Soy: Healthy choice?

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To eat soy or not to eat soy? That's the question many people concerned about their health are asking, says Jennifer Reilly, senior nutritionist for the Cancer Project, a nonprofit organization in Northwest that encourages a healthy diet as a means of cancer prevention and survival.

The consensus lately has been that soy, like most other foods, is good eaten in moderation as part of a balanced, low-fat diet of whole grains, fruits and vegetables, Ms. Reilly says. It may help prevent cancer, fight heart disease and make bones stronger, she says.

"The bulk of the research shows that soy is beneficial, especially when consumed as a typical Asian diet," Ms. Reilly says.

With about 30 to 40 studies published on soy every month, it is possible to find a study to back almost every position on the food, Ms. Reilly says.

One recent study, "Meta-Analysis of Soy Intake and Breast Cancer Risk," looked at 18 epidemiologic studies on soy exposure and breast cancer risk, finding that soy consumption is helpful for preventing breast cancer, she says. The study was conducted at John Hopkins School of Medicine in Baltimore and published in April's Journal of the National Cancer Institute.

"The gray area is when women have had estrogen-receptor-positive breast cancer," Ms. Reilly says. "Since it's a gray area, we're not sure how much soy is safe for that person. Although a lot of researchers say it's probably still fine to have two to three servings a day, other researchers say since it's a gray area that you might as well do without it."

The study didn't address soy consumption among breast cancer survivors, the use of supplements and powders made of soy and the effects of soy consumption at different stages of life.

Another area of debate has been how soy affects thyroid function, Ms. Reilly says. It has been thought that goitrogens, natural chemicals in soy, interfere with iodine absorption in the thyroid.

"These foods only will cause problems when someone is not getting enough iodine in the diet," Ms. Reilly says. "Eating soy is part of a healthy, balanced diet, making sure you have enough iodine. Iodine is in seaweed, sea vegetables and iodized salt."

Soy should be included in a healthy diet, says Cynthia Clark, oncology nutrition specialist at Washington Cancer Institute at the Washington Hospital Center in Northwest.