Another possible reason was you were not hydrated enough. Also, if you engaged in some sort of physical activity, such as more walking than normal, and if you had not drunk enough liquids, particularly water, that combination can cause cramping in the legs.
I occasionally get cramping in the same way you describe, and it's not the sodium or lack of it that is the culprit. I simply drink a couple of glasses of water, and the cramping goes away rather quickly.
I personally don't know that eating fast food for one big meal would cause the cramping you describe.
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