New York Times journalist Jane Brody suggests that eating dirt is an instinctive behavior in humans. In her article, Eating dirt can be good for you – just ask babies, she interviewed researchers who think 
people should eat dirt in order to stimulate their immune system. Brody says that immune system disorders such as asthma and allergies have risen significantly in the United States.
Although allergies do appear to be on the rise, the awareness of allergies, the ability to diagnose allergies, and the number of people at risk (the U.S. population) have also risen significantly.
The director of gastroenterology and hepatology at Tufts Medical Center in Boston, Dr. Joel Weinstock, said in the interview,
"There are very few diseases that people get from worms. Humans have adapted to the presence of most of them. … Children should be allowed to go barefoot in the dirt, play in the dirt, and not have to wash their hands when they come in to eat…let kids have two dogs and a cat, which will expose them to intestinal worms that can promote a healthy immune system.”
Dr. Weinstock, I’m sure glad you aren’t my doctor.
I agree that immune systems are naturally stimulated by various exposures to the environment, and that Americans use too many antibacterial products, but I question Dr. Weinstock’s knowledge of zoonotic diseases. Intestinal parasites from animals that infect humans, since many are not adapted to humans, often leave the intestines and migrate through the body. There are approximately 10,000 human cases of larva migrans in the U.S. each year. Unfortunately, most of these cases are in children, and a few of these kids die.
Eating dirt is an instinct? Not for me. Babies eat dirt because they don’t know better. Some may think that bad behavior is an instinct, but calling bad behavior an instinct doesn’t excuse it. Bad advice shouldn’t be excused either.
Dirt may have poop in it, so don’t eat it.
