I’m a great believer in low carb/high fat as I’ve lost a lot of weight & got my blood glucose under control with it (I have diabetes). No grains, no sugar, no potatoes (tho I allow myself a small serving of sweet potatoes now & then), no snacks, only 3 meals a day (but now I eat only 2 meals, husband eats 3 with the evening meal being very small).
As someone else mentioned, portion control is important. You can eat lchf but pig out on meat & not lose much weight. I eat about 50-60 grams of protein a day. That’s not grams of protein foods, but the protein that is in the food.
It isn’t expensive to eat this way. I buy the cheapest hamburger, chicken thighs or whole chickens on sale, various roasts on sale. I don’t buy store pork anymore because I find it tasteless, tho I sometimes buy sausage. I eat a lot of eggs. Lots of lettuce (I like it!), celery, green beans (not much cause I don’t like them that much), broccoli, cauliflower, mushrooms on sale, avocados on sale. Walnuts go on salads & are a rare treat. I eat a lot of canned salmon, mackerel, & sardines - I stock up when they’re on sale.
I almost forgot the added fats! Butter, coconut oil, and olive oil are kind of expensive, but you don’t eat all that much of it. Butter makes EVERYTHING taste better.

I do eat a little cream & cheese, but not much as I have problems with dairy. But for weight loss, they should be somewhat limited anyway. Butter doesn’t seem to bother me, but maybe that’s because I never pig out on it.
If you look at
lowcarber.org or
dietdoctor.com you can look at people’s success stories & before & after pictures. You’ll find that we all have different ideas of what low carb is & what works for us. I’m very low carb because of my diabetes, others choose to eat more carbs.
Good luck. Unless your husband is totally on board about losing weight, no diet is going to work.