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Question
Posted by: Anon | 2009/11/13

Fructose

Hi, Doc.

1. From where is fructose derived?
2. According to the eating for sustained energy book, 20g fructose is low GI - is that true?
3. which sugars are the highest GI sugars?

Thank you

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Our expert says:
Expert ImageDietDoc

Dear Fructose
Fructose is a naturally occurring sugar that is found in foods like fruit and table sugar. In countries like America, fructose is also produced from corn or maize syrup and is then called 'High-fructose corn syrup'. Most of the fructose sold commercially in SA is probably produced from cane sugar (also called table sugar or sucrose, which consists of one molecule of glucose and one molecule of fructose). Fructose has a low GI of 32, but it is not a good idea to ingest more than 20 g of fructose powder per day as it can cause weight gain and eye damage. The following GI-values are listed for other sugars: Honey (104), glucose (138), maltose (150), sucrose (92), lactose (65), high-fructose corn syrup (89) and maltodextrin (137). Most of these sugars thus have a high GI.
Best regards
DietDoc

The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.

1
Our users say:
Posted by: DietDoc | 2009/11/14

Dear Fructose
Fructose is a naturally occurring sugar that is found in foods like fruit and table sugar. In countries like America, fructose is also produced from corn or maize syrup and is then called 'High-fructose corn syrup'. Most of the fructose sold commercially in SA is probably produced from cane sugar (also called table sugar or sucrose, which consists of one molecule of glucose and one molecule of fructose). Fructose has a low GI of 32, but it is not a good idea to ingest more than 20 g of fructose powder per day as it can cause weight gain and eye damage. The following GI-values are listed for other sugars: Honey (104), glucose (138), maltose (150), sucrose (92), lactose (65), high-fructose corn syrup (89) and maltodextrin (137). Most of these sugars thus have a high GI.
Best regards
DietDoc

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