3.21 According to an article in Mobile Register (Study:

Breast-feeding may prevent diabetes in moms as well as babies), a new study published in the Journal of the American Medical Association on November 23, 2005, reported results of a long-running health study. In this study that began in 1976, 6.3% of women who breast-fed less than 1 year or not at all developed diabetes, compared with 5.5%

of women who breast-fed for more than a year.

a Is this an observational study or an experiment?

Why?

b Dr Schwartz of Dartmouth Medical School said the results may reflect the healthy lifestyles of women who breast-fed rather than breast-feeding itself. What do you think about this comment? If it is true, then what do you think is happening here?