What happens to the food supply when their is a disaster?

When there is a disaster or calamity the production of food grains decrease. This in turn creates shortage of food in the affected areas. Due to the shortage of food, the prices go up. When the prices rise many people can not afford to buy food. Thus, the food security of many people is adversely affected because of disaster or calamity. If such calamity happens in a very wide spread area or continues for a long period of time, it may cause a situation of starvation. Massive starvation can result into a 'famine'.