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The Wonders of Omega-3 Fatty Acids12


									The Wonders of Omega-3
Ronald Ladrillo Amigo BS in Food Technology III University of the Philippines Visayas

Outline of the Presentation

What are Essential Fatty Acids
  

Nomenclature and Terminology Food Sources Classifications


Omega-3 Fatty Acids
   

 

Chemistry List of n-3 Fatty Acids Biological Significance Health Benefits Health Risks Dietary Sources How to take it?

What are Essential Fatty Acids?
Also known as EFAs  They are fatty acids that cannot be constructed within an organism from other components by any known chemical pathways; and therefore must be obtained from the diet.

Nomenclature and Terminology

Fatty acids are straightchain hydrocarbons possesing a carboxyl (COOH) group at one end.  The carbon next to the caboxylate is known as α, the next carbon is β, and so forth.

Nomenclature and Terminology

 

The last position is labeled ω. Physiological properties of unsaturated fatty acids largely depend on the position of the first unsaturation relative to the end position (not the COOH). It is signified as ω minus n.


Food Sources

Almost all the polyunsaturated fat in the human diet is from EFA

The essential fatty acids start with the short chain polyunsaturated fatty acids (SC-PUFA):  ω-3 fatty acids:

α-Linolenic acid or ALA (18:3)


ω-6 fatty acids:

Linoleic acid or LA (18:2)



They form the starting point for the creation of longer and more desaturated fatty acids, which are also referred to as long-chain polyunsaturated fatty acids (LC-PUFA): ω-3 fatty acids:

eicosapentaenoic acid or EPA (20:5) docosahexaenoic acid or DHA (22:6)
gamma-linolenic acid or GLA (18:3) dihomo-gamma-linolenic acid or DGLA (20:3) arachidonic acid or AA (20:4)


ω-6 fatty acids:
  

Points to Ponder
Omega-3 and Omega-6 fatty acids cannot be synthesised by humans, as humans lack the desaturase enzymes required for their production.  ω-9 fatty acids are not essential in humans, because humans generally possess all the enzymes required for their synthesis.

The Omega-3

The term n−3 (also called ω−3 or omega-3) signifies that the first double bond exists as the third carbon-carbon bond from the terminal methyl end (n) of the carbon chain.

n−3 fatty acids which are important in human nutrition are: α-linolenic acid (18:3, n−3; ALA), eicosapentaenoic acid (20:5, n−3; EPA), and docosahexaenoic acid (22:6, n−3; DHA).

List of n-3 Fatty Acids
Common name Lipid Name 16:3 (n−3) Chemical name all-cis-7,10,13-hexadecatrienoic acid

α-Linolenic acid (ALA)
Stearidonic acid (STD) (ETE)

18:3 (n−3)
18:4 (n−3) 20:3 (n−3)

all-cis-9,12,15-octadecatrienoic acid
all-cis-6,9,12,15-octadecatetraenoic acid all-cis-11,14,17-eicosatrienoic acid all-cis-8,11,14,17-eicosatetraenoic acid

Eicosatetraenoic acid (ETA) 20:4 (n−3)

Eicosapentaenoic acid (EPA)
Docosapentaenoic acid (DPA), Clupanodonic acid Docosahexaenoic acid (DHA) (Nisinic acid)

20:5 (n−3)
22:5 (n−3)

all-cis-5,8,11,14,17-eicosapentaenoic acid
all-cis-7,10,13,16,19-docosapentaenoic acid

22:6 (n−3) 24:5 (n−3) 24:6 (n−3)

all-cis-4,7,10,13,16,19-docosahexaenoic acid all-cis-9,12,15,18,21-docosahexaenoic acid all-cis-6,9,12,15,18,21-tetracosenoic acid

Health Benefits
Clinical studies suggest that omega-3 fatty acids may be helpful in treating a variety of health conditions. These include the following:

High Cholesterol High amounts of omega-3 fatty acids from fatty fish, also tend to have increased HDL cholesterol and decreased triglycerides (fatty material that circulates in the blood)

High Blood Pressure Several clinical studies suggest that diets or supplements rich in omega-3 fatty acids lower blood pressure significantly in individuals with hypertension.

Heart Diseases Clinical evidence suggests that EPA and DHA found in fish oil help reduce risk factors for heart disease including high cholesterol and high blood pressure. In fact, eating at least 2 servings of fish per week can reduce the risk of stroke by as much as 50%.

Diabetes Omega-3 fatty acids from fish oil can help lower triglycerides and apoproteins (markers of diabetes), and raise HDL.

Arthritis Omega-3 fatty acid supplements reduce tenderness in joints, decrease morning stiffness, and allow for a reduction in the amount of medication needed for people with rheumatoid arthritis.

