Maria Planchart has had to go through trash to find food for her one-year-old son, Jean Pierre. She is among a growing number of Venezuelans suffering from hunger and malnutrition. Photo: Miguel Gutiérrez for The Wall Street Journal YARE, Venezuela—Jean Pierre Planchart, a year old, has the drawn face of an old man and a cry that is little more than a whimper. His ribs show through his skin. He weighs just 11 pounds. His mother, Maria Planchart, tried to feed him what she could find combing through the trash—scraps of chicken or potato. She finally took him to a hospital…