"Called the “invisible killer,” chronic malnutrition isn’t necessarily a lack of food but a shortage of the right kind. Faced with insufficient nutrients, especially protein, the body compensates by simply stopping to grow. More importantly, brain capacity and productivity is reduced by as much as 40 percent. That can’t be recouped."
Chronic malnutrition in Guate is still a significant problem, especially for the indigenous populations living in the mountainous regions. This article also touches on how gender inequality plays a role in worsening the problem.