Depression People who do not get enough omega-3 fatty acids or do not maintain a healthy balance of omega-3 to omega-6 fatty acids in their diet may be at an increased risk for depression.
The omega-3 fatty acids are important components of nerve cell membranes. They help nerve cells communicate with each other, which is an essential step in maintaining good mental health.

Bipolar Disorder In a clinical study of 30 people with bipolar disorder, those who were treated with EPA and DHA (in combination with their usual mood stabilizing medications) for 4 months experienced fewer mood swings and recurrence of either depression or mania.

Menstrual Pain In a clinical study of nearly 200 Danish women, those with the highest dietary intake of omega-3 fatty acids had the mildest symptoms, such as hot flashes and increased sweating, during menstruation.

There are also evidences that omega-3 fatty acids may also prove helpful in protecting against the following:  Weight loss  Osteoporosis  Schizophrenia  Attention Deficit Hyperactivity Disorder  Eating disorder  Burns

Skin disorder  Asthma  Muscular degeneration  Colon cancer  Breast cancer  Prostrate cancer

Health Risks
The USFDA Center for Food Safety and Applied Nutrition noted that known or suspected risks of EPA and DHA n-3 fatty acids may include the possibility of:

Increased bleeding if overused (normally over 3g/day) by a patient who is also taking aspirin or warfarin.


Hemorrhagic stroke (only in case of very large doses) Oxidation on n-3 fatty acids forming biologically active oxidation products Reduced glycemic index control among diabetics



Suppression of immune and inflammation responses, and consequently, decreased resistance to infections and increased susceptibility to opportunistic bacteria.  An increase in concentration of LDL cholesterol in some individuals.

Dietary Sources

World's Healthiest Foods ranked as quality sources of: omega 3 fatty acids World's Healthies t Foods Rating excellent very good excellent very good excellent very good very good very good good

Food Flaxseeds Cloves, dried, ground Walnuts Oregano, dried, ground Salmon, chinook, baked/broiled Cauliflower, boiled Mustard seeds Cabbage, shredded, boiled Romaine lettuce

Serving Size 2 tbs 2 tsp 0.25 cup 2 tsp 4 oz-wt 1 cup 2 tsp 1 cup 2 cup

Cals 95.3 14.2 163.5 9.2 261.9 28.5 35.0 33.0 15.7

Amount (g) 3.51 0.20 2.27 0.12 2.09 0.21 0.20 0.17 0.08

DV ( % ) 146.3 8.3 94.6 5.0 87.1 8.8 8.3 7.1 3.3

Nutrient Dens ity 27.6 10.6 10.4 9.8 6.0 5.5 4.3 3.9 3.8

Broccoli, steamed
Brussel sprouts, boiled

1 cup
1 cup 1 cup 4 oz-wt 1 cup 4 oz-wt 1 cup

60.8 80.0 86.2 36.0 158.8 49.4

0.26 0.34 0.36 0.15 0.62 0.18

10.8 14.2 15.0 6.3 25.8 7.5

3.2 3.2 3.1 3.1 2.9 2.7

very good
good good good good good good

Winter squash, baked, cubes
Tofu, raw Summer squash, cooked, slices Halibut, baked/broiled Collard greens, boiled

Spinach, boiled
Kale, boiled Soybeans, cooked

1 cup
1 cup 1 cup

36.4 297.6

0.13 1.03

5.4 42.9

2.7 2.6

good good

Shrimp, steamed/boiled
Turnip greens, cooked

4 oz-wt
1 cup






Cod, baked/broi led Strawberri es Green beans, boiled Snapper, baked/broi led Scallops, baked/broi led Tuna, yellowfin, baked/broi led Raspberrie s Miso

4 oz-wt 1 cup 1 cup

119.1 43.2 43.8

0.32 0.11 0.11

13.3 4.6 4.6

2.0 1.9 1.9

good good good

4 oz-wt






4 oz-wt






4 oz-wt






1 cup 1 oz

60.3 70.8

0.12 0.14

5.0 5.8

1.5 1.5

good good

World's Healthiest Foods Rating excellent very good good DV>=75% DV>=50% DV>=25% OR OR OR

Rule Density>=7.6 Density>=3.4 Density>=1.5 AND AND AND DV>=10% DV>=5% DV>=2.5%

Available Forms

Fish Oil Capsules

Flaxseed Oil

How to take it?
As macronutrient, fats are not assigned Recommended Daily Allowances or RDAs. Only AI (Acceptable Intake) AMDR (Acceptable Macronutrient Distribution Range) For a macronutrient , the range of intakes that the U.S. Food and Nutrition Board (FNB) considers healthful.

AI (Acceptable Intake) 1.6 grams per day for men 1.1 grams per day for women AMDR (Acceptable Macronutrient Distribution Range) 0.6% to 1.2% of total energy

United States Food and Drug Administration (USFDA) Recommendations 3 grams per day for fish 2 grams per day for nutritional supplements

Thank You Very Much

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