The association of dietary glycaemic index (GI) and glycaemic load (GL) with CVD has been examined in several populations with varying results. We tested the hypothesis that women with diets high in GI or GL would have higher rates of myocardial infarction (MI), and the associations would be stronger in overweight women. We measured dietary GI and GL in 36 234 Swedish Mammography Cohort participants aged 48 -83 years using FFQ. Cox models were used to calculate incidence rate ratios (RR) and 95 % CI for hospitalisation or death due to MI assessed using the Swedish inpatient and cause-of-death registers from 1 January 1998 until 31 December 2006. Over 9 years of follow-up, 1138 women were hospitalised or died due to a first MI. In multivariable-adjusted models, the RR comparing top to bottom quartile of dietary GI were 1·12 (95 % CI 0·92, 1·35, P-trend¼0·24), and the RR comparing top to bottom quartile of dietary GL were 1·22 (95 % CI 0·90, 1·65, P-trend¼ 0·23). Among overweight women, the RR comparing top to bottom quartile of dietary GI were 1·20 (95 % CI 0·91, 1·58, P-trend¼ 0·22), and the RR comparing top to bottom quartile of dietary GL were 1·45 (95 % CI 0·93, 2·25, P-trend¼ 0·16). There were no statistically significant associations of dietary GI or GL with MI in this population.
Glycaemic index: Glycaemic load: Myocardial infarctionGlycaemic index (GI), the relative increase in blood glucose due to carbohydrate in a test food compared with a reference food, was initially developed as a meal planning tool for people with diabetes mellitus (1) . More recently, there have been experimental and observational studies examining whether the carbohydrate quality influences the risk of CVD.Randomised diet trials have demonstrated that diets with reduced GI or glycaemic load (GL), the product of GI and carbohydrate content of a food (2,3) , influence total cholesterol (4 -6) , LDL cholesterol (4,6,7) , HDL cholesterol (8 -10) , TAG concentration (11,12) , plasminogen activator inhibitor 1 (12) , insulin resistance (4,11) and inflammation (11,13,14) in ways that would be expected to reduce cardiovascular risk. A meta-analysis of trials showed that low-GI and -GL diets reduced BMI, total body mass and fat mass more than control diets (15) , and a low-GL diet was better than a control diet for maintenance of weight loss (16) , possibly because low-GI and -GL meals result in higher satiety and lower food intake (17,18) . In addition, low-GI or -GL diets improve glucose control in people with diabetes mellitus in randomised trials (9,19) and are associated with lower risk of developing diabetes mellitus in observational studies (20 -22) .There have been several previous studies examining the association of dietary GI, the average GI of carbohydrates consumed, and dietary GL, the product of dietary GI and total carbohydrate, with CHD (3,23 -26) . A meta-analysis that pooled data from prospective studies of men and women reported a statistically significant association (27) . However, dietary GI and GL were associated ...