Jillian Michaels is hands-on with every aspect of her brand, including her newest venture into health foods. In a sneak peek for the Tuesday night episode of her new E! reality TV series "Just Jillian," the former "Biggest Loser" star stops by a local grocery store to taste test one of the meals offered by her new health food brand Slim Soul by Jillian Michaels ahead of the brand's launch.

But the 42-year-old mom of two is on a mission. After tasting the Slim Soul recipe for bean pasta - and hating it - Michaels wants her customers to agree that it doesn't taste good so she won't have to carry it in the new line prepared meals.

"This is delicious," one customer tells Michaels as she tries some of the bean pasta.

"Oh come on, no stop it," Michaels tells the customer in the clip. "Don't say that you like it because you think I want to hear that you like it. If you don't like it, I want to hear that you don't like it."

"No, no this is delicious, this is something I would buy," the woman says, and Michaels utters a swear word.

Two other female customers agree that Michaels' Slim Soul bean pasta is tasty, but Michaels still thinks they're just saying that because they don't want to offend her.

The pasta gets more compliments from a handful of other customers, and Michaels doesn't believe them. She replies by saying "f--k you", "sh--" and even goes as far as telling a grocery store chef that his reaction to the food "sounds like bullsh--." After a barrage of swear words, Michaels' business partner Lisa approaches her to reprimand her about her behavior.

"Jillian," Lisa says, "you can't swear at customers."

"Why?" Michaels asks.

"Because you're in Ralph's and you can't swear at their customers, it's not nice," Lisa says.

Michaels doesn't even realize that she used foul language while talking to the customers and she asks her assistant Nicole if she really did swear.

"You probably did," her assistant Nicole says. "I tune it out now too because you say it so often."

Watch the full sneak peek below and be sure to catch tonight's episode of "Just Jillian," airing at 10 p.m. EST on E!