I wanted to share a resource I use all the time to check out the quality of unfamiliar foods. Autumn was asking me today about rice noodles, and we swapped a few messages tracking down their glycemic index value (it's 53, apparently). Inevitably, it seems, I ended up on my favorite "nutritiondata" site again. Here's their explanation of the Glycemic Index and Glycemic Load:
Glycemic Index – NutritionData.com
If you want to know everything there is to know about virtually any food, just search for it and dig into the nutritional facts. I use this site all the time to check out ingredients I add to my smoothies.