A guy having a mid-life crisis decides he'd like to fit into his old jeans again. He improves his eating and exercise habits. Despite weeks of his best efforts, there's no apparent improvement.
He supposes this is a dieter's WORST CASE SCENARIO.
What he doesn't know is that his spiteful ex-wife is a witch who once cast dark magic upon him to thwart any weight-loss endeavor.
So it was actually a CURSED WAIST scenario.