Advocates of the Paleo diet say they're healthier for not eating grains, dairy, and many fruits. But new research says - not so fast.
Australian researchers say Paleo followers have twice the amount of a key blood chemical linked closely to heart disease.
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They found that the diet, which is heavy on meat and low on carbs, changes intestinal bacteria.
It not only raises the heart-disease chemical, but also reduces beneficial species in the intestines.