There was nothing left to eat.
The butter had disappeared in October. By November, adult food rations had been cut to 1000 calories per day. A few months later, in the dead of winter, rations dropped to 500 calories per day. Food stocks throughout the country were empty. If you were lucky enough to have food ration coupons, you could get 100 grams of cheese every two weeks. Meat was a fantasy. By April of 1945, each person was limited to 1 loaf of bread and 5 potatoes — for the entire week. 
It was the middle of a terrible famine known as the Dutch Hunger Winter. World War II was nearing an end and Allied forces were able to push the German army out of the southern half of the Netherlands. As the Nazi’s retreated, however, they destroyed docks and bridges, flooded the farm lands, and set up blockades in the northern half of the country to cut off shipments of food and fuel. What little food had been stockpiled and saved was nearly impossible to transport. Starving and without options, many people ate tulip bulbs and sugar beets.
Among those struggling to survive was a 9-year-old boy from Amsterdam named Henkie Holvast. During the worst period of the famine, Henkie was one of the many children who would carry spoons with them wherever they went “just in case.” Photographer Martinus Meijboom captured this iconic image of Henkie during the Dutch Hunger Winter. Two of Henkie’s younger siblings died during the famine. Somehow, he managed to survive.
Source: National Institute for War Documentation, Amsterdam
To make matters worse, winter had come early that year. Canals and waterways had frozen, further restricting food transport. Gas and electricity were either unavailable or inoperable because of the war. The Holvast family, like many others throughout the Netherlands, had begun burning their furniture to stay warm. By April 1945, the situation was desperate. Approximately 20,000 Dutch had died from malnutrition.
In April 1945, the Royal Air Force flew from Great Britain and coordinated a series of air drops known as Operation Manna. In total, they dropped more than 6,600 tons of food in German-occupied territory. The Dutch responded with a simple message of “MANY THANKS” written in tulips on the countryside.