One cup of rice a day. More than 800 million people in the world do not have enough to eat, according to the UN Food and Agriculture Organization. If all the world's undernourished people were gathered together, the population of the continent of the hungry would dwarf that of every other continent except Asia.
Hunger rises from extreme poverty, sometimes in conjunction with war and famine.
There are millions of children who grow up suffering, and dying, from the lack of the simplest food. I tried, while in India, to live on one cup of rice three times a day, so three times the criteria for hunger. Eventually, you train your body to desire less. Your stomach shrinks. Farther on, as you eat only a cup of rice a day, malnutrition sets in.