[gcruse]

... Most all mammals, except humans and two or three
others are able to convert glucose into vitamin C.
Humans have the first three enzymes but
not the fourth.

Now, why would God create only 3/4s of the
ability to make vitamin C and stop,
in humans only?  If we are, indeed,
in his image, does that make God
a vegetarian?  Uh oh.

[Genesis defender]

... Most all mammals, except humans and two or three others are able to convert glucose into vitamin C. Humans have the first three enzymes but not the fourth.

Now, why would God create only 3/4s of the ability to make vitamin C and stop, in humans only? If we are, indeed, in his image, does that make God a vegetarian? Uh oh.

You are assuming that God created us as we are today. It is entirely possible that over time, humans as a species lost the ability (through natural selection) to manufacture the fourth enzyme needed to make vitamin C.