Most ketogenic diets (including the John Hopkins version) use large
amounts of vegetable oils to obtain their fat ratios.  These are known to
raise cholesterol.

Ray Audette
Author "NeanderThin:A Caveman's Guide to Nutrition"
http://www.sofdesign.com/neander

Gary Ditta wrote:
>
> There's a nice study by Phinney et al (80) Metabolism 32(8):757-7680 "The
> Human Metabolic Response to Chronic Ketosis Without Caloric Restriction:
> Physical and Biochemical Adaptation" showing that a ketogenic diet
> *elevates* total cholesterol while leaving HDL unchanged. The study
> involved 9 lean men who were switched from a calorically adequate high carb
> diet containing 1.75 g/kg bodywt P, 67% C, 33% F to a calorically
> comparable ketogenic diet containing <20g/d C, identical P, and 83-85% F.
> Over a four week period, average cholesterol rose from 159 to 208. HDL was
> unchanged at 40.