Should I cook at my MIL's house

I like to eat healthy and feed my kids healthy foods. When we visit my MIL, she wants to cook all of the nostalgic meals that she made for my husband when he was little, and he likes this too. The foods are not healthy and I don't like them. When she comes to my house, I want to cook but she also controls what we all eat as a family at my house. How should I handle this, my husband is very defensive about his mom.

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