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From what I've learned revolutions are often accompanied by circumstances where people are desperate due to lack of basic necessities, especially food.
The French revolution was preceded by a serious food shortage. Remember that "let them eat cake" comment? One of the key events, the Women's March which displaced the king and queen from Versailles, was specifically motivated by demands for food.
The European People's Spring saw lots of revolutions across Europe in 1848-1849 including in France, Italy, Bavaria, Austria, Hungary. That was about the same time as a continent-wide grain shortage on top of an economic crisis.
The Russian revolution of 1917 came at a time when a combination of WW1, bad leadership, and an extra cold winter led to food shortages, and fuel shortages so people were starving and freezing at the same time.
For the Russian revolution you've also got that whole World War 1 thing where the rulers were expecting the freezing starving people to repeatedly bayonet charge machine gun positions with zeal and elan for years on end.
I think there was crazy inflation in some countries during the Arab Spring, too. Which also makes it hard to get food.