Meats were more expensive than plant foods. Though rich in protein, the calorie-to-weight ratio of meat was less than that of plant food. Meat could be up to four times as expensive as bread. Fish was up to 16 times as costly, and was expensive even for coastal populations. This meant that fasts could mean an especially meager diet for those who could not afford alternatives to meat and animal products like milk and eggs. It was only after the Black Death had eradicated up to half of the European population that meat became more common even for poorer people. The drastic reduction in many populated areas resulted in a labor shortage, meaning that wages dramatically increased. It also left vast areas of farmland untended, making it available for pasture and putting more meat on the market.