb several times its weight in water, it helps the body maintain hydration, an important advantage to athletes and to those living in hot climates.

Gluten-free chia seed can be added -- whole or ground -- to a wide range of foods, including cereals, breads and bakery products, yogurt, desserts, pasta, and even soups and mayonnaise.

Flax Seeds

Flax has been cultivated for centuries and has been celebrated for its usefulness all over the world. Hippocrates wrote about using flax for the relief of abdominal pains, and the French Emperor Charlemagne favored flax seed so much that he passed laws requiring its consumption!

The main health benefits of flax seed are due to its rich content of Alpha-Linolenic Acid (ALA), dietary fiber, and lignans.

The essential fatty acid ALA is a powerful anti-inflammatory, decreasing the production of agents that promote inflammation and lowering blood levels of C-Reactive Protein (CRP), a biomarker of inflammation. Through the actions of the ALA and lignans, flax has been shown to block tumor growth in animals and may help reduce cancer risk in humans.

Lignans are phytoestrogens, plant compounds that have estrogen-like effects and antioxidant properties. Phytoestrogens help to stabilize hormonal levels, reducing the symptoms of PMS and menopause, and potentially reducing the risk of developing breast and prostate cancer.

The fiber in flax seed promotes healthy bowel function. One tablespoon of whole flax seed contains as much fiber as half a cup of cooked oat bran. Flax's soluble fibers can lower blood cholesterol levels, helping reduce the risk of heart attack and stroke.

Ground flax seed provides more nutritional benefits than does the whole seed. Grind the seeds at home using a coffee grinder or blender, and add them to cereals, baked goods, smoothies, and yogurt.

Store dry, whole flax seed in an airtight container at room temperature for up to a year. Ground flax seed should be refrigerated, also in an airtight container. Properly stored, it will keep for up to three months.

Hemp Seeds

Hemp has been an important resource and source of nutrition for thousands of years. While Cannabis sativa L. and other non-drug varieties of Cannabis, commonly known as hemp, have not been cultivated for use much in recent years, interest in the versatile plant has been restored worldwide.
Studies have identified hemp seed as a functional food and important food resource. Technically a nut, hemp seed contains over 30 percent fat and about 25 percent protein, with considerable amounts of dietary fiber and other nutrients. Nutritionally, hemp seed -- or hemp heart -- is best known for its polyunsaturated fatty acids (PUFAs). It's an exceptionally rich source of the essential fatty acids linoleic acid (omega-6) and alpha-linolenic acid (ALA), and a rare source of gamma-linolenic acid (GLA) and stearidonic acid.

The two main proteins in hemp seed are edestin and albumin. Both of these high-quality proteins are easily digested and contain nutritionally-significant amounts of all essential amino acids, arginine in particular.
Some of the known health benefits of hemp include increased energy, improved metabolism and immunity, reduced food cravings, and it can help lower blood pressure. Hemp hearts also contain plant sterols that have been shown to reduce cholesterol.

In the U.S., hemp seeds are used to produce food, nutraceuticals, and body care products. Natural Product stores and supermarkets sell a variety of hemp-based foods, including hemp hearts, hemp bars, hemp protein shakes, hemp milk (non-dairy beverage), and cereal made with hemp.

Pumpkin Seeds

Pumpkin seeds have 373 calories per half cup. They are a good source of minerals, including zinc, iron, magnesium, phosphorus, potassium, copper, and manganese, as well as protein and fiber. Only one ounce provides about 7 grams of protein.

Pumpkin seed oil is rich in essential fatty acids (EFAs). EFAs have many benefits, among them the maintenance of healthy blood vessels and nerves, and all tissues, including the skin.

The oil is also rich in phytosterols, plant-based fatty acids that are similar enough to cholesterol that they can replace it in the human body, contributing to the reduction of blood cholesterol levels.

Pumpkin seeds have long been associated with a healthy prostate. The protective compounds present within the seed of the pumpkin, which include zinc and phytosterols, may help to shrink an enlarged prostate. For prevention, eat a handful (about 1 ounce) of raw pumpkin seeds three times a week.

