Samuel is a 63-year-old single man who works full time in a food processing plant. He has a history of esophageal cancer, which was treated successfully with anti-cancer drugs and surgery four years ago. His weight had been stable at 135 pounds until the past 6 months, in which he has experienced an involuntary weight loss of 10 pounds. He is 67 inches tall and his current BMI is 19.5. He complains of a poor appetite and being overly weak and tired. He also complains of cracks at the corners of his mouth and a chronic sore throat which concerns him, given his cancer history. His usual diet is fairly consistent. He states that he rarely eats breakfast because he starts work at 6 a. m. He eats two deli meat sandwiches, "usually pastrami or salami," and a soda at 10 a. m., and may eat a candy bar in the afternoon when he gets off work. He often prepares frozen dinners or pizza at home in the evening and routinely drinks "about 4 or 5 beers" before going to bed. Occasionally he will cook a roast and mashed potatoes. He occasionally will have milk with cereal but rarely eats vegetables or fruit. He would like to know which vitamin supplement will give him energy?