Everything didn't go well, though

So while it's impossible to tell if Einstein’s diet contributed to his tremendous brainpower, the famed physicist was, unfortunately, plagued by chronic gastrointestinal issues throughout his life. These included both stomach ulcers and jaundice.

The physician diagnosed him with a “chronic stomach malady” and mandated a four-week diet of rice, macaroni, and zwieback bread, which is a dry, crunchy German bread similar to Melba toast.