Controlling subjects’ prior diet and activities does not reduce within-subject variation of postprandial glycemic responses to foods

In Campbell et al. 2003, smokers returned similar glycaemic response and variability under controlled and uncontrolled conditions.

“Participants who were smokers (three out of thirteen) reported 'craving' during the controlled tests, but nevertheless returned similar values for glycaemic response and variability under the two conditions.”

In Campbell et al. 2003, mean glycaemic response did not differ between controlled and uncontrolled tests.

“There was no effect on mean values of glycaemic response.”

In Campbell et al. 2003, variability of glycaemic response was no greater in uncontrolled tests than in controlled tests and tended to be lower.

“In contrast to expectations, the variability of results was no greater in the 'uncontrolled' tests and in fact tended to be lower.”

In Campbell et al. 2003, vigorous physical activity before uncontrolled tests did not significantly affect glycaemic response, though there was a tendency to lower blood glucose at 90 min.

“Vigorous physical activity on the day before the 'uncontrolled' tests did not produce a significant effect, although there was a tendency to lower blood glucose concentrations at 90 min.”