What causes poverty in developing countries?
Well, I'll try to boil down to a brief argument. Developing countries lack of resources, including medical technology, sense of hygiene, preventive services, social services, and very restricted economic development. The thing is, the majority of the devloping countries is governed under oligarchy, arbitrary, and totalitarian regime, such as North Korea, most African countries, as well as China.
The developing countries are mostly isolated from the rest of the world, and the reclusive restraint hinders them from receiving international aid as well as exchange of knowledge.
North Koreans have no idea what the outside world is like, because the government even bans the use of cell phone, not to mention that the citizens in North Korea couldn't picture the freedom of rights in any form.
The Chinese have been experiencing booming economy over the years, and prosperity is the scheme the arbitrary government employs to keep the people's mouth shut and defer to the dictatorship.
Since the developing countries cannot advance technology, the amount of agricultural as well a manufacturing production will be curtailed. So the supply is always inproportionate to the population demand. That's how famine and emaciation occur in these developing countries.
Also, the access to reach higher social status is rather challenging for rank-and-file citizens in the developing countries. Therefore, inequality and widening gap between the affluents and the impoverished saturate in these countries as well. Like in Saudi Arabia, Egypt, and these countries in Africa with the world's most petroleum preservation are dominated by the extreme wealthy individuals, while there are still great numbers of starvation below the horizon.
It's really hard to ameliorate the current predicament in these countries, because they are dominated by arbitrary regimes that suppress people from repelling against the government and calling for freedom. When people learn to defer to the totalitarian regimes, the contingency is that they will learn to accept the current status quo, without struggling for a change.
Basically, confinement in the deveopoing countries is what accounts for poverty, which is often accompanied by famine and starvation. I hope this answers to your puzzle. I know that I've done a lousy job in generalizing my standpoint in a nutshell. May be I'm talkative.