"Smelly odor is not bad, it's just a function of what you're eating and what your bacteria is doing inside your gastrointestinal tract. Everyone is different," Dr. Brand explains. "Foul smell just means the carbohydrates you consume are being malabsorbed -- it's fermented."
Ironically, the healthier the food you eat, the worse the smell. Fiber-rich foods, such as broccoli, Brussels sprouts, and quinoa, boost gut bacteria, and in return cause you to naturally pass gas. Foods with high sulfur composition, such as red meat, milk, or plant-based proteins, are the culprits of producing the foul odor. When we feed the bacteria in our gut high-protein foods, they produce a sulfur gas, which makes your farts noxious, says Dr. Brand.
"The end product of fermentation in our gastrointestinal tract is gas -- carbon dioxide, hydrogen, or methane. And it's all made from bacteria fermentation."
But hey, it's a small price to pay for being healthy… or is it?
So what's with the rotten egg smell? That sounds like something to be alarmed about.
When the bacteria in your gut break down all that food into hydrogen sulfide, then you produce that ghastly rotten egg fart smell.