Loreena skrev 2011-08-20 09:59:20 följande:
Jag orkar inte sitta och översätta. Vad menar de i korthet?
I korthet;
Det är ingen fara att äta sojaprodukter. Det är inte ens en så pass undermålig proteinkälla som många gånger påstås utan en rätt hygglig faktiskt. Fler punkter tas up i texten. Nedan följer ett axplock av det jag tycker är mest intressant, men hela texten är relevant vill jag påpeka. LÄS DEN!
"At first glance the dire warnings about soy are plausible. After all, the active components of soy products are isoflavones, primarily genistein and diadzein, which are classified as phytoestrogens because of their molecular similarity to estrogen. For years soy has been recommended to women. The logic is that since it has some weak estrogenic capabilities, it may interact with estrogen cell receptors, thereby displacing actual estrogen. With no interaction, estrogen is inert. Since the isoflavones are so weak, they block the effects of estrogen without exerting much activity themselves.
One study suggests that soy isoflavones have about 1/10,000 the potency of “real” estrogen."
"Animal studies have been largely equivocal, with some showing a lowering of
testosterone with soy intake and others showing either no effect or an increase in T levels."
"A new study examined the true effect of soy on
testosterone in men.1 It was a meta-analysis and looked at past studies related to
testosterone and dietary soy in men, limiting its scope to research that met certain minimal scientific criteria. That left the authors with 15 placebo-controlled studies and 32 reports on 36 treatment groups. Among the items examined in those studies were total
testosterone; free, or active,
testosterone; and sex-hormone-binding globulin, a
protein that ties up and transports
testosterone in the blood.
The researchers found that soy protein or isoflavone intake had no significant effects on testosterone. Neither total nor free testosterone was negatively affected by dietary soy in any of the studies. Research that did show a lowering of T by soy had serious methodological flaws, rendering the findings useless. The authors of the meta-analysis did note one peculiarity, however, that may explain why soy has been linked to lower testosterone in men."
"Another study, published two years ago, involved seven healthy young men who ate two pounds of soybeans a day for one week.2 They showed no changes in estrogen or total and free
testosterone. They did, however, show an increase in brain activity, specifically an improvement in spatial cognitive performance. What’s interesting about that is that men are considered superior to women in that aspect of brain activity, and the often suggested reason is men’s higher
testosterone levels."
"Meanwhile, however, genistein, the primary isoflavone in soy, does affect other hormones in the body. For example, it lowers blood insulin and suppresses the fat-building properties of insulin in fat cells. Mouse studies demonstrate a lowering of bodyfat when the rodents are given genistein for only 12 days. Genistein appears to alter gene expression of lipoprotein lipase, an enzyme that transports fat into fat cells, in a way that reduces fat uptake. It seems to be particularly potent in reducing fat stored in muscle. That’s significant because excess muscle fat is related to insulin resistance and diabetes, although it acts differently in those who exercise or are physically active. Having large amounts of genistein actually causes fat cells to self-destruct, but that doesn’t happen through diet alone. On the other hand, genistein also boosts the gene coding for the enzyme that works with carnitine in transporting fat into the mitochondria, where fat is oxidized. Genistein further aids fat loss by increasing the genetic production of PPAR-a, which controls fat metabolism. Enhancing its activity also boosts fat oxidation."
"One hormone that soy does reduce is
cortisol. Produced in the cortex of the adrenal glands, which lie just above the kidneys,
cortisol is the body’s primary catabolic hormone. While essential to life, it’s also linked to muscle loss, brain cell loss and excess bodyfat, particularly in the midsection."
"A study just published also found that soy appears to aid respiration, a not unimportant consideration for those engaged in the heavy breathing of exercise—not to mention other activities that often feature heavy breathing."
"While soy is often labeled an inferior
protein source for bodybuilders, a host of studies that compared it to whey and casein showed little difference between them with regard to
protein synthesis. On the other hand, soy is a fast-acting
protein, and several studies show that it tends to boost the synthesis of proteins in the gut more than in muscle. Other studies show that the amino acids in soy tend to be oxidized more rapidly in the liver, leaving less for muscle
protein synthesis. From that vantage point, soy isn’t a junk
protein, but it is a bit inferior to milk proteins for purposes of muscle building."
"The one thing that you can take to the bank—no, forget the banks until they start providing credit, as the stimulus package mandated—is that eating soy will have no effect on either testosterone or estrogen. The one possible exception to that would be if you’re one of those rare types who produce equol from eating soy foods. Even so, you’d have to chow down a truckload of soy before you’d experience any noticeable estrogen effects."
