The effect of high and low glycemic index diets on the fasting blood glucose levels in non-diabetic, postmenopausal, obese, caucasian women
The purpose of this study was to compare the initial fasting blood glucose (FBG) to the final FBG from two groups of non-diabetic, postmenopausal, obese, Caucasian women, to ascertain whether there was a significant difference in FBG after following a high or low glycemic index (GI) diet. Twenty five data files from studies done in 1990 and 1992 were analyzed for this tudy. Thirteen women followed the low GI diet, and twelve women followed the high GI diet over a four week period. Three days from the last week of the diet were analyzed to obtain a mean GI for each subject. The initial FBG and the final FBG were compared u ing a two tailed, two sample t-test to determine whether there was a significant difference. The results of this study revealed that there was not a significant difference in the initial FBG and the final FBG in either diet group. The GI diet did not affect the final FBG. Problems with the study included a small sample size, the files were not randomly elected due to the use of pre-existing data, and no involvement in the original collection of the data. The subjects were also free living which allowed for the possibility of inaccurate election and measurement of food . Using a controlled environment would improve the validity of the data.