[porphyra]

Isn't kombucha way less than "moderate to heavy alcohol consumption"? Besides, small amounts of alcohol form naturally from stuff fermenting in your gut. To be honest, I would be more concerned about my tooth enamel degrading from heavy kombucha consumption (as it is very acidic) rather than the alcohol content.

[sosilkj]

It seems like the question you're posing is: in the context of colon cancer risk, if one's alcohol consumption isn't enough to reach the category of "moderate", does that mean the increased risk is zero (or insignificant)? I don't know the answer to that. That's something that could perhaps be determined by reviewing the literature.

Edit: Not that anyone cares, but I guess I'll say a bit more: I don't know what brand of kombucha OP drinks, or how much of it, and how many grams of alcohol that sums up to, and what the current body of research says (or doesn't) regarding the precise amount of risk incurred or not from that amount of alcohol ... but the fact is, there's extensive research on the association between alcohol and cancer and I stand by the suggestions that someone dealing with recurrent colon cancer should be cautious about alcohol consumption, and that it could be worth reviewing existing research on the matter.

[prepend]

It’s not reasonable to conclude that because moderate alcohol causes an effect that less than that causes a diminished effect.

You need evidence, or at least some logical basis, to make a claim or believe such a thing.

You can review the literature to find something. Typically is a paper is publishing about moderate levels causing an effect they will cite or be cited by other studies showing effects from other levels.

There are many things in nature that are harmless at some level and become harmful at another level. And there’s no negative effect whatsoever from the appropriate level.