When your stomach rumbles before you even smell food, that's your gut and brain having a quick chat. They talk back and forth all day long, telling each other things like "I'm hungry" or "I'm full" and keeping digestion running smoothly. But when that conversation breaks down, the results can be painful — chronic nausea, bloating, and stomach pain that millions of people know all too well.

Now, engineers at Lehigh University in Bethlehem, Pennsylvania have built something that could help. They've created one of the first computer models, called a digital twin, that simulates how the gut and brain talk to each other to control stomach function. Think of it as a virtual stomach — a mathematical model that researchers can use to test ideas without doing experiments on animals or people right away.

"Our digital twin is like a virtual stomach that helps us understand what happens when signaling is disrupted and why," said lead author Shannon Q. Fernandes, who earned her Ph.D. from Lehigh in 2026 and now works as a research scientist at AbbVie, a drug company. "Ultimately, it could help researchers develop more effective neural stimulation therapies."

The model, published in the journal Frontiers in Physiology, maps out the electrical signals that travel along nerves between the brain and gut. It focuses especially on a key highway called the vagus nerve, which carries messages in both directions. When this communication line gets fuzzy, people can develop what doctors call disorders of gut-brain interaction — conditions like irritable bowel syndrome, gastroparesis, and functional dyspepsia.

Here's a striking number: the National Institutes of Health estimates that up to 40 percent of adults worldwide experience at least one of these disorders. Yet current treatments often provide only limited relief.

That's where the digital twin comes in. Instead of jumping straight into expensive and time-consuming animal studies or human trials, researchers could test different electrical stimulation strategies on the computer first. By delivering carefully controlled electrical impulses through the vagus nerve, scientists hope to restore healthy signaling patterns — essentially teaching the gut-brain conversation to flow smoothly again.

"If you have a digital twin that accurately represents the biological system, you can test different strategies virtually before moving into experiments," said Mayuresh Kothare, a professor of chemical and biomolecular engineering at Lehigh who co-authored the study. "Models like ours help researchers focus on the approaches most likely to succeed while reducing the number of experiments needed."

This growing field is called bioelectronic medicine. The idea is to treat disease by using targeted electrical stimulation of peripheral nerves, kind of like how a pacemaker regulates a heartbeat. Kothare and his team are now exploring how to use their model to design better devices that could one day help patients suffering from chronic digestive disorders find real relief.