Here is the very briefest of primers of how marrying two basic ideas—regeneration and information—can make you healthy. Lets start with:
Most of your body is replaced in around 3-4 weeks. The proteins that do such much of the body’s communication and information work generally survive minutes to days. Other information molecules—like DNA—are longer lived though continuously modified. Skeleletal elements, including skeletal proteins like elastin, survive longer. Your teeth, eye lens, and bone, last longer than other parts.
But not necessarily that long.