What I posted was apparently wrong. I apologize. I'm not finished researching the topic, but it looks like the most recent authoritative document might be something called "Dignitas Personae" issued by the Vatican in 2008. Checking various sources including Jeffgo's earlier link from 2005, the picture that emerges now is that the Vatican indeed condemns not only the procedure of obtaining cell lines from aborted babies, but also the use of these cell lines for the production of vaccines. It looks like there's a single special exception made by the Vatican: in the USA, vaccines against certain diseases are only available in versions that have been produced by using human fetal cell lines from aborted babies. When an alternative vaccine produced using animal cell lines or ethically permissible types of human cell lines is absolutely not available, apparently the Vatican permits us to use the vaccine produced on aborted human fetal cell line. I say "apparently" because I still haven't found the primary Vatican document, only other people's commentaries on it.
If my research so far is correct, it would be a giant leap to claim that just because the Vatican allows people to use certain vaccines in the USA in a narrowly defined situation (e.g. a vaccine produced on animal cell line might be available in Japan, but not in the USA), that now it's OK to broaden the use of these immorally developed human fetal cell lines for other purposes such as the testing of food components.
I'm quite shaken because the HEK293 cell line is almost universally used, in thousands of laboratories across the USA and across the globe. It is one of the first choices scientists use for cell transfection studies, along with a few other cell lines like NIH 3T3 (rat fibroblast), CHO (chinese hamster ovary), COS-7 (monkey kidney), Xenopus oocyte (frog), PC-12 (rat) and perhaps human HeLa cells (but this is an ethical cell line - obtained by surgical resection of a cervical cancer from a female patient). I have read countless times in the Materials and Methods section of scientific papers this expression, "HEK293 human embryonic kidney cell line", and yet I never put 2 plus 2 together, I never realized that this was a cell line from an aborted baby. :o I'm disappointed with myself. I don't know, whether the researchers using this cell line are more aware than I am that this widely used cell line is really from an aborted baby (well the cell culture specialists are probably more aware - I'm just a chemist and never work with biological material myself).
RedSoxWife, you were apparently on the right track that the use of cell lines from aborted babies creates demand for yet more and newer cell lines from aborted babies. I quickly glanced through some articles on the history of these cell lines and what I found is gruesome. 18- to 21-week old fetuses were vivisected (cut into pieces while alive and awake, no anaesthesia) and their organs removed in order that the cells could be isolated from the freshest possible tissue. And while certain vaccines are being produced on a human fetal cell line named WI-38, obtained in the 1960s, there are researchers (or shall I say butchers) already trying to produce other similar fetal cell lines, just in case that the WI-38 cell line would expire (would become unavailable due to senescence, contamination, whatever).