Even better, the walnut diets seemed to activate a process called
autophagy, which the researchers described as “a neuronal housekeeping function,” in the striatum and hippocampus areas of the brain. This process was more profound in the hippocampus, though, which is the region of the brain involved in memory and cognitive performance. The discovery of the autophagy in the walnut-eating groups was particularly exciting because as we age, this process slows down.