Ever since the beginning some percentage of people trying out supplemental resistant starch in the form of Potato Starch have complained of nightshade tolerance issues, primarily headaches and joint pain. This was a mystery, because some of us, including myself, were operating under the belief that these toxins were water soluble. Turns out not so.
I'll let Ken Willing explain, as well as deliver a very simple solution (literally).
Contrary to widespread belief, the nightshade glycoalkaloid poisons alpha-solanine and alpha-chaconine are not soluble in water, so unfortunately it's wishful thinking to assume that these headache-causing and arthritis-worsening toxins are entirely absent from potato starch—even a good brand like Bob's. For those of us outside the U.S., the problem is worse, because Chinese, Thai and Vietnamese brands available worldwide are of dubious reliability: the starch itself is OK, but in it we encounter not only the usual nightshade toxins but also sulfite preservatives, not to mention shelf bacteria in abundance.
Fortunately there is a remedy for these problems—my headaches stopped cold the day I started implementing the following. This method rests on the fact that solanine and chaconine DO dissolve in acid, even a fairly weak solution—in fact experimenters have successfully used as low as 1.5%:
—In the evening, fill a suitable bottle 3/4 full of water and dump in tomorrow's dose of potato starch, together with one heaping teaspoonful of citric acid powder (available in the baking-aids section of any supermarket). (Alternatively, make up a reasonably sour solution with white vinegar, but this is less satisfactory.) Shake well to fully disperse the starch and dissolve the acid crystals. Then wait a couple hours while the starch falls to the bottom to form a non-Newtonian mass. Then, carefully pour off the liquid—which now contains the solanine, etc., in solution—while the starch granules, tightly packed together, adhere in a clump on the bottom. Then, as a rinse: re-fill the bottle with fresh water, shake vigorously again to re-disperse the starch, and let it all sit till morning.
In the morning, again pour off the water, which is now only very slightly acidic. What you now have on the bottom is CLEAN potato starch, which can either be mixed in the same bottle with juice, milk, or water; or dug out and used some other way. I know this all sounds complicated, but I've clocked the total procedural time at about 2 minutes—a small price to pay for poison-free starch, in my opinion... and 100 trillion tiny mouths will thank you.
Thanks Ken. No telling how many people this will really help who would benefit from the PS, but just couldn't do it. Now they can try again.
So, I'd ask that all of you who've seen reports like this in the various forums and such you've frequented, please spread the word and help spread the benefits.