Sugar cravings, particularly when stressed or depressed, are driven by the activation of reward and pleasure centers that alter internal state.

“Because it makes us feel good by the way, we'll get to that. That's his answer. - Soothing. - It activates, what I'm going to generically refer to as reward pleasure centers in a way that it dramatically, changes our internal state. This is in why do we eat a gallon ice cream when we're very depressed?”