Digestion Begins With The Eyes

The body begins preparing for food long before the first bite.

What I Know to Be True: Digestion Begins With the Eyes

How often do you find yourself eating while something else is happening?

Your phone in one hand. The television on in the background. A laptop open beside your plate. A YouTube video playing while you rush through a sandwich. A podcast filling the silence. Or standing at the kitchen counter, taking quick bites between feeding your kids.

Modern life has turned eating into something we do while doing something else.

But digestion begins long before the first bite.

The moment your eyes see food and your nose catches its aroma, your brain sends the signal: meal time.

This triggers what is called cephalic phase of digestion - the body’s anticipatory response to food. Through vagal nerve signaling, the brain begins activating the digestive system before food even reaches the stomach.

Salivary glands increase saliva production.
Digestive enzymes begin to be released.
The stomach starts preparing acid and gastric secretions.
The pancreas and gut begin preparing for the work ahead.

In other words, the digestive system is being switched on.

When eating begins, chewing provides the first stage of mechanical digestion while enzymes in saliva (like amylase) start breaking down carbohydrates. From there, coordinated muscle contractions guide food down the esophagus toward the stomach, where the next stages of digestion continue.

Digestion isn’t a single event that begins in the stomach. It is a coordinated process involving the brain, nerves, enzymes, and organs working together.

And all of it works more efficiently when the nervous system is in a state that allows digestion to occur– what we often refer to as rest and digest– or the parasympathetic state.

Trying to eat while distracted, rushed, or stressed is a bit like using a food processor that’s unplugged. The ingredients may be there, but the system isn’t fully switched on.

We spend so much time optimizing what we eat: organic foods, perfect macros, nutrient diversity. But digestion is the gateway to nutrition. If the body isn’t prepared to receive a meal, absorption and metabolism cannot happen as efficiently.

What I know to be true is this: sometimes the most important part of nutrition isn’t what you eat. It’s how you eat.