They were light flakes of wafer that tasted like honey. Sounds like they were sweet and sustaining (have read the OT), and I don't think that they can be explained away all that easily...miracles deserve to be accepted with gratitude. The manna was a miracle.
* disclaimer ~ I am not particularly religious, but I do believe that often the magic and mysteries in our lives is a matter of what we see and how we see it. If we wish to explain things away, we will. If we accept gifts and blessings for what they are, we will be grateful, joyful, happy, and full of love.