This is a biased conclusion. The most logical answer is this: Anything we ingest can change our personality. Whether it's for the better or worse is an opinio

This is a biased conclusion. The most logical answer is this: Anything we ingest can change our personality. Whether it's for the better or worse is an opinion. The causative nature of how ingesting A causes a personality change of type B, must be investigated experimentally. You cannot just say eating veggies improves mood. Where is your data and what do you mean by "improve"?