My husband, who is retired and does most of the cooking and shopping while I work outside the home, is not on board with keto. He lost a good chunk of weight himself with simple “clean eating” and exercise (he’s big into Kettlebells and walks a few miles every day). He doesn’t fear fat, but he thinks I’m crazy to “cut out a food group”–he eats bread, starchy veggies and pasta and some sweets with what he thinks is no problem (I’m not so sure, he’s had a superficial clot in one of his many varicose veins!).
He is mostly very supportive of me. He has seen me lose 75 lbs and improve my health 1000%. He adapts meals for me by separating my portions if carby things are added and always having at least two non-starchy veggie sides with the protein so I have plenty to eat. He doesn’t fear fat, although he thinks things like butter and CO in coffee are crazy (I only did this in my active weight loss phase and lost plenty of weight–I learned not to do it in front of him). He’s thin and fit now. I’m not thin, but I try to keep in mind that he doesn’t contend with severe insulin resistance that I have (PCOS), stressful work environment, and menopause, so it’s not a fair comparison. Occasionally he gets preachy, I just try to find our common ground (we both are passionate about good quality food) and let him rant occasionally. He was really big on telling me there was NO reason to cut out gluten from the diet, until I told him about how I feel on Saturday mornings after eating a little bit of challah (bread) with Friday night dinner–acey and like death warmed over. I don’t feel good when I eat gluten–whether it’s “real” or not, I don’t care. When I finally got that across to him I stopped getting that lecture, at least.
If you and your husband can agree to be supportive of each other, even if he doesn’t agree on your dietary approach, it’s very doable.