Lets examine the issue of world hunger with a little more detail before circling back around to that...
There is a new scale for measuring "food security" that classifies such problems according to severity for a finer/better categorization of a problem than just saying "famine"
*:
(1) Generally Food Secure
(2) Moderately/Borderline Food Insecure
(3) Acute Food and Livelihood Crisis
(4) Humanitarian Emergency
(5) Famine/Humanitarian Catastrophe
http://www.ipcinfo.org/overview.php
http://www.ipcinfo.org/attachments/ReferenceTableEN.pdf
*Commentary: IMO, the very existence of such a scale is evidence to me of how
small of a problem hunger has become in the world. We take a proactive stance and address risk today rather than waiting for famines to happen in most cases. The wiki listing famines cites the 1984-85 Ethiopia famine as a major motivator that has caused the Western world to choose to stop/prevent later famines when food aid (money) alone (as opposed to military force) is capable of doing it.
Here's Wikipedia list of famines in chronological order:
http://en.wikipedia.org/wiki/List_of_famines
The first thing one notices is that in the past 10 years, there have only been two "famines", but a number of "food crises".
For example, the 2006 Horn of Africa Food Crisis:
http://en.wikipedia.org/wiki/2006_Horn_of_Africa_food_crisis
The details are sparse, but the wiki says that several million people were affected, requiring food aid, and 30 (yes,
thirty) died. That this event was severe enough to get on the list and have a wiki page associated with it is, to me, a testament to how far we've come in eliminating starvation in the world. Let's look at some actual famines, though:
2011 Horn of Africa Famine:
http://en.wikipedia.org/wiki/2011_Horn_of_Africa_drought
This one is ongoing, so the numbers aren't final, but it has killed something like 29,000 children in Somalia. Somalia. Somalia. Looking at the map in the wiki, what separates the "famine" regions from those in "crisis" and "emergency" situations is a line on the map, ie the border between Somalia and Kenya. Somalia has no functioning government, only local warlords (small-time dictators). So quite literally, what separates a food crisis/emergency from a famine in this case is a [or several] dictator
.
Other recent famines:
2003 Sudan/Darfur
1998-2004 Congo
1998-2000 Etheopia
1998 Sudan
1996 North Korea
1991-2 Somalia
Now looking through this list, I find that I need to qualify my statement about dictators somewhat. Only one (North Korea) was specifically caused by a traditional dictator. The rest involve war or anarchy type situations. The effect, however, is similar and the point really hasn't changed in a substantive way: violent political problems cause or worsen food production/distribution problems and thwart aid efforts. But as I said, functionally there isn't much difference between a local warlord and a dictator.
Looking through the list further back, it appears to me that the last famine to occur without a war or indifferent dictator being a large contributer to the cause or worsening of it was Ethiopia in 1973.
So:
There are many countries in Africa and a small handful outside of Africa that live perpetually on the edge of a food crisis. A cyclical drought of the type that one sees every few years in a great many countries is enough to tip the food supply from barely adequate to woefully inadequate, risking famine in poor countries. But in today's world, actual famines only happen when bad/violent political situations thwart aid efforts to stop/prevent them.
Circling back to the OP, as I and others have said, there is no global food shortage requiring a change in diet to deal with. But expanding, there are many countries "at risk". I would say that like an illness, there are two timeframes of food security problems: acute and chronic.
Acute hunger problems in the world today are all caused by natural disasters or wars and all are stopped/prevented by the West unless thwarted by dictators of some flavor. And that's the way it needs to be: when a drought or flood happens, some countries become physically unable to produce their own food and thus the only way to stop/prevent a famine is for us to go do it. And we do because we choose to.
Chronic hunger problems aren't about not having enough food in the world either, but rather are about having the stability and uniformity of wealth to get everyone the food they need. Every country in the world has such problems to one degree or another (though I suspect it might anger an African if you tell him that 14.5% of Americans have food insecurity problems). IMO, shipping tractors to Ethiopia isn't the answer. A tractor does nothing for you if there is a drought so it doesn't help prevent famines, nor does it provide uniform distribution to poor villagers who can't buy the food produced by the tractor. Now I realize that the tractor is just a simplistic exmple like my dictator example was simplistic, but what I'm getting at is that there are really only two ways to deal with long-term food insecurity:
1. Long term aid. By this I mean we in the West continuously pour tons of money, food, seed, equipment, etc into poor countries as a sort of long-term welfare relationship.
