Just open any newspaper from 20-30-40 years ago, you will see a picture of a world full of conflicts and disorder everywhere.
This being said, I do believe there are "triggers" that may help people to riot, and the price of food may be one. By the way, food pricing and "hunger" are two different things. Noone was suffering from Hunger in Egypt when they rioted. Let's call a cat a cat. I love when people write about "Hunger" while they live in a world where noone around them have experienced hunger once in their lives. Don't USE words you do NOT understand.
And this article is BS anyway, since the author throws some global warming salt together with some "evil speculators" pepper. Making a link between drought and global warming, maybe, without any clear explanation ? Droughts have ALWAYS happened in History, even when we did not produce carbon. Strange huh ?
The intensity of the Egyptian riots is very much connected to general poverty and food scarcity in large parts of Egypt, though not uniformaly. Cairo is a different circumstance. None the less, your point is incorrect.
You see riots, demonstrations in western countries when prices for petrol or commodities rise, but that does not mean that the situation is necessarily unbearable.
By the way, price food increase has also a lot to do with the US government debt and the weakness of the US dollar (inflation) leading to increasing $ needed to buy the same amount of food over time. And poorer countries are directly impacted by this.
Riots are when masses 'give up' and resort to something else.
Needless to say the entire western world is very far away from it.
Occupy protests are not riots despite all the police in riot suits standing around sweating.