28 Jun 2019 --- A high-fat, low-carbohydrate diet – similar to a keto or Atkins diet – may improve brain function and memory in older adults, according to new John Hopkins Medicine research. The study involved 14 people with mild cognitive issues suggestive of early Alzheimer’s disease and found an improvement to their memory after six weeks. While more research is needed, it is possible that the diet could be used as a treatment for minor cases of dementia.