These were Asian influenza of 1957 CE and Hong Kong influenza of 1968 CE.
75 Why scholars like Amartya Sen and others say that it is not necessary that famines occur only in the state of fall in food grain production?
It is because famines may also cause by a failure of entitlements or inability of people to buy or otherwise obtain food. A number of people in the world die of hunger and starvation due to poverty.