The Paleo diet is attempting to eat like how our ancestors used to eat. Mainly Vegetables,Meats, Fruits, Nuts, and Seeds. The Paleo diet can be high in fat and cholesterol if you are consuming mainly animal based foods, in that case it may resemble the Atkins diet which is very bad for you. Dietary cholesterol does not contribute much to body cholesterol. Saturated fat plays a greater role, and even then only 1/3rd-1/4 of the body's cholesterol comes from dietary sources.
I myself have criticisms of the diet, as the Paleo diet does not support grains. The longest living cultures on earth have a diet heavy on grains, and vegetables. When you look at cultures that consume mainly meat such as the Eskimos, and Masai they have a much shorter lifespan. Cultures that consume more protein tend to have higher rates of osteoporosis, than cultures that do not. However if someone on the Paleo diet eats mainly fruits, and vegetables it may be different.
Just because you are vegan does not mean you are healthy. Soda is vegan ,and not made from any animal products. Consuming soda every day is not healthy. Another thing is anthropologists agree that after humans started eating meat their brain grew larger. Meat does play an important role in brain development. Regardless a diet higher fruits, and vegetables is considered optimal for humans as they contain many antioxidants, vitamins, and help the body function better, and age slower.