Because eating matzos rectifies the sin of Adam it is called מיכלא דאסוותא – “The food of healing”. This is because through the sin, death was brought into the world and through eating matzah we bring life into the world. Because of this the Tur (סי’ תצ) writes that the resurrection of the dead will take place on Pesach.
(ר צדוק הכהן מלובלין)