Sforno on Numbers 11:20/ספורנו על במדבר י״א:כ׳

1והיה לכם לזרא, they will eat so much of it that that it will cause an excess which in turn will produce sickness. This is what Assaph in Psalms 78,31 spoke about.

2למה זה יצאנו ממצרים?; we had such a variety of food there, not only manna.