14 Ağustos 2012 Salı

Increase Your Absorption of Carotenoids from Vegetables

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Enjoying a few slices of avocado in your tossed salad, or mixing some chopped avocado into your favorite salsa will not only add a rich, creamy flavor, but will greatly increase your body's ability to absorb the health-promoting carotenoids that vegetables provide.

A study published in the March 2005 issue of the Journal of Nutrition tested the hypothesis that since carotenoids are lipophilic (literally, fat-loving, which means they are soluble in fat, not water), consuming carotenoid-rich foods along with monounsaturated-fat-rich avocado might enhance their bioavailability.

Not only did adding avocado to a salad of carrot, lettuce and baby spinach or to salsa greatly increase study participants' absorption of carotenoids from these foods, but the improvement in carotenoid availability occurred even when a very small amount-as little as 2 ounces-of avocado was added.

Adding avocado to salad increased absorption of alpha-carotene, beta-carotene and lutein 7.2, 15.3, and 5.1 times higher, respectively, than the average amount of these carotenoids absorbed when avocado-free salad was eaten.

Adding avocado to salsa increased lycopene and beta-carotene absorption 4.4 and 2.6 times higher, respectively, than the average amount of these nutrients absorbed from avocado-free salsa. Since avocados contain a large variety of nutrients including vitamins, minerals, as well as heart-healthy monounsaturated fat, eating a little avocado along with carotenoid-rich vegetables and fruits is an excellent way to improve your body's ability to absorb carotenoids while also receiving other nutritional-and taste-benefits.

Avocado Phytonutrients Combat Oral Cancer

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Oral cancer is even more likely to result in death than breast, skin, or cervical cancer, with a mortality rate of about 50% due to late detection, according to Great Britain's Mouth Cancer Foundation. Avocados may offer a delicious dietary strategy for the prevention of oral cancer. Phytonutrients in Hass avocados, the most readily available of the more than 500 varieties of avocados grown worldwide, target multiple signaling pathways, increasing the amount of free radicals (reactive oxygen species) within pre-cancerous and cancerous human oral cell lines, that leads to their death, but cause no harm to normal cells. ? Semin Cancer Biol. 2007 May 17. Earlier research by UCLA scientists also indicates that Hass avocados may inhibit the growth of prostate cancer as well. When analyzed, Hass avocados were found to contain the highest content of lutein among commonly eaten fruits as well as measurable amounts of related carotenoids (zeaxanthin, alpha-carotene, and beta-carotene). Lutein accounted for 70% of the measured carotenoids, and the avocado also contained significant quantities of vitamin E. J Nutr Biochem. 2005 Jan;16(1):23-30.

Avocados and Babies

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The avocado's smooth, creamy consistency makes it one of the first fresh fruits a baby can enjoy. Sodium– and cholesterol– free, avocados contain valuable nutrients including 8% of the recommended Daily Value (DV) for folate; 4% DV for fiber and potassium, 4% DV for vitamin E; and 2% DV for iron. A serving of avocado also contains 81 micrograms of the carotenoid lutein and 19 micrograms of beta-carotene. Per serving, avocados have 3.5 grams of unsaturated fats, which are known to be important for normal growth and development of the central nervous system and brain.

Avocados and Heart Disease

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* Avocados can help consumers meet the dietary guidelines of the American Heart Association, which are to eat a diet that is low to moderate in fat. The fats should be primarily unsaturated and low in saturated fat and cholesterol. The avocado is virtually the only fruit that has monounsaturated fat.
* Avocados help assist consumers in meeting a major dietary goal of reducing saturated fat in the diet, when they are consumed in place of saturated-fat containing foods.

Avocados and Eye Health

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* Avocados are a good way to get more lutein in the diet. An ounce of avocado contains 81 micrograms of lutein. Lutein has been shown to be concentrated in the Macula of the eye, and research suggests that it may help maintain healthy eyesight as we age.
* Lutein is a natural antioxidant that may help maintain eye health as we get older. By adding avocado to foods like salads, salsa, soups or sandwiches you can get more of the phytonutrient lutein in your diet.