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Al Roker has dropped some serious weight since starting the ketogenic diet in September.

“I’ve lost about 40 pounds,” Roker said on Monday’s “Today” while cooking a keto-friendly sloppy Joe recipe.

The TV personality even addressed his cholesterol levels, saying, “My cholesterol — just had them checked a couple of weeks ago. Everything’s good.”

The weatherman has been extremely vocal about his support for the trendy diet, which involves eating foods that are low-carb and high-fat, and has even defended it against critics.

When “Biggest Loser” trainer Jillian Michaels slammed the keto diet as unhealthy in January, the 64-year-old star responded, “What works for you, works for you. There’s science on both sides that says it’s not a great idea and science that says it is a great idea.”

He added, “I think it’s up to people, with their doctor, with their medical professional (to make their own decision).”