Dieting that resulted in exorbitant glucose variability, perhaps, yeah. But there are a lot of other factors at play than just glucose/insulin - tiny example eg

Dieting that resulted in exorbitant glucose variability, perhaps, yeah. But there are a lot of other factors at play than just glucose/insulin - tiny example eg. leptin ~> activation of anorexigenic POMC neurons ~ melanocortin ~ glucocorticoids/appetite/obesity/sexual behavior/sleep + higher fasting insulin levels