Dirt for immune is beneficial, especially for children. When people introduced to bacterias from little age, they develop stronger immune system compared with those who live in sterile households.
Healthy Children Become Healthy Adults
Did you ever think about the health of your parents and grandparents? Most of them were and are firm and do not have so many allergies to cats, dust or pollen. Why does it happen? A few decades ago people were not so crazy about sanitary conditions. They ate apples from trees or picked from the ground. Nobody washed strawberries or vegetables. The visible dirt was removed and it all. They ate it without consequences.
In cities, people got more problems compared with the countryside. However, children who had contacts with dogs and played with dirt anywhere developed a stronger immune system compared with well-being that it is now.
Dirt For Immune System Is Good
Having contact with the dirt keeps immune system stronger. The immune system can adapt. When it exposed to various microorganisms, the immune system becomes stronger. Especially children benefit from it. Exposure to farm animals and multiple plants reduces risk to become allergic.
Authors of Dirt Is Good recommends parents to let children play in the dirt. I can imagine how it can be scary for moms who carry special napkins to protect children from germs.
The sterile environment is suitable for labs, not for real world. To prepare for various encounters of germs immune system must be ready to it.
The immune system develops protective mechanism during the lifetime. Especially it is important for children. Here is an excerpt from the book Dirt Is Good written by Jack Gilbert, Ph.D., and Rob Knight, Ph.D.:
One way to ensure that your baby or toddler will be able to control inflammation is to expose them to a diverse bacterial world. This exposure trains their immune system to identify self versus nonself, and it also increases the chance that they’ll have bacteria that help keep inflammation in check.
Living in the world which exposes you to various bacterias is helpful for the immune system. Children benefit most. The immune system expects microbes to come in. Having them around, children get stronger because the immune system develops continuously. The clean air, contacts with farm animals and soil can help build robust immune system. It works for adults too.