Below is the glycemic index (or impact on blood sugar) of common foods when compared to glucose. The higher percentage, the greater the food's ability to spike blood sugar.

Glycemic Index
100%	Glucose
80-90%	Carrots Parsnips Potatoes Honey
70-79%	Bread (whole meal) Millet Rice (white) Broad beans
60-69%	Bread (white) Rice (brown) Muesli cereal Shredded wheat Beetroot Bananas Raisins

50-59%	Buckwheat Spaghetti (white) Sweet corn Peas Yams Sucrose
40-49%	Spaghetti (whole meal) Oatmeal Sweet potato Beans (navy) Peas (dried) Orange Orange juice
30-39%	Butter beans Lima beans Haricot beans Blackeyed beans Chickpeas Apple Icecream Skim and whole milk Yogurt Tomato soap
20-29%	Kidney beans Lentil Fructose
10-19%	Soybeans Peanuts

More information on Glycemic Index

What are the Benefits of the Glycemic Index?

How to Switch to a Low Glycemic Index Diet