(i) Usually the poorest section of the society are food insecure but sometimes people above the poverty line also become food insecure when the country faces a national disaster/calamity like earthquake, drought, flood, tsunami, widespread failure of crops causing famine, etc.
(ii) Due to a natural calamity such as drought total production of foodgrains decreases. It creates a shortage of food in the affected areas which eventually leads to price rise.
(iii) At the high prices, some people cannot afford to buy food. And if the situation prolongs it may cause starvation which can also turn into famine.