It is not a mitzvah. It is an eitzah tovah, but not a mitzvah. There is no obligation to specifically eat bread in the morning, although in Bava Metziah 107, Chazal say eating bread with salt and a jug of water in the morning protects against many illnesses. There are a whole host of authorities who say that Talmudic medicine and science do not necessarily apply today. (Nishtaneh hatevah). I donlt think there is any concrete evidence behind this eitzah. It is not incumbent upon us to follow health advice in the Gemara or Rambam.
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