What causes farts to smell?
YOU. You have the power to control your own gruesome odor by what you eat -- not all farts are created equal. Some smell like bitter alcohol, others smell like three-month-old expired broccoli, and many smell like the aforementioned rotten eggs.
"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.