Blindly encouraging a ketogenic diet can actually be damaging. While the average person <i>slightly</i> benefits from a high-fat, low-carb diet, a small group of people (who have the APOE4 allele) are <i>unable to properly digest fat</i> and thus are <i>greatly</i> harmed by it.<p>Similarly, light alcohol consumption seems to slightly benefit the majority of people. But, for those with APOE4, it causes significant harm. So, tonic for one group is toxic to another.<p>It is far better if Alzheimer&#x27;s treatment is prescribed on a case-by-case basis, based on genetic, environmental, and familial factors. This maximizes the outcomes for all, and not just the average.