Dietary glycemic index, glycemic load, fiber, simple sugars, and insulin resistance: the Inter99 study.
OBJECTIVE
To examine the relationship between daily glycemic index, daily glycemic load, simple sugars, dietary fiber, and the prevalence of a measure of insulin resistance in 30- to 60-year-old nondiabetic Danish men and women.


METHODS
The Inter99 study is a nonpharmacological intervention study. We used baseline data and examined cross-sectional associations between carbohydrate-related dietary factors and an estimate of insulin resistance in 5,675 subjects at 30-60 years. The dietary intake was estimated from a self-administered food frequency questionnaire, and insulin resistance was estimated using the homeostasis model assessment of insulin resistance (HOMA-IR). Multiple regressions were performed with HOMA-IR as the dependent variable and carbohydrate-related factors as explanatory variables. All models were adjusted for age, sex, smoking, physical activity, total energy intake, BMI, and waist circumference.


RESULTS
Intake of lactose was positively associated with HOMA-IR (P < 0.0001), whereas daily glycemic load and intake of glucose, fructose, dietary fiber, total carbohydrate, fruit, and vegetables were inversely associated with HOMA-IR (P < 0.05). Intake of dietary fiber explained the associations with daily glycemic load and total carbohydrate and attenuated the association with fruit and vegetables. No significant associations were observed for daily glycemic index or sucrose.


CONCLUSIONS
Habitual intake of diets with a high glycemic index and high glycemic load or diets with a high content of total carbohydrate including simple sugars was not associated with the probability of having insulin resistance. Furthermore, intake of dietary fiber was inversely associated with the probability of having insulin resistance.
Lau
Cathrine
C
Steno Diabetes Center, Niels Steensens Vej 2, DK-2820 Gentofte, Denmark. cala@steno.dk
Faerch
Kristine
K
Glümer
Charlotte
C
Tetens
Inge
I
Pedersen
Oluf
O
Carstensen
Bendix
B
Jørgensen
Torben
T
Borch-Johnsen
Knut
K
D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D003430:Cross-Sectional Studies; D003718:Denmark; D004040:Dietary Carbohydrates; D004043:Dietary Fiber; D019422:Dietary Sucrose; D002149:Energy Intake; D005260:Female; D005951:Glucose Tolerance Test; D038321:Glycemic Index / Q000502:physiology*; D006801:Humans; D007333:Insulin Resistance / Q000502:physiology*; D008297:Male; D008875:Middle Aged
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004043:Dietary Fiber; D019422:Dietary Sucrose