chocolate-milk alternative

Refers to a "just as bad or worse" substitution-product/activity employed to supposedly "fill the void" created by a discontinued unhealthy habit --- the idea here is that while the milk itself may indeed be low-fat, the added calorie-rich and sugary-sweet chocolate has far more fattening ingredients than just the cream in full-fat milk could possibly have contained, and so the person will likely gain even more weight than ever.