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Here it is for the foods mentioned in the article:

  Watermelon......... 8.2 cal/gal
  Almond............. 7.0
  Head of broccoli... 5.9
  Cantaloupe......... 3.7
  Corn cob........... 1.5
Source: USDA



Do you really mean cal/gal? Corn has fewer calories per gallon of water than watermelon? It's not gal/cal?


Could just mean water melon soak up water very fast and are good at retaining it.


Refers to total water used in the cultivation of said product. Not water retained in the final product




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