看看这个 ：http://chriskresser.com/arsenic-in-rice-how-concerned-shou
白米饭比brownrice好。
Brown rice: Not a health food!
Brown rice, on the other hand, has significantly more arsenic than white rice and should be avoided or consumed rarely. Some of the brown rice brands tested contained at least 50% more than the safe limit per serving, and a few even had nearly double the safe limit. (PDF with complete details of test results) Note that some of the worst offenders for arsenic are made from brown rice: processed rice products like brown rice syrup, brown rice pasta, rice cakes and brown rice crisps. These processed products are commonly consumed by those following a “healthy” whole grain rich or gluten-free diet, but they clearly pose a significant risk of arsenic overexposure, especially if a person eats more than one serving per day. Obviously, brown rice is not a food that should be a dietary staple, or even eaten on a regular basis.
No food is completely safe or without some level of contamination risk: vegetables make up 24 percent of our arsenic exposure and tap water can legally contain 10 ppb arsenic per liter (some systems even exceed the legal limit.)
Brown rice: Not a health food!
Brown rice, on the other hand, has significantly more arsenic than white rice and should be avoided or consumed rarely. Some of the brown rice brands tested contained at least 50% more than the safe limit per serving, and a few even had nearly double the safe limit. (PDF with complete details of test results) Note that some of the worst offenders for arsenic are made from brown rice: processed rice products like brown rice syrup, brown rice pasta, rice cakes and brown rice crisps. These processed products are commonly consumed by those following a “healthy” whole grain rich or gluten-free diet, but they clearly pose a significant risk of arsenic overexposure, especially if a person eats more than one serving per day. Obviously, brown rice is not a food that should be a dietary staple, or even eaten on a regular basis.
No food is completely safe or without some level of contamination risk: vegetables make up 24 percent of our arsenic exposure and tap water can legally contain 10 ppb arsenic per liter (some systems even exceed the legal limit.)
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