Sunflower seeds are healthy PART 2
- Diet rich in polyunsaturated fatty acids has immunosuppressive effects, ie weakens the body’s defense system against microorganisms and tumor cells because inhibits the lymphoma stimulation, chemotaxis and neutrophil phagocytic ability.
In fact, all diets rich in fats, regardless of their origin, inhibits the immune system, suppressing the lymphocyte proliferation.
- Atherosclerosis is a process that, among other things, is based on oxidation of low-density faction cholesterol, LDL.
Polyunsaturated fatty acids, which constitute the majority of fats in sunflower oil, are highly susceptible to oxidation and can increase the oxidative modifications of low density cholesterol, LDL, making it even more atherogenic. Since linoleic acid constitutes almost 90% of unsaturated fatty acids in the LDL fraction of low density cholesterol, it represents the major substrate of this fraction oxidation.
- The high intake of linoleic acid leads to an increased thromboxane production, favoring platelet and thrombosis aggregation.
Several studies recently published supports the view that linoleic acid ingestion, which represents 62% of sunflower oil, even in the usual limits, can be harmful, increasing the lipoprotein oxidation susceptibility.
A study carried in Japan between 1985 and 1996 found a correlation between the incidence of Crohn’s disease, or segmentation enteritis, and the Japanese dietary modification of a homogeneous populations.
The increasing of the incidence of Crohn’s disease was correlated with the increase of polyunsaturated fatty acid intake and animal protein. Within 40 years, between 1945 and 1985 in Japan, fat consumption increased six times.
Yet another example of the effect of polyunsaturated fatty acid oils. In the clinic, were described lung injuries in newborns, to whom were given large amounts of oxygen. It is believed that these injuries are due to oxygen reactions with different classes of biomolecules, in particular lipids in cell membranes. We know that in cell membranes are found in polyunsaturated essential fatty acids. Polyunsaturated fatty acids oxidation of cell membranes constitutes a component of injuries through oxygen.
Researchers have used many strategies to reduce or to remove the oxygen-induced lung injury. Because the cellular fatty acid composition can be modified through the composition in fatty acids in the diet, the degree of injury caused by oxygen can be also changed.
At the Virginia University, USA, where the researches were conducted, was observed how cell cultures enriched with polyunsaturated fatty acids become more sensitive towards oxygen toxicity.
Experiences on people and animals have shown that feeding large amounts of polyunsaturated fatty acids lead to enrichment with fatty acids of those tissues.
While polyunsaturated fatty acids increase the sensitivity toward the toxic action of oxygen, oleic acid, a monounsaturated fatty acid, protects against the injury induced by oxygen.
In the neonatal intensive care wards, fat emulsions infusions is a vital component in feeding premature infants, especially those with very low weight.
Substituting in lipid emulsions, polyunsaturated fatty acids with oleic acid, the authors obtained a higher survival.
Finally, other researchers noted that high intake of polyunsaturated fatty acids increases the risk of gallstone formation. And then with what we cook?
You can cook completely without oil, and food to be same tasty. However, for those who think they can not do it without oil, olive oil, in small amounts, is much better. Monounsaturated oleic fatty acid make 72% of the olive oil. Ideal would be cold pressed and unrefined oil.