I think there is a fundamental misunderstanding about what cancer is.
Cancer is the natural byproduct of a growth that is not controlled (Either by the self in a visibly self understood way) or by the other self (channeling the growth towards a desired healthy outlet that can be used to bring a "new creation" into existence). Control by self denotes STS and control by other self denotes STO, now this is just in very very raw basic cases true and should not be poked for the individual cases since it would break apart.
But I see this understanding as being key to understanding what cancer actually is. It's not specifically the acidic food or the self hatred that creates cancer, If and I stress this, IF the M/B/S-C derives pleasure from acidic food and self hatred as a primary source then they will not, under any normal conditions, produce cancer.
Like earlier debates about nutrition and other similar topics where I've chimed in in the past to point out that its not specifically one action or another that produces what is universally considered negative consequences regardless of polarity (loss of body complex and or disintegration and or cancer etc), but that there are alignment specific causes of disease. Let me demonstrate by analogue.
If you wish to be a tentacle monster that slithers up and down walls and can drop limbs at will and regenerate them etc etc etc, you will certainly enjoy acidic foods, random mutations, cancers and etc. These will be your "food."
case in point:
These creatures clearly don't mind acidic food and random mutations. But if you prefer something more along the lines of:
I would unequivocally and without reservations say that you should not eat acidic foods and generally you should avoid random mutations and growths.
However, if you consider your life to be more along the lines of a diplomat, a messenger, a seer of players, an Icarus of sort, it will not be harmful in the extreme to participate as required in both the consumption of acidic food in acidic societies and the refusal to consume acidic foods in non-acidic societies. If such a simplification is applicable here.
In closing, if you don't mind "existing" as a cthulhuan tentacled monster in a state of contentment with your eternally mutating toxifying nature then by all means, engage in it. But there are many styles of "existing" that may not be compatible with yours.
Seeing as you don't really "die" but rather, shift into a world that is more compatible with your view of what is out there(but shh, that's a spoiler), if you keep doing bad things to yourself you will end up a world fitting your inner image. If that is not a problem or if it is something you actively seek, then by all means, engage in it.
Speaking as a diplomat that tries to acclimate to the environment I am in and engage in practices from the acidic to the most alkalic, I see no problem with people clearly indicating their inner nature by the choice of public food consumption, its all in free will. I do however always feel sad when an another self sees the need to remove themselves from the timeline for no clear or discernible reason of which most often the above mentioned first desire in terms of life is a clear symptom.
I hope this clarifies some potential misunderstandings about my stance in this.
Also, PS. If i wanted to detox now from where my diplomatic nature has taken me using the best healing/cleansing regimens in a clean and loving environment I estimate it would take 3 to 18 months to get back to a "good safe alkalic base". And that's with an assumption of total lifestyle adjustments and I'm still "relatively" healthy, so this is not in anyway to downplay the seriousness and the depth of long term damage done by acidic lifestyles and foods.
All in all I think the concept of food in totality is best described in the dinner scene in Peaceful Warrior.
What ever you do with your food, don't eat sloppy.