Digestion begins in the mouth, not the stomach

Enders opens the digestive journey earlier than most people expect: chewing and saliva already begin breaking food down chemically, not just mechanically, since saliva contains enzymes like amylase that start splitting starches into sugars the moment food enters the mouth, well before it ever reaches the stomach.

She emphasizes that how thoroughly food is chewed measurably affects how efficiently the rest of the digestive system can process it — insufficiently chewed food forces the stomach and intestines to work harder to compensate, and can affect how much nutrition is actually extracted from a meal.

This opening chapter sets the tone for the whole book: digestion isn't a single event that happens "in the stomach," it's a coordinated, sequential process spanning multiple organs, each with a distinct and often underappreciated job. Takeaway: something as simple as chewing more thoroughly gives your entire digestive system an easier, more efficient job downstream.