>>> from nutrition2 import nutrition2

>>> nutrition2([['bread', 2], ['meat', 1], ['milk', 3], 
... ['bread', 3], ['vegetable', 5], ['meat', 1], ['fruit', 2],
... ['milk', 1], ['fruit', 3], ['bread', 2], ['vegetable', 3],
... ['fruit', 2], ['meat', 1]], 9)
True