Well, honey, it's all in the genes! Guatemalans tend to be shorter on average due to a combination of factors like genetics, nutrition, and overall health care. So, it's not that they're "short," they're just vertically challenged in comparison to some other populations.
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In order to grow tall, people need carbohydrates, proteins, fats, and vitamins. The excess of corn in the Guatemalan diet lacks the necessary protein, fat, and vitamins. The outside and inside of a human cell is made of fat. Without adequate fat in the diet, a human child can not produce the cells required to grow tall. Cells require proteins and vitamins to function.
When Guatemalan children become illegal aliens in the United States and start receiving an adequate diet, they grow as tall as everyone else. As long as los banditos roam unchecked through the Guatemalan countryside life unsafe, the people will not be able to grow crops providing well balanced diets.