How is the GI measured?

The glycemic index is a measure of the effect of foods to raise blood sugar glucose levels after being eaten. The Glycemic index rating of foods must be measured using valid scientific methods.

The Glycemic Index Rating of a food is determined by Human Clinical Trials utilizing a portion of the food containing 50 grams of digestible (available) carbohydrate and then measuring the effect on their blood glucose levels.

Foods with a high GI score contain rapidly digested carbohydrate, which produces a large rapid rise and fall in the level of blood glucose. In contrast, foods with a low GI score contain slowly digested carbohydrate, which produces a gradual, relatively low rise in the level of blood glucose.

1Protocol and Methods
At Low Glycemic Certification Lab, our Glycemic Index Human Clinical Trials fully complies with all State, Federal, and ISO International rules and follows an Investigational Review Board (IRB) protocol to determine the Glycemic Index evaluation and recommendation for food classification.
2What if I also want the Glycemic Load of my product determined or my product is not appropriate for Glycemic Index testing?
Low Glycemic Certification Lab is pleased to offer Glycemic Load Rating for your product upon request.
3What if my products are very similar in composition. Do I need to test each product separately?
With minor flavor changes of your product having essentially the same macronutrient composition that do not affect the relative carbohydrate characteristics of the product, flavours may be able to be combined for Glycemic Index testing. Please enquire about this during your submission process.
4If I reformulate my product, do I need to retest its Glycemic Index Rating?
Reformulation may affect the Glycemic Index of the carbohydrates in your product and so it may need to be retested. Low Glycemic Certification Lab Medical Director of Research will review the reformulation changes to determine if retesting is recommended or necessary.
What information do I need to send you to get testing started ?

For Glycemic Index testing,please send our Lab the macronutrient content of your products. Once we receive the macronutrient composition and the ingredient list of your product, we will be able to tell you whether your product qualifies for Glycemic Index testing. If your product is eligible for testing we will estimate the quantities of your product which we require and can give you a final cost. You will be asked to send Low Glycemic Certification Lab the specified amount of test product(s), payment and sign the Terms of Research contract. Then testing can begin.

1Can you test my product in people with diabetes or other food related diseases?
Low Glycemic Certification Lab can arrange a specific protocol for your specific needs whenever possible. Please enquire with the Medical Director as to your specific protocol needs.
2Do you offer consultation to help lower the Glycemic Index of our product?
We can work with your company to develop new Low Glycemic Index products or help lower the Glycemic Index of existing ones. Your results are strictly confidential and are your property. Data are released for publication only with your written approval.
3Can I display a low Glycemic statement on my product labels?
Foods that meet nutrition guidelines and pass the Low Glycemic Certification Lab protocol testing can display a Low Glycemic statement.
4Is my product eligible for Glycemic Index testing?
The Glycemic Index is a measure of how the carbohydrate in a given food affects blood glucose levels. Products need to contain sufficient amounts of digestible carbohydrate to be eligible for Glycemic Index testing. If your product is very low in digestible carbohydrate, there are alternative ways of measuring your food's impact on blood sugar.
5How Long Does it Take to Test a Product?
Following the Human Clinical Trial, results can usually be available within 2 weeks.
6What is the cost to have my product tested for its Glycemic Index rating?
Costs for the Glycemic Index testing depend on the number of products being tested, complexity and particular Protocol being utilized during the Clinical Trials.
7What are the laws regarding label claims on my food package?
The FDA does not approve labels of food products. It is the manufacturers responsibility to ensure the label is correct by following the guidance provided in the Food Labeling Guide. Any further questions regarding the FDA label laws please email: fcicinquiry@fda.hhs.gov "The Food and Drug Administration (FDA) is responsible for assuring that foods sold in the United States are safe, wholesome and properly labeled. This applies to foods produced domestically, as well as foods from foreign countries. The Federal Food, Drug, and Cosmetic Act (FD&C Act) and the Fair Packaging and Labeling Act are the Federal laws governing food products under FDA's jurisdiction. The Nutrition Labeling and Education Act (NLEA), which amended the FD&C Act requires most foods to bear nutrition labeling and requires food labels that bear nutrient content claims and certain health messages to comply with specific requirements. All new regulations are published in the Federal Register (FR) prior to their effective date and compiled annually in Title 21 of the Code of Federal Regulations (CFR)". In order to properly label a food as low glycemic appropriate supervised human clinical trials on that specific food are required.