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[h=2]found this seem like you need to eat Resistant Starchs with other types of fiber

How Resistant Starch Enhances Tumor Growth[/b]Now, for something a little more alarming. Several studies have demonstrated that, after exposure to a carcinogen, RS2 can actually enhance tumor growth (if it's not accompanied by other forms of dietary fiber). Yikes, right? One study using a rat model of colorectal cancer found that raw potato starch supplementation led to larger and more frequent tumors, compared to a low-resistant starch control diet. (After 20 weeks, 88% of the rats eating potato starch had tumors, compared to 74% of the rats on a control diet, and their tumor size averaged 191 mm[SUP]2[/SUP] compared to 87 mm[SUP]2[/SUP] on the control diet.) Here's the kicker though: when the rats were given potato starch plus wheat bran, those tumor-enhancing effects were suppressed (only 56% of the rats got tumors and the average tumor size was back down to 85 mm[SUP]2[/SUP]). In other words, a soluble fiber coupled with resistant starch seemed to counteract the increased tumorigenesis.

http://www.thepaleomom.com/2015/08/resistant-starch-its-not-all-sunshine-and-roses.html