Most research shows that fiber has no effect on polyps. I believe it takes several years for polyps to grow large enough to be seen during a colonoscopy. I'm not sure of the exact amount of time needed.
Yes, I'm pretty sure that diabetes might have a lot to do with it because insulin resistance will have a large effect on transporting nutrients out of the bloodstream and into the cells where it's needed. IOU, that vitamin D and magnesium might not have been helping you as much as it would if you didn't have diabetes. The way this works is explained in my Pancreatic Cancer book.
From page 20:
Could a chronic magnesium deficiency lead to the development of type 2 diabetes?
As we will see in the next chapter, it's well known that magnesium deficiency is correlated with insulin resistance, and it's a medical fact that many people who have type 2 diabetes have low blood magnesium levels. This connection is very likely the reason why diabetes is also closely associated with pancreatic cancer. Diabetes is listed in this book as a separate risk for the development of pancreatic cancer, but bear in mind that magnesium deficiency might possibly be the primary reason why diabetes is associated with PC.
And from page 25:
Magnesium and insulin are co-dependent.
One cannot function properly without the other. And this is a 2-way street in many regards. Not only does a magnesium deficiency cause insulin resistance in the cells of the body, and reduced insulin production by the pancreas, but there is a reciprocal effect. Insulin is responsible for the transport of nutrients to locations where they can either be immediately utilized or stored for future use. When the availability and effectiveness of insulin is compromised, extra magnesium in the blood cannot be properly stored, so most of it may be wasted, instead (Sircus, 2009).27
This can dramatically increase the odds that diabetes patients may develop a magnesium deficiency. And of course as the magnesium deficiency becomes worse, insulin resistance may increase and insulin production by the pancreas may decline even further.
But even stronger evidence of the association between magnesium deficiency and diabetes has been found by researchers. Research published by Hruby et al. (2014) found that higher magnesium intake reduces the risk of insulin resistance and the risk of progression from a prediabetic condition to diabetes.28 In that study, people who had the highest magnesium intake had only about half the risk (53 %) of metabolic interference or diabetes development compared with those who had the lowest magnesium intake. This information is especially important for those who have been told by their physicians that their blood test results indicate that they are at a stage known as prediabetes.
References 27 and 28 from the quote above:
27. Sircus, M. (2009, December 8). The Insulin Magnesium Story [Web log message]. Retrieved from
http://drsircus.com/medicine/magnesium/ ... um-story-2
28. Hruby, A., Meigs, J. B., O’Donnell, C. J., Jacques, P. F., & McKeown, N. M. (2014). Higher Magnesium Intake Reduces Risk of Impaired Glucose and Insulin Metabolism and Progression From Prediabetes to Diabetes in Middle-Aged Americans. Diabetes Care, 37(2), 419-427. Retrieved from
http://care.diabetesjournals.org/content/37/2/419
Tex