The present study evaluated the association of two measures of diet quality
with BMI and waist circumference (WC), overall and by education level, among
Mexican men and women.
We constructed two a priori indices of diet quality, the
Mexican Diet Quality Index (MxDQI) and the Mexican Alternate Healthy Eating
Index (MxAHEI), which we examined relative to BMI and WC. We computed
sex-specific multivariable linear regression models for the total sample and
by education level.
Mexican men (n 954) and women (n 1356)
participating in the Mexican National Health and Nutrition Survey 2012.
Total dietary scores were not associated with BMI in men and women, but total
MxDQI was inversely associated with WC in men (−0·10, 95 % CI
−0·20, −0·004 cm). We also found that some
results differed by education level in men. For men with the lowest
education level, a one-unit increase in total MxDQI and MxAHEI score was
associated with a mean reduction in BMI of 0·11 (95 % CI
−0·18, 0·04) and 0·18 (95 % CI
−0·25, −0·10) kg/m2, respectively.
Likewise, a one-unit increase in total MxDQI and MxAHEI score was associated
with a mean change in WC of −0·30 (95 % CI
−0·49, −0·11) and −0·53 (95 % CI
−0·75, −0·30) cm, respectively, in men with the
lowest level of education. In women, the association of diet quality scores
with BMI and WC was not different by education level.
Our findings suggest that a higher diet quality in men with low but not high
education is associated with lower BMI and WC.