Life expectancy refers to the average number of years a person can expect to live. Give the reason for shorter life expectancy of the poor?

There are numerous factors that influence the life expectancy, which is why there is such a big difference in the life expectancy between the most developed nations and the poorest nations in the world. The people living in the poorest nations in the world lack medical care. They often suffer from malnutrition and lack of water, or if they have water it is often not of good quality. The jobs that they are engaged in are dangerous, or the people are constantly working very long hours every day and are exposed to the outside conditions. All of this combined results in life expectancy that is 30-35 years lower than that in the most developed nations.