Digestion begins in the mouth

Why Chewing Is Your Secret Weapon

In the hunt for fast carbohydrates, we've forgotten something essential: human physiology is designed for chewing. The rise of liquid gels has led to the suggestion that we can "skip" digestion. But ignoring the digestive process is ignoring the efficiency of our own engines.

The Starting Shot: The Cephalic Phase

Digestion is an active collaboration between your jaws and your brain. Peyron et al.'s (2017) review highlights the link between chewing and digestion: "Mastication (chewing) is a powerful sensory stimulus that regulates the release of gastric juices and pancreatic enzymes via the vagus nerve. This prepares the gastrointestinal tract for optimal absorption." Chewing provides the neurological cue to open the digestive doors before the first bite arrives; your digestive system is primed, accelerating absorption.

Stable glucose and the 'brain axis'

Research by Korpela et al. (2020) confirms that the physical act of eating improves the sugar response: "Oral processing increases early insulin secretion, which is crucial for maintaining glucose homeostasis." Chewing helps your body process sugars more steadily; you prevent an aggressive spike because your pancreas immediately releases the appropriate amount of insulin. Furthermore, this mechanical pressure is associated with the activation of brain areas for focus and stress regulation, which keeps you mentally sharper during the ride.

The Neglected Machine: Oral Health

Not chewing has direct consequences for your teeth. A recent review by Hrubša et al. (2022) emphasizes the protective role of saliva: "The mechanical stimulation of chewing significantly increases salivary flow, which is essential for neutralizing acids and remineralizing enamel." - When you don't chew, you produce less saliva to wash away sugars. Your teeth are therefore "surrounded" by acids without activating your own cleaning system. Chewing solid food mechanically cleans your teeth and stimulates blood flow to your gums.

The Mechanical Rest: Motility and Matrix

According to the standard Guyton and Hall Textbook of Medical Physiology, the physical form of food is crucial for intestinal rest: "The presence of solid food and the act of chewing stimulate motility (the movement of the gastrointestinal tract) in a way that regulates the passage of glucose into the small intestine." Chewing acts as a natural valve, gradually releasing energy; this significantly reduces osmotic stress and lessens the risk of the infamous sloshing sensation and stomach cramps during exercise.

Your strategy: From swallowing to feeding

The science is clear: your body expects texture. For the serious athlete, this means:

Activate your system: Eat solid food during workouts to keep your digestion and brain switched on.
Protect your teeth: Alternate gels with solid Bites to stimulate saliva flow and prevent erosion.
Find the Flow: Work with your physiology instead of overwhelming it. A calm stomach and sharp focus are the foundations of the state where everything seems to flow naturally.

Citation

Peyron, M.A., et al. (2017). Mastication and Its Influence on Human Health. [Frontiers in Physiology.]
Korpela, R., et al. (2020). Oral processing and the glycemic response. [Nutrients.]
Hall, J.E., & Hall, M.E. (2020). Guyton and Hall Textbook of Medical Physiology (14th ed.). [Elsevier.]
Hrubša, M., et al. (2022). Biological Role of Mastication in Oral Health. [Nutrients.]