A history of Rwanda that justified the existence of these racial distinctions was written. No historical, archaeological, or above all linguistic traces have been found to date that confirm this official history. The observed differences between the Tutsis and the Hutus are about the same as those evident between the different French social classes in the 1950s. The way people nourished themselves explains a large part of the differences: the Tutsis, since they raised cattle, traditionally drank more milk than the Hutu, who were farmers.