According to Shannon Horst, CEO and co-founder of the Savory Institute, ranchers can consistently double, and even quadruple livestock capacity over time. (See an article in TIME for more on the Savory grazing technique).
He initiated the proposal because his fifth-grade daughter is in the 6-to-11 age group that has seen obesity rates quadruple over the past 30 years, the same time that the Happy Meal has been on the market.