How chewing may improve digestion, mood and cognitive function

It is widely known that chewing food properly improves digestion. However, research suggests it may also support brain function, improve memory, and potentially reduce the risk of cognitive decline such as Alzheimer’s disease.

Historically, some figures strongly advocated for excessive chewing. One of the most famous was Horace Fletcher, an American nutritionist known as “The Great Masticator.” He believed food should be chewed until it becomes almost liquid before swallowing. Although his claims were extreme, modern science shows that chewing does play an important role in digestion and overall health.

Experts now agree that while Fletcher’s ideas were exaggerated, the core concept that chewing matters was not entirely wrong.

Chewing more food may improve digestion, help regulate calorie intake, reduce stress, support attention, and possibly contribute to brain health. Some researchers also note a connection between oral health and cognitive conditions such as dementia, suggesting that maintaining good dental function may be more important than previously thought.

The evolution of chewing

Humans have had teeth and jaws for millions of years, but their structure has changed significantly over time.

Early human ancestors had teeth similar to those of modern apes, suited for eating soft fruits found in forest environments. As environments changed to include tougher foods such as seeds, nuts and roots, human jaws and teeth evolved to handle more mechanical stress.

With the development of tools, cooking and agriculture, humans gradually began processing food before eating it. As a result, the need for long chewing sessions decreased. Today, humans spend far less time chewing compared to other primates.

Despite these changes, the purpose of chewing remains the same. It is a key step in extracting energy from food to support the body’s metabolic needs.

Why chewing is the first stage of digestion

Chewing is the beginning of the digestive process. It breaks food into smaller particles and mixes it with saliva, making it easier to swallow.

Saliva contains enzymes that begin breaking down carbohydrates. Chewing also signals the stomach and pancreas to prepare digestive fluids.

When food is not chewed properly, the digestive system receives larger particles that are harder to process. This can lead to discomfort, bloating and slower digestion.

Smaller food particles also increase surface area, allowing digestive enzymes to work more efficiently.

Digestion, bloating and gut discomfort

Poor chewing can contribute to digestive issues such as bloating and gas. Larger food particles remain in the digestive tract for longer periods, allowing gut bacteria more time to ferment them.

This fermentation process produces gas, which may lead to discomfort, fullness or constipation in some individuals.

Nutrient absorption and fullness

Chewing food more thoroughly may improve nutrient absorption. Studies have shown that when food is chewed longer, the body can extract more energy from it.

In one controlled study involving almonds, participants who chewed more thoroughly excreted less fat, suggesting improved absorption of nutrients.

Chewing also affects satiety. Longer chewing time can increase feelings of fullness and reduce hunger. This is linked to hormones that regulate appetite, including those that signal fullness and reduce hunger stimulation.

Because it takes time for the body to register fullness, slower eating helps prevent overeating.

Chewing and eating speed

Eating slowly is strongly associated with better appetite control. People who chew more tend to eat less overall because they give the body enough time to signal fullness.

Research has also shown that people who eat quickly are more likely to consume excess calories before feeling satisfied.

Choosing solid foods over liquids and eating foods with more texture can naturally slow down eating speed and improve satiety.

Chewing and brain health

Recent research suggests a link between chewing ability and brain function. This has led to growing interest in what some researchers describe as the connection between oral function and brain health.

Some studies show that people with better chewing ability tend to perform better in memory and cognitive tests. Tooth loss and poor chewing ability have also been associated with higher risk of cognitive decline.

One theory suggests that chewing increases blood flow to the brain, supporting mental performance. Another suggests that chewing stimulates neural pathways connected to memory regions in the brain.

Researchers are continuing to study whether improving dental health and chewing ability can support brain function in older adults.

Attention, alertness and stress

Chewing has also been linked to improved alertness and concentration in short term tasks. Some studies show that gum chewing may slightly improve focus during demanding mental activities.

There is also evidence that chewing may help reduce stress levels. In several experiments, participants who chewed gum reported lower anxiety and reduced stress markers during challenging situations.

However, findings are not consistent across all studies. Some research shows minimal or no effect on anxiety, suggesting that the psychological impact of chewing may vary between individuals.

The calming effect of chewing

Outside laboratory settings, many people naturally chew during stressful moments. This may be linked to repetitive jaw movement, which can have a calming effect for some individuals.

Chewing may also enhance mood through sensory experience. The combination of taste, texture and aroma during eating can contribute to emotional satisfaction and relaxation.

Conclusion

Chewing is more than a mechanical process of breaking down food. It plays a role in digestion, nutrient absorption, appetite control and possibly even brain health.

While chewing is not a cure for cognitive decline or stress, evidence suggests it supports several aspects of physical and mental well-being.

The key takeaway from research is simple: eating slowly and chewing properly may improve digestion, help control food intake and support overall health.