Why do hunger and malnutrition exist?

There is enough food to feed the world, so it is not a question of scarcity. Politics, economy and ideology are all at the very bottom of the structural causes that determine hunger and malnutrition around the globe. In other words, the inadequate intake of food of a family or a whole society may be the result of one or various reasons such as land distribution, income, sex and gender identity, discrimination based on race and ethnicity, to mention just a few.