By Dr. Brian McDonoughSponsored By Independence Blue Cross

PHILADELPHIA (CBS) — Infection and undiagnosed diseases are two major reasons for death in underdeveloped countries, but they are not the biggest factors.

According to the World Health Organization, poor nutrition contributes to more than 50% of deaths worldwide.

READ MORE: Police: Man Shot 3 Times In Face, Killed In North Philadelphia

One out of two children in Africa with severe malnutrition dies during hospital treatment due to inappropriate care.

One out of four preschool children suffers from under-nutrition.

READ MORE: Funeral Services Held At Temple University's Liacouras Center For 12 Victims Killed In Fairmount Fire

This can seriously affect a child’s mental and physical development. One of the biggest issues is vitamin deficiency.

A third of people in developing countries are affected. As a result, they’re more subject to infection, birth defects, even impaired physical and psychological development.

MORE NEWS: Police Investigating Stickers Advocating White Supremacy Found On Signs Along Several Streets On Main Line

These issues are critical, and they just cannot be ignored anymore.