It’s the countdown to Halloween, and so for this week’s installment of our “Wellness Wednesday” series, we have candy on the brain. We caught up with Rachel Reynolds, assistant director and senior nutritionist at Boston University's Sargent Choice Nutrition Center, to talk about—what else?—sugar.

Is sugar always bad? How can you practice self-control? And is it OK to throw out the sugar rules for one day and go a little, uh, nuts?