They reduced the amount of sugar they were eating, swapped white bread for whole grain and started planning high-protein meals with lots of vegetables.
In recent years HMSHost has made several changes to their menus, including adding a variety of new salads, offering hummus plates as an appetizer and providing whole-grain bread for sandwiches.
Since 1 calorie of beef requires 8 times as much input of grain as a single calorie of bread, Petrela recognizes that rising protein consumption means a rising demand for grains which in turn means a rising demand for global farmland.
As for cross-breeding, Mother Nature had done it first, cross-pollinating different wild grasses until they produced a grain that could eventually expand into modern bread.