food insecurity          
noun [ U ] uk/ˌfuːd.ɪn.sɪˈkjʊə.rə.ti/ us/ˌfuːd.ˌɪn.səˈkjʊr.ə.t̬i/
 粮食不足,三餐不济
the fact that a person or family is not always able to get enough food
  13 million American children live in households suffering from hunger or food insecurity.  1300万美国儿童生活在饥饿或粮食不足的家庭里。 
  粮食生产不足
the fact that a place may not be able to produce or obtain enough food to feed its population
  The organization recently produced a report on world food insecurity. 该组织最近撰写了一份有关世界粮食生产不足状况的报告。 
 - More examples
 - The federal report showed that households with children reported food insecurity at more than double the rate for households without children.
 - The food insecurity category includes families who may be at imminent risk of going hungry or who are stretching their food budgets to the point where nutrition is suffering.
 - Aid agencies recently launched a five-year effort to address some of the root causes of food insecurity.
 - He believes that genetically modified plants are crucial at a time of growing food insecurity.