A few weeks ago, Soliman Zyad, a young health-care worker in northern Gaza, told me that his family was near starvation. On some days, he and his uncle AbdulKareem walked in search of food from 3 A.M. until the afternoon. “We swore we would not return home without finding flour,” Zyad told me. “People were ready to risk their lives for a single sack.” Almost forty per cent of the population was going days at a time without eating, according to the World Health Organization. Sometimes AbdulKareem would vomit from hunger and fatigue. His wife, pregnant with twins, was severely...