Children may contract infection from sandboxes contaminated with petsâ stool. Certain types of immature worms may penetrate through your skin during swimming or walking barefoot; when they reach the small or large intestine they grow into adult worms. Common garden worms usually do not cause illness in human.
People with lactose intolerance do not produce enough of the lactase enzyme to break down lactose. Instead, undigested lactose sits in the gut and gets broken down by bacteria, causing gas, bloating, stomach cramps, and diarrhea. Lactose intolerance is fairly common and seems to affect guys and girls equally.
By contrast, fats and proteins cause little gas (although certain proteins may intensify the odor of gas). Sugars The sugars that cause gas are raffinose, lactose, fructose, and sorbitol. 1  Raffinose â Beans contain large amounts of this complex sugar. 2  Lactose â Lactose is the natural sugar in milk. 3  Fructose â Fructose is naturally present in onions, artichokes, pears, and wheat.