> You can't safely deactivate metabolic pathways at runtime in a single cell While I generally agree with your sentiment that it would be remarkably difficult

> You can't safely deactivate metabolic pathways at runtime in a single cell While I generally agree with your sentiment that it would be remarkably difficult to genetically modify the brain tissue of an adult, you have no idea if your statement is true or not. In fact, this is the whole point of CRISPR and similar forms of "gene therapy." Yes. You probably can't modify the genome of all cells in a large multi-cellular organism like us, but there may be ways of modifying selected/important tissues. > This type of thinking stems from a lack of familiarity with biochemistry, the molecular biology of genetics, and cell physiology. This is not warranted either.