Eating seeds raw is always preferred as roasting them deteriorates or destroys many of the nutrients. Add whole seeds to hot or cold cereals, baked goods (breads and cookies), salads, steamed vegetables, or grind them up to add to burgers, chili and casseroles.

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Andrea Donsky and Randy Boyer are the co-founders of NaturallySavvy.com, a Website that educates people on the benefits of living a natural, organic and green lifestyle. For more information and to sign up for their newsletter, visit www.NaturallySavvy.com.

Saturday, January 12, 2013

Hemp seed oil vs. fish liver oil

An issue on this blog has been Omega-3 oils, which are found in hemp seed. They are also found in fish oils, and it is always suspect that fish oil is sold so heavily by the likes of Whole Foods while hemp oil is ignored. Maybe something to do with the wealth of the fishing industry? The following piece by Dionne Payn which appeared last year  in HempLifestyleMagazine.com gives us a lot of insight into this issue:



You've probably heard about how good omega-3 and 6 fatty acids are
for human health. The common advice is that to get a good supply in
your diet you need to eat oily fish on a regular basis.

Not many people know that hemp is a fantastic source of omega-3 and
6 fatty acids. But can hemp replace fish oil in the diet? Before we
get into that, let me start by giving you the lowdown on why these
fatty acids are important for good health.

What are essential fatty acids anyway?

Alpha-linoleic acid (ALA) is an omega-3 fatty acid and is known as
an 'essential' fatty acid. Our bodies can't make it so we need to
consume it through the food we eat. Our bodies convert ALA to the
longer chain fatty acids, eicosapentaenoic acid (EPA) and
docosahexaenoic acid (DHA).

EPA and DHA are very important for good health. They are powerful
anti-inflammatory compounds, which is beneficial as inflammation is
the cause of many degenerative diseases. EPA & DHA also lower blood
pressure and blood triglycerides which can reduce the risk of
strokes and heart disease.

Linoleic acid (LA) is an essential omega-6 fatty acid and is the
precursor to gamma-linolenic acid (GLA). We get plenty of omega-6
fatty acids in our diet from sources such as cooking oils (soybean,
sunflower, and canola oil), poultry and eggs.

The problem is that our intake of omega-3 fatty acids is too low,
yet our intake of omega-6 fatty acids is too high. The typical
Western diet has an omega-6 to omega-3 ratio of 15:1 but the
recommended ratio is 3:1. In a number of clinical studies, patients
with diseases such as rheumatoid arthritis and asthma have reduced
their symptoms just by eating the correct balance of omega-6 to
omega-3.

The general advice is to consume more oily fish such as mackerel,
salmon & sardines, or take supplements that contain concentrated
amounts EPA & DHA. But what if you don't want to eat fish or take
fish oil supplements?

The problem with fish and fish oils

There are a few issues to consider when deciding to consume fish or
fish oils. Firstly, there is the human health aspect. Our oceans
are polluted with methylmercury, polychlorinated biphenyls (PCB's)
and dioxins, and these contaminants are found in fish. Fish that
are predatory (eat other fish) are large and at the top of the food
chain, and so tend to contain more toxins.

Governments around the world are advising pregnant and
breastfeeding women to limit the amount of fish they eat as mercury
can cause harm to unborn babies or young children.

For the general population, the medical consensus is that the
benefits of eating fish far outweigh the risk to human health from
these toxins. However to be on the safe side, many people choose to
avoid fish and fish oil supplements altogether.

Then there is the environmental issue. In 2010, Time Magazine
published an article which asked the question, "Is the fatty-acid
craze threatening our ecosystem?" They made the point that the
market for omega-3 supplements doubled to $1 billion US dollars
between 2006 - 2010.

Environmentalists feared that menhaden, a small filter feeding
species of fish, were being overfished to produce fish oil
supplements. This led to 13 out of 15 Atlantic States banning the
fish oil company that caught 90% of the fish from their waters.

