Main criticisms would be that other argue grains are good for you, saturated fat is bad for you and that fat in general makes you fat. Paleo suggest you eliminate grains because they're not healthy, and replace those lost carbs with good fat including saturated fat from animal sources.
Paleo would argue that humans developed and evolved to their current state because of consuming a lot of fats to feed our brains. They further argue that fat is essential, keeps you fuller for longer and leaves you leaner and more energetic. Grains are very recent in our history.
I think the only real concern would be the guy who takes this approach as a license to eat 2 pounds of commercial low grade bacon a day. Beyond that eating whole natural food seems like a pretty well tested and sensible thing to do.
Paleo would argue that humans developed and evolved to their current state because of consuming a lot of fats to feed our brains. They further argue that fat is essential, keeps you fuller for longer and leaves you leaner and more energetic. Grains are very recent in our history.
I think the only real concern would be the guy who takes this approach as a license to eat 2 pounds of commercial low grade bacon a day. Beyond that eating whole natural food seems like a pretty well tested and sensible thing to do.