Practical and up-to-date nutrition information by a certified nutritionist.The premier source for the science of food and nutrition.
Friday, October 23, 2009
What We Know About Vitamin D
Vitamin D decreases cell proliferation and is a powerful anti-inflammatory. There is preliminary evidence that it may lower the risk of multiple sclerosis, rheumatoid arthritis, lupus, heart disease, autism, and autoimmune thyroid disease. Vitamin D also plays a role in depression. Most studies are too new to show any long term effects. Firm conclusions will be based on further research.
For now, shoot for 700 to 1,000 IU of vitamin D per day. Most multi-vitamins supply 400 IU. Expect only 40 - 150 IU in most foods fortified with vit. D. Toxicity levels have not yet been established, though studies using as much as 3000 IU/day have shown no ill effects. Farmed salmon has about 1/4 the vit. D of wild salmon. Only a few foods (like fatty fish) have more that 220 IU of vit. D per serving. Ultra violet rays from the sun can prompt your skin, liver, and kidneys to make vit. D, but UV rays are too weak in the winter (unless you live as far south as Los Angeles or Atlanta), or use sunscreen. That's why it may be simpler to get vit. D from a supplement.
Wednesday, October 14, 2009
Powerful Pomegranates
Studies on both mice and humans have produced positive results in the reversal of atherosclerosis. After one year of drinking eight oz. of pomegranate juice daily, the people in a 2004 study showed a 35 % decline in thickness of the carotid artery walls. Over the same period, the people who did not drink the juice showed a 9% increase in the thickness of the carotid arterial wall.
Buying pomegranate juice is tricky, though. Only a quarter of the companies that market it are selling the actual product. Many of them contain cheaper juices (apple, grape, or pear) to stretch the more expensive pomegranate juice. Others are sweetened with sugars or colored with blackcurrant to assimilate the color of pomegranates. Check ingredient labels; the price is also a clue to an unadulterated product.
Fresh pomegranates, also known as "Chinese apples" sparkle in winter and holiday meals adding brilliant color, flavor and texture to dishes ranging from appetizers to desserts. The ruby colored fruit we refer to as seeds are called arils. Use the arils as a garnish or add to tossed salads. Each aril is a delicious sac of juice that surrounds a seed. Pomegranates can contain 840 arils that are compartmentalized between shiny, tough membranes. The arils range from pink to dark red. Whether you swallow the seeds or spit them out is a matter of personal preference. Keep in mind that the seeds add fiber; researchers suggest that the crunchy seeds help flush fats and cholesterol from the digestive tract.
The edible fruit from one medium pomegranate (5 ounces) contains 104 calories, 1.5 g protein, 26.4 g carbohydrates, 9 mg vitamin C and 399 mg potassium. One medium pomegranate weighs about 9 ounces and yields about 5 ounces of fruit (3/4 cup) and 4 ounces (1/2 cup) of juice.
WHOLE pomegranates keep well at room temperature for several days, away from sunlight; up to 3 months refrigerated in plastic bags.
For more ways to enjoy pomegranates, click POM recipes
Tuesday, October 13, 2009
Trans Fat & Breast Cancer
A 7 year study in France recently revealed that women with higher blood levels of trans fat were nearly twice as likely to be diagnosed with breast cancer as those with lower levels of trans fat.
~American Journal of Epidemiology~
Wednesday, October 7, 2009
Folate Linked to Breast Cancer
Researchers studied more than 1700 women in 1993 with high blood levels of folate. Ten years later, the women with the highest amount of blood folate levels were at a 70% higher risk of breast tumors that respond to estrogen or progesterone than those with the lowest levels. It is also believed that folate actually "feeds the tumor."
What to do? Until more studies are done, play it safe. If you take a multivitamin:
- Watch your cereals. Many breakfast/energy bars and cereals are fortified with folate or folic acid. If you typically eat more than one serving (about 1/2 - 1 cup) watch for cereals that contain 25 or 50% of the daily value for folic acid.
- Go whole grain. White pasta, rice, and breads are fortified with 100 to 130 mcg of folic acid per cup. Whole grain bread, pasta and brown rice are not.
- Don't worry about naturally occuring folate. The folate in orange juice, vegetables, beans and other foods isn't absorbed as well as the folic acid in fortified foods, so it's not a problem.
~ American Journal of Clinical Nutrition~
Monday, October 5, 2009
Lifestyle Links to Breast Cancer
A study reported by the Journal of Clinical Oncology (2009) found that being obese, smoking, and drinking alcohol all increase the risk of breast cancer being diagnosed a second time in women previously diagnosed with the disease.
The researchers looked at the records of more than 1,000 women successfully treated for early-stage breast cancer. About 360 of the women were later diagnosed with a new breast cancer in the opposite breast (known as contralateral breast cancer). The researchers wanted to know if being obese, smoking, and regularly drinking alcohol contributed to the risk of developing a second breast cancer.
The risk of developing a second breast cancer was:
- 40% higher in women who were obese compared to women who weren't obese
- almost doubled in women who drank seven or more alcoholic drinks per week compared to women who didn't drink alcohol or drank less
- more than doubled in women who smoked compared to women who didn't smoke
The researchers also found that women who drank regularly AND smoked were more than 7 times more likely to develop a second breast cancer compared to women who didn't smoke or drink regularly.
If you have been treated for early-stage breast cancer, try to do all you can to lower both your risk of the cancer coming back AND your risk of a new, second breast cancer. Along with the treatment plan you and your doctor choose, a healthy diet and lifestyle can help keep these risks as low as possible:- Maintain a healthy weight and eat a low-fat diet that includes generous servings of fruits and vegetables.
- Exercise regularly at medium intensity.
- Don't smoke. If you do smoke, make the effort to quit.
- Avoid alcohol.