In the developed world breast feeding may not however be protective against the common cold in and of itself.
For a long time, breastfeeding was thought to be protective against later obesity.
For example, tobacco was supposed to be protective against the ravages of the Plague.
Even if researchers eventually find hormone therapy protective against heart disease, it may not be used again solely for that purpose.
Ozone at high regions is protective against dangerous ultraviolet radiation.
In other words, breast milk appears to be at least partly protective against the effects of toxic chemicals.
However, he said, these nutrients may be protective against other types of cancers, as some research has suggested.
It may be protective against liver damage caused by aflatoxins.
Of course, despite these issues women, the female gender as a whole is protective against coronary artery disease.
A cautious intruder is protective against discovery of his or her location.