By Sherami Tsai When Harvard medical student Nick Norwitz switched from his usual meat-based ketogenic diet to a vegan version, his low-density lipoprotein (LDL) cholesterol—the so-called “bad” cholesterol—shot up 14 percent in just one week. Similarly, fellow researcher Dave Feldman saw his LDL more than double after transitioning from a pizza-and-candy-heavy diet to vegan keto.

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