Nutrition. A lot of this might just be meta-research, but I feel like we still don&#x27;t really understand what an optimal diet looks like, and if optimal diet might differ from person to person. We learn more every day about how big of a factor it is in disease processes, especially the two biggest ones in the US  - heart disease and cancer.<p>I think preventive care in general is a great area to dive into, and this seems like a good place to start.