Undernourishment or Chronic Hunger
"The average minimum energy requirement per person is about 1800 kcal per day." http://www.fao.org/hunger/en/
How much food do you need?
"On average, the body needs more than 2,100 kilocalories per day per person to allow a normal, healthy life." http://www.wfp.org/hunger/what-is
According to the World Health Organization, a diet under 2100 calories for average men and under 1800 calories for average women is classified as a “Starvation diet.” http://hbmag.com/the-calorie-myth/