New research says 35 percent of the deaths of children worldwide are caused by hunger. The research is from poor to middle-income countries in Africa, Asia and Latin America.  Robert Black from the Bloomberg School of Public Health at Johns Hopkins University in prefix = st1 /Marylandwas the leading writer of the research. He says more than 3.5 million mothers and children under five die in poor countries each year because of hunger.  He says more than two million children die from underdevelopment, either before or after birth. Millions of others who survive face a lifetime of disabilities or early death. And the effects are not just physical. Poor brain development can limit economic success as children become adults. Then the cycle of poverty and hunger often repeats for their children.  Doctor Black says hungry children are also more likely to have conditions like high blood pressure and heart disease as adults. He says the studies show that food programs need to place the greatest importance on the first two years of life. Hungry children can suffer the whole life damage from age two.  So it is high time to improve their diets. Diets should include foods rich in vitamin A and other useful things. The researchers say early help like these could reduce child deaths by 25%.  The research has faced some criticism . A medical aid group says the researchers underestimate the number of child deaths from hunger. The researchers say there are findings that support this treatment but more studies are needed to compare it to hospital care. Which of the following is the most suitable title for this passage?
Hunger--children's biggest enemy. How to prevent hunger. A latest survey about hunger all over the world. Time to improve our living conditions.