We all scream for...soft-serve? As those creamy ribbons of flavor do the twist into your cup, you give yourself kudos for sticking to your diet with this sweet ice-cream swap. But here's the cold, hard truth: Sketchy nutritional info, excessive toppings and super-heaping portions can all sabotage your weight loss—without you even knowing it! Here's how to decide what's worth the splurge.

what's this?