I find human dietary studies fascinating due to some of the conclusions reached. At best, we can identify food types and macros associated with human health and disease for that matter. There can be no definitive conclusion reached other than to track major changes in human dietary habits based on food types consumed. We are omnivores and we are opportunistic when survival is at stake. Today, we humans are in the midst of a major dietary change with the consumption of manufactured and processed foods never before seen in history. We also are in the midst of an epidemic of major metabolic health issues never before recorded at the scale experienced today. If we consider the food types consumed most commonly throughout human history, it shouldn't be hard to separate them from those causing the suspected health issues that have spiked since the 20th century. It's reasonable to associate these newer, manufactured foods as root cause candidates for our current and common metabolic health issues. In this context, chasing the question as to whether humans consumed primarily plants or animals in the past seems unlikely to lead to an informed conclusion.