This popular image of the French Revolution, and revolutions in general, is almost completely false. The central issue that led to the French Revolution wasn’t declining living standards (though economic pressure was certainly relevant), but the French treasury going bankrupt and the resultant calling of the Estates General. Prosperous middle classes for example are generally a notoriously revolutionary bunch, and so are oppressed peoples and the proletariat. Economic pressure, up to and including starvation, is important, but it’s neither necessary nor sufficient for revolution to break out.

Edit: If I were to oversimplify the causes of the revolution beyond recognition to produce something as short as the starvation thesis, it’d probably be something like the Marxist thesis: The Ancien Regime’s fiscal crisis opened the way for the French bourgeoisie to demand political power, which they (to put it lightly) did. The big problem with this simplified explanation is that it only describes the first two months of the 5-25 year-long French Revolution (definitions vary), because the French Revolution is really fucking complicated.