When there is a disaster or a calamity like earthquake, flood, drought, tsunami, wide-spread failure of crops that causes famine, then:

1. Food supply declines because of the less availability of grain.

2. Food requirement increases because many people are ailing or hurt owing to the calamities.

3. To supply the food grains buffer stocks are used.

4. The victims have to rely on government support and relief programs to make the ends meet.