Ronzoni is ripping off customers by shortchanging them on the company’s healthy pasta alternatives … this according to a new lawsuit.

An unhappy pasta fan claims she gravitated to Ronzoni’s new option … 5 different pastas with fewer calories that make for healthy choices.

The woman was horrified to learn … although the 5 pastas come in the standard box, there’s 25% less pasta inside and consumers have no idea they’re getting a lot less for the same price.

She’s filed a class action lawsuit on behalf of all Ronzoni pasta fans.

If she wins, they’re all gonna be carbo-loaded.