Also, vitamin D deficiency may play a role in reduced immune function and an increased risk of cancer (22). (healthline.com)
Getting enough iron also keeps your immune system healthy and ready to fend off pathogens, while iron deficiency puts you at risk of infection by reducing immune function. (healthyeating.sfgate.com)
Importantly, diminished condition was carried over into the adult stage, as evidenced by a strongly reduced immune function and partly reduced storage reserves. (jeb.biologists.org)