2. Develop poor countries politically and economically so they can deal with their own emergencies and long term poverty issues.
Currently, we do #1. It won't/can't ever be enough. There are just too many people and it costs too much money for us to prop them all up and as others have said, a lot of that money will always be wasted/stolen due to bad political situations in countries we are trying to help. But as I said, we do stop/prevent actual famines and put some money into the chronic needy and IMO, that's good enough: that's as far as I think our moral duty extends. #2 has to happen largely on its own (more on that later).
For war/dictator-caused famines, we can either do nothing about them or we can impose short term aid or long term political change by military force. In 1991 we tried a halfhearted combination of both in Somalia and ultimately decided that 300,000 dead Somalis were not worth 19 dead Americans, so we quit and left - and have done virtually nothing since in similar situations (See: Darfur, 2003). The amount we care about starving and oppressed people in the world has increased to the point where now we're willing to give money and prevent famines when people want our help, but we're not yet willing to give [many] lives to force people to accept our help. Is that the right thing to do? [shrug] Dunno.
So to answer your question more directly, Ryan: When there's a famine, in today's world, there's always a dictator/warlord/tribal chieftain behind it. That's a historical fact of the last 38 years. But expanding the scope of the issue to general food security problems, I agree with ThomasT's two points that aid does not truly fix long term problems and even as a long-term prop-up, much is wasted/stolen by such local dictators. Because major food security problems go hand in hand with political problems, the only way to "make sure that your aid is well spent" in most cases is to have an army follow it around. And we do that in a lot of cases, which is fine, but it's not a solution to the underlying problem. And sure, you can apply political pressure and put conditions on your aid, but that tends to take the form of simply pulling the aid if the conditions aren't met (North Korea) or if the military cost required to ensure it gets where it needs to go is too high (Somalia). Our ability to actually ensure that it goes where it needs to via political pressure is highly limited and most of the famine deaths in the world in the past 20 years happened because political pressure couldn't get it where it needed to go and we declined to use the military force required.
Beyond that, my personal opinion is that because political/economic change is required to truly fix the food security problems rather than just temporarily abating them with aid over and over again, we shouldn't be giving aid except in cases of true acute need. By repeatedly temporarily relieving the problems, we create a dependency: Since a country that is receiving aid doesn't have a food security problem because it has been temporarily abated, there is no incentive to fix the underlying cause. This is the basis of my moral and logical objection to welfare, as it is currently practiced in the West, in general.
If anyone finds this cold, consider the other side of the coin: utilizing/witholding food aid to coerce political change both morally wrong and practically pointless, in my opinion. Because cancelling aid is a negative act whereas a bomb is a positive act, withdrawing aid as a form of coercion is slightly less morally wrong than purposely dropping a bomb on a civilian population, but it is equally as futile. Both acts use a weapon to harm civilians in the hope that the fallout coerces political change from the government. That's dangerously close to the definition of terrorism. From a practical point of view, if the local warlord is the one handing out the food and you pull the food aid to try to coerce the warlord to have an election, who will the peasant get more mad at? Is it the guy that just handed out the bag of rice or the guy who now won't give him another bag to hand out? By using the aid as a coercive force, we're using dictator tactics without the ability to reach the people directly to convince them of who is the worse dictator.
War is morally superior to using food aid as a coercive weapon because instead of aiming the weapon at the suffering civilians, we're aiming the weapon at the person oppressing them.
So I am against food aid with conditions attached. I think when we give aid it should be unconditional, but due to the moral and practical problems associated with long-term, coercive aid (even if it is only moderately coercive), we shouldn't do give it. Perhaps that's beyond what you meant by "make sure that your aid is spent well", but I think the issue is far bigger/more complicated than that anyway.