What aspect did neither of the passages discuss?

Focusing on the aspect that neither of the passages discussed allows us to identify what was absent from their content. The passages likely examined various topics relevant to each other, but the absence of discussion regarding negative aspects of their respective issues suggests that both passages adopted a more neutral or positive perspective on their subjects. This implies that while they may have highlighted benefits or cultural significance, they chose not to delve into the drawbacks or challenges associated with those issues.

On the other hand, aspects like the cultural significance of food or future implications of using additives could have been relevant themes explored in the passages, as they often encompass broader discussions surrounding the topics at hand. Historical references in engineering might connect to one of the passages if it discussed developments in the field. However, a focus on negative aspects was evidently not part of the discussions, making this the aspect that neither passage covered.