The 43-year-old model has revealed she was diagnosed with proctitis - which causes uncomfortable bowel issues - and it means she now has to be "really specific" about what she eats so she's changed her diet to cut out foods such as eggs which could trigger inflammation.
"This is what I do for me because I've had my blood taken and I've had issues for, oh my goodness. I had proctitis. It's an inflammatory bowel thing, so I have to be really specific about what I eat," she told Australia's Stellar magazine.
"Certain things inflame me. That doesn't mean it inflames everyone. For instance, my kids eat eggs. That's amazing, right?"
Kerr said she's started eating meats such as bison and venison because they don't cause her problems but she's not forcing her kids, Flynn, 15, Hart, eight, Myles, seven, and Pierre, two, to change their diets as well.
"My kids are not eating bison, but I am because that's what is working for me. That's why I've placed such a huge emphasis on my health," she said.
"When I'm feeling my best, I give my best as a mother, my best to my work, my best as a friend.
"The most important thing is to be honest and truthful with what works for you, right? What works for me doesn't necessarily work for everyone else."
The model previously opened up about her diet during an appearance on the Let's Be Honest with Kristin Cavallari podcast in August.
"I've been drinking noni juice since I was 13. I'm 43 - (that's) 30 years! Noni juice is a superfood, superfruit. It originates from Tahiti, but it can grow in other parts of the world like Australia too."
Kerr says she only eats meats that "aren't mass-produced" and she swaps out bread and rice for vegetables.
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