Glucose and insulin- Big negatives?

Cancer Compass (great resource) just had an article about the negative effects of excess glucose and insulin on getting a relapse of cancer polyps in the intestine.  Excess of glucose and insulin ( as in prediabetes) had a significant increase in relapse of the polyps and caner.  But what does this mean?  Doe it mean I should eat less sugar?  I had stage two rectal cancer and Im a year past chemo.  I guess it means I should do a regimen of exercise to avoid diabetes - exercise, low carb diet.  I will really miss my sweet foods even though I really don't eat much of it.  Say it isn't so: I must give up chocolate. :) 

 

my wife has stage 4 stomac cancer. The tpn she on is 70% glucose