Fish oil companies strenuously deny that they are having an effect
on declining fish stocks arguing that only 1% of fish catch is used
for making supplements. However, a Canadian research group argued
that the recommended dose of 100 mg of fish oils per day was not
sustainable and would lead to fish stocks collapsing by the middle
of the 21st century.

Then there is the question of whether it is ethical to kill fish
for food or fish oil. The Vegetarian Society's website states that:

"Fish have a nervous system and pain receptors like all other
animals" and "an estimated 23% of that total catch is killed and
discarded as a result of 'incidental capture".

So if you choose not to eat fish or use fish oils, where do you get
your beneficial omega-3 fatty acids?

Plant sources of omega-3 fatty acids

Because eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)
are only found in oily fish, a lot of research has focused on how
much alpha linoleic acid (ALA) can be found in plants.

By far, the best source of ALA is flax seed (over 50%), followed by
hemp (15-20%), walnut (14%), canola (11%) and soy (7%). While ALA
can be converted to EPA & DHA in the body, the conversion between
ALA to EPA is not very efficient; even in healthy people it is only
2-5%.

The reason for this is that ALA has to be converted to a fatty acid
called stearidonic acid (SDA) before it can be converted to EPA.
The enzyme responsible for this conversion is very inefficient and
this effect is worse in the elderly, people suffering from diabetes
or obesity, and people that have a high omega-6 intake.

The good news is that if you take SDA directly, the conversion to
EPA is much easier, which hasn't gone unnoticed by big
Agri-companies. Monsanto have cottoned onto this (excuse the pun)
and have genetically modified the soya bean to produce SDA, while
BASF is working on genetically modifying canola to do the same.

Thankfully for us, hemp is a natural source of SDA and we don't
have to resort to GM foods to get a plant based source of our
omega-3's.

Hemp is one of the few sources of a rare omega-6 fatty acid,
gamma-linolenic acid (GLA). GLA has a similar chemistry to EPA and
has many of the health benefits of EPA.
Ideal dosages

According to the Good Oil Website, a daily dose of 1 tablespoons of
hemp oil will gove you 94% of your recommended daily allowance of
omega-3 and 94% of your recommended daily allowance of omega-6
fatty acids.

A comparison of flax and hemp oil

As I mentioned before, flax contains more ALA than hemp, but does
not contain SDA. Many people that try flax oil find it has a strong
aftertaste which can be a bit off-putting. Flax oil also has a
short shelf life, needs to be used as quickly as possible after
pressing and should be kept in the freezer, otherwise it turns
rancid.

In comparison, hemp contains linoleic acid (omega-6) and alpha
linoleic acid (omega-3) in the optimum 3:1 ratio for human health
and it has a pleasant nutty taste. It does need to be kept
refrigerated to preserve the quality of the oil, but is more robust
and doesn't go off as quickly as flax oil.

Summary

Omega-3 & 6 fatty acids are important for our health and longevity,
and it is great to know that we aren't restricted to consuming fish
or fish oils to get our recommended dose. If you want to avoid fish
for ethical reasons, hemp is a fantastic alternative.

Reading

http://en.wikipedia.org/wiki/Essential_fatty_acid
http://heart-disease.emedtv.com/fish-oil/fish-oil.html
http://www.professional-counselling.com/omega-3-side-effects.html
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/mercury_in_fish?open
http://www.foodstandards.gov.au/consumerinformation/mercuryinfish.cfm
http://www.time.com/time/magazine/article/0,9171,1953700,00.html
http://www.vegsoc.org/page.aspx?pid=723#
http://ontheshelf.com/attached-file/hempandflax.pdf
http://manitobaharvest.com/articles_studies/3810/Hemp-Seed-Oil---Your-source-for-essential-fat.html
http://www.thefishsite.com/articles/654/are-dietary-recommendations-for-fish-oils-sustainable
http://www.echiumoil.eu/health-benefits.php
http://goodwebsite.wordpress.com/2009/07/