Kristen Bell Shares the One Rule She and Dax Shepard Have Maintained While Raising Their Kids (Exclusive)

The mom of two has a golden rule she and Dax Shepard make sure to follow through on

• Kristen Bell is joining PLEZi Nutrition — the Public Benefit Company co-founded by former First Lady Michelle Obama — as an investor, advocate and brand partner

• The mom of two tells PEOPLE that healthy eating is at the forefront of her mind as her kids continue to grow

• Bell reveals the one rule she and husband Dax Shepard have kept in place throughout the different stages of Delta and Lincoln's growth

Kristen Bell is teaming up with Michelle Obama to keep families healthy and happy about their food and drink choices.

The Frozen actress, 43, is teaming up with PLEZi Nutrition — the Public Benefit Company co-founded by the former first lady — as an investor, advocate and brand partner. Speaking with PEOPLE about the partnership, the mom of two says it's important to her and husband Dax Shepard, 49, to model healthy behavior for their kids in all regards.

Asked about a household rule that's stayed in place as Delta, 9, and Lincoln, 11, have grown, Bell tells PEOPLE, "We always make up in front of them if anyone gets snarky or frustrated or fights, which we all do."

She explains, "We do not have the makeup, our conflict resolution, be behind closed doors. Even if at dinner, let's say, one of us is frustrated and is a little snarky and then we go to bed. We'll apologize to each other the next morning."

"Then we will apologize and make amends to each other in front of the kids so that they can see how conflict resolution actually happens," Bell shares.

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Related: Kristen Bell Admits the 'Fatigue Is Real' for Moms on Christmas: 'Do What You Need to Do'

The Frozen star adds that beyond their golden rule of teaching their children about open and compassionate conflict resolution, PLEZi's offerings provide an answer to the "constant impasse" she finds herself at with her kids and their nutrition.

"I was introduced to PLEZi because of Mrs. Michelle Obama," Bell explains. "When I read about what she was doing, I saw this was solving the problem that I had been having with my kids. We're at a constant impasse about how much sugar they want to consume, and it's very worrisome for me."

"I've been a long-time admirer of the former First Lady's work. She is so welcoming and educational about her messaging. She makes it so fun and that's why she's gotten a lot done," she shares.

"I've learned a lot from her. To be honest, it's an honor to help her continue her efforts to make healthier options for kids and families all across America. That's something she pays unique attention to, which I really respect," Bell says.

Replacing trendy sugary drinks helps eliminate "where kids receive a lot of the added sugar in their diet," Bell notes.

"Then, their palates grow up expecting added sugar, which leads to health risks that no one wants to consider. Starting kids early with less sugar in their diet, I think, is brilliant," she continues.

When it came to her own family, Bell recalls, "I was able to buy some PLEZi, give it to my kids and truly the flat that I bought was gone within 48 hours — not just because they drank it but because they were taking it to school to trade it."

The drinks were a hit with her kids and their friends, who, Bell jokes, were trading them in "a big black market trading system on the playground that involves gummy bears and Cheetos."

"The PLEZis were a hot ticket item! They were bringing like six at a time in their backpacks," she remembers. "I settled that down, but I did start putting them in my kids' lunch boxes and they were thrilled. It tastes great, which is big because they will not eat anything they don't think is palatable."

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