Thinking of giving up meat from your diet? The potential health benefits of a green diet are well established, but a story by the Mother Nature Network (MNN) says there are also some potential side effects and health risks associated with a vegetarian lifestyle.

Could low cholesterol kill you? A study by the Honolulu Heart Program found that elderly people with a "low cholesterol concentration" had a "significant association with mortality." In addition, a 2009 review published in the American Journal of Clinical Nutrition found that while vegetarians have an overall lower rate of cancer compared with meat eaters, vegetarians do have a 39 percent higher rate of colorectal cancer.

Other health concerns associated with vegetarianism cited by MNN included lower bone mineral density and lower levels of vitamin B12. However, the publishers of the bone density study said the "magnitude of the association is clinically insignificant," at just around 5 percent.

Going vegetarian appears to have gained popularity in recent years. A recent Yahoo Sports article even examined the diet of Mixed Martial Arts (MMA) fighter Jake Shields. Though much of the media's focus has been on a worldwide trend toward bigger diets, whether that's Pizza Hut offering strange fast food mashups or yet another customer at the Heart Attack Grill proving that there is truth in advertising.

The lesson in these potential risk-factors seems to be that if you're going to become a vegan or vegetarian, you'll need to spend more time planning your nutritional choices to help ensure a balanced intake of vitamins and other nutrients. Though if you don't have the time or inclination for such efforts, there may be another option. University of Idaho nutritionist Katie Minor says that a "flexitarian" diet may be a viable third way.

"Flexitarians are people who are vegetarian most of the time, but once in a while will consume an animal protein," Minor told MNN. "The more restrictive you are with your diet, the more you'll have to closely monitor what you're consuming and the more likely your need will be to supplement. Work with a registered dietician to make sure you're not at risk for dietary deficiencies."

近幾年，素食主義悄然流行，越來越多的人加入了素食者的行列。不過，近日發(fā)布在自然母親網(wǎng)絡(luò)的一篇文章指出，純素食也有潛在的健康風(fēng)險(xiǎn)，比如，純素食者患腸癌的幾率更高、骨礦物密度偏低，以及更容易缺乏維生素B12等等。營養(yǎng)專家表示，加入純素食者行列意味著你要花更多的時(shí)間來規(guī)劃飲食結(jié)構(gòu)以保證各類營養(yǎng)攝入均衡。如果沒有精力和時(shí)間詳細(xì)規(guī)劃，營養(yǎng)專家建議不妨做一個(gè)“彈性素食者”，即大部分時(shí)間吃素，偶爾吃點(diǎn)肉補(bǔ)充動(dòng)物蛋白。