@Stahesh His second slide, An Interesting Correlation, makes the assertion that brains grew because of an increase in animal meat consumption, and while that may be correct, it does not necessarily follow. Additionally, what information is he using to conclude the 10% shrinkage, and what are these "markings" on the skeletons? I don't have enough information from his presentation.
@Stahesh I will agree about healthier dental records for sure. Often the conclusion about what was in the diet is based on the dental records. Higher consumption of grain results in sugars being left on the teeth which in turn means more tooth decay. Healthy skeletal remains points to more consumption of dairy though, not just meat though it stands to reason that you'd have one with the other.