In a pilot study of 14 older adults with mild cognitive problems suggestive of early Alzheimer's disease, Johns Hopkins Medicine researchers report that a high-fat, low-carbohydrate diet may improve brain function and memory. "Our early findings suggest that perhaps we don't need to cut carbs as strictly as we initially tried. We may eventually see the same beneficial effects by adding a ketone supplement that would make the diet easier to follow," says Jason Brandt, Ph.D., professor of psychiatry and behavioral sciences and neurology at the Johns Hopkins University School of Medicine. "It's something that 400-plus experimental drugs haven't been...