I'm sure that millet is one of the good options, as it has been a staple grain in much of the world since antiquity.  However, I would strongly caution against any claims of any particular crop is a "superfood" or panacea for nutritional needs globally.  A balance of nutrients needs to be approached holistically, not with the insertion of a single grain. More telling in the comment is that there is still a LOT more that can be done to improve water use for crop production - particularly in irrigation methods.  Also noted are the land use issues which are properly addressed at the source than with a random change in the crop.

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I'm sure that millet is one of the good options, as it has been a staple grain in much of the world since antiquity.  However, I would strongly caution against any claims of any particular crop is a "superfood" or panacea for nutritional needs globally.  A balance of nutrients needs to be approached holistically, not with the insertion of a single grain.

More telling in the comment is that there is still a LOT more that can be done to improve water use for crop production - particularly in irrigation methods.  Also noted are the land use issues which are properly addressed at the source than with a random change in the crop.