The writer representing pritkin makes a couple of assumptions.

One - He keeps stating that these are high-fat diets when actually they are low carbohydrate diets. Big difference.

Two-"But science has proven that eating saturated fat increases cholesterol, which in turn can cause heart disease. " He did not reference which study but in my research little has been shown about eating fats in combination with low carbohydrates.

Read Protein Power and Life without bread - they address some of these myths.