availability&influences
The circumstances under which food is grown and produced in are very specific and can be easily disrupted creating a lack of food amopungs cities, nations and sometimes worldwide.
geography & Climate
Enough food is produced in the world to feed everyone. In developing countries the amount of food produced is insufficient to feed the population, therefore they experience severe food shortages. in western developed countries, a large amount of food is wated and overproduced. Many areas around the world are unsuitable to produce crops. Worldwide climatic changes are likely to impact the global food security in many ways.
war
When war occurs and people are displaced, governments spend money on the military rather than food. During a war it is unsafe and often unsuitable for people to look after crops and cattle. As a result of it being unsafe, families may be forced to leave their farms and countries. In many cases, the small amount of food grown is given to men to provide energy for fighting, leaving little food for women and children.
Religious and Cultural Beliefs
Religious and cultural beliefs of a group may dictate the types of food available to them which may limit the amount and types of nutritious food which can be eaten. For example, Jewish and Muslim people don't eat pork. In addition both of these religions require fasting.