It is theoretically possible for stool to move through the gut without producing any gas, but it would require some unusual circumstances. Here’s why:

1. Intestinal gas comes from two main sources: swallowed air and bacterial fermentation. Swallowed air can enter the digestive system through eating, drinking, or breathing, and it can accumulate in the stomach and small intestine. Bacterial fermentation occurs when microbes in the large intestine break down certain nutrients, such as fiber, and release gases like hydrogen, methane, and carbon dioxide.
2. When food enters the stomach, it gets mixed with digestive enzymes and acids that help break it down into smaller molecules. The mixture then passes into the small intestine, where most of the nutrient absorption takes place. As the food travels through the small intestine, it’s squeezed and mixed with digestive juices, which helps to break down the remaining particles and absorb more nutrients.
3. Now, here’s where things get interesting. The movement of food through the small intestine creates pressure waves that propagate backwards, towards the stomach. These pressure waves can cause some gas to be pushed ahead of the food bolus (the ball of food moving through the intestine), reducing the likelihood of gas buildup behind it. This phenomenon is known as “propagation of pressure waves” or “peristalsis.”
4. However, even with efficient peristalsis, some gas will still be left behind in the intestine. To eliminate gas completely, you’d need a scenario where the following conditions are met:

a. Minimal swallowing of air: You’d need to eat and drink slowly, chewing your food thoroughly, and avoid carbonated drinks or sucking on hard candies, which can introduce excess air into the digestive system.

b. No bacterial fermentation: This means having a sterile gut environment, devoid of the usual bacteria that inhabit the large intestine. While not impossible, maintaining a completely sterile gut is challenging, as bacteria are ubiquitous in our environment and can easily colonize the gut.

c. Efficient mixing and propulsion: The digestive system needs to mix the food thoroughly and efficiently propel it through the intestine, ensuring that minimal gas is left behind. A healthy, functioning digestive system should be able to achieve this.

5. If all these conditions are met, it’s theoretically possible to pass stool through the gut without expelling gas. However, it’s essential to note that complete elimination of gas production is unlikely, as some amount of swallowed air or bacterial fermentation is almost always present. Additionally, even if gas doesn’t exit through the anus, it may still be released through other routes, such as belching or burping.