Mayan collapse theory

My theory about the Mayan collapse is that the Mayans were forced to move, due to a lack of food and proper nourshment. It has been proved through bottany research that the Mayans overfarmed their land, causing the foundations of their houses to weaken due to emaciated soil. The emaciated soil destroyed their ability to continue to grow crops therefore starving them. The proof of this is found in the skulls discovered in the Mayan city of Copan. After an autopsy it was discovered the Copan citizens whose skulls were found died of anemia due to lack of nourishment. The only near finished structures in Copan that were suddenly abandoned in 822 A.D leads me to believe that this city was abandoned like many others around this time while citizens desperately tried to escape the famine by running away. The once great nation now a bunch of half starved people out in the wild with no city or houses to shelter them soon fell apart collapsing near 900 A.D.