Fueled by a high-calorie diet, detainees at Guantanamo Bay are becoming fat. Most of the prisoners arrived at the military prison in southeast Cuba slightly underweight but have since gained an average of 20 pounds (9 kilograms), and most are now "normal to mildly overweight or mildly obese," Navy Cmdr. Robert Durand, spokesman for the detention facilities, said Monday. One detainee's weight has almost doubled to 410 pounds (186 kilograms), Durand said. U.S. officials assess whether detainees are overweight by calculating their body-mass index, a measurement of weight in relation to height. Human rights groups attribute the weight gain to...