Verdict
i conclude that Jack ate ALL the pie... see below for supporting evidence

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Evidence 1: The members of SG1 discovering Jack alone with a whole table of pies |

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Evidence 2: Jack clearly eating pie while the other members of SG1 leave food untouched |

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Evidence 3: Numerous pictures of Jack eating pie... quite obviously showing he has an addiction |
Another main suspect was Sam, however we found clear evidence that Sam did not eat ALL the pies (see below)

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Evidence 1: This picture clearly shows that Sam is a 'blue jell-o' woman* not a 'pie' woman** |
* A blue jell-o woman is a woman who likes blue jell-o not a woman made out of blue jell-o
** A pie woman is a woman who likes pie not a woman made out of pie This is a 'Shout Out' to Pete and Rob just coz they are great |