When you hear the word “diet,” you may think of juice cleanses, Atkins, or some of the weight-loss-focused fad diets that came out of the ’90s and early 2000s. But this isn’t that type of diet.

People who followed the MIND diet more closely showed slower brain shrinkage and less grey matter loss over time, with the strongest differences equivalent to about 2.5 years of delayed brain aging.

Brain-computer interfaces can already let people control machines using signals from the brain, but uploading an entire human consciousness is a much stranger problem. Joe Scott examines why copying ...