WW lost more points on Friday than a triple-cheese lasagna.

Shares of the diet company formerly known as Weight Watchers — which uses a points system to track its members’ eating habits — tanked 30 percent on Friday to $48 after it reported slowing revenue and subscriber growth.

For the second consecutive quarter the New York-based company’s subscriber growth dropped from a record 4.6 million during the first quarter to 4.2 million in the third quarter.

Despite celebrity endorsements including Oprah Winfrey, who is also an investor, Kevin Smith and DJ Khaled, WW now expects to finish the year with 4 million subscribers — up 25 percent from last year, but off 12 percent from the first quarter.

“Weight Watchers was a growth story and that growth has slowed now,” said ISS-Eva analyst Anthony Campagna.

The deceleration comes amid intense competition from meal-kit companies like Blue Apron, Hello Fresh, Plated, Whole Foods and growing interest in the high-fat Keto diet.

WW is trying to reinvent itself as a lifestyle brand rather than a diet, and has moved to make its point system less punitive.

“We are not only going to be the world’s partner in weight loss,” said Chief Executive Mindy Grossman during an earnings call. “We’re also going to be the world’s partner in wellness.”

Revenue in the quarter, while up 13 percent to $366 million, was $13 million shy of Wall Street’s expectations.