Low-Carb Diets and Cycling

[Triskeliongirl]

Hi Dianyla- If you really did the test with fructose and not glucose, it is not a glucose tolerance test. It only tells you how your body processes fructose. Here is an abstract indicating that even diabetic patients can handle fructose better than glucose:

1: Diabetes Care. 1980 Sep-Oct;3(5):575-82.Links
Effects of oral fructose in normal, diabetic, and impaired glucose tolerance subjects.Crapo PA, Kolterman OG, Olefsky JM.
We studied the acute effects of oral ingestion of 50-g loads of dextrose, sucrose, and fructose on post-prandial serum glucose, insulin, and plasma glucagon responses in 9 normal subjects, 10 subjects with impaired glucose tolerance, and 17 non-insulin-dependent diabetic subjects. The response to each carbohydrate was quantified when the respective carbohydrate was given alone in a drink or when given in combination with protein and fat in a test meal. The data demonstrate that (1) fructose ingestion resulted in significantly lower serum glucose and insulin responses than did sucrose or dextrose ingestion in all study groups, either when given alone or in the test meal; (2) although fructose ingestion always led to the least glycemic response compared with the other hexoses, the serum glucose response to fructose was increased the more glucose intolerant the subject; (3) urinary glucose excretion during the 3 h after carbohydrate ingestion was greatest after dextrose and least after fructose in all groups. In conclusion, fructose ingestion results in markedly lower serum glucose and insulin responses and less glycosuria than either dextrose or sucrose, both when given alone or as a constituent in a test meal. However, as glucose tolerance worsens, an increasingly greater glycemic response to fructose is seen.

PMID: 7002511 [PubMed - indexed for MEDLINE]

[Dianyla]

Hi Dianyla- If you really did the test with fructose and not glucose, it is not a glucose tolerance test. It only tells you how your body processes fructose. Here is an abstract indicating that even diabetic patients can handle fructose better than glucose:

Hey, good catch! I ate a tub of artisan sorbet locally made. It didn't have a nutrition info label, but I am guessing it was mostly fructose (from the fruit) and maybe some sucrose (from cane sugar) as well. I assumed it would be processed roughly the same as glucose, being all simple sugars. I guess it's good news for eating healthy sources of carbs like fruit. I'll redo the test with straight glucose, then.

This week I saw my doctor and based on what I was telling him he ordered some sort of diabetic panel. I know it contained the hbA1C, serum insulin, and one or two other tests. Also a lipid panel. So... I'm really interested in the A1C results since that will show a better picture. I'll know more in two weeks when I go back to discuss results.

[Triskeliongirl]

Hey, good catch! I ate a tub of artisan sorbet locally made. It didn't have a nutrition info label, but I am guessing it was mostly fructose (from the fruit) and maybe some sucrose (from cane sugar) as well. I assumed it would be processed roughly the same as glucose, being all simple sugars. I guess it's good news for eating healthy sources of carbs like fruit. I'll redo the test with straight glucose, then.

This week I saw my doctor and based on what I was telling him he ordered some sort of diabetic panel. I know it contained the hbA1C, serum insulin, and one or two other tests. Also a lipid panel. So... I'm really interested in the A1C results since that will show a better picture. I'll know more in two weeks when I go back to discuss results.

It is definitely good news that you can tolerate fructose. The sorbet I bet was also made with glucose, but not knowing the amounts just make your test harder to interpret, but overall your response looked great so if you are glucose intolerant, its a lot less than I am since I can't even tolerate fruit. Maybe the paleo diet will be a good fit for you! I also think its great that your doc ordered the other tests. The A1C will tell you a lot about where you average blood sugar has been for the past 3 months.