You're right - I did misunderstand what you meant. I was thinking about people who have high cholesterol genetically.You misunderstood what I said regarding genetics. What I meant was that some people are genetically disposed to react to higher intake of saturated fat with increased cholesterol and generally worse health markers (triglycerides, LDL). What you described would be in line with that - such persons might increase their health by reducing saturated fat and increasing carbs. That doesn't mean refined/grain-based stuff - my recommendation would be (sweet) potatoes.
The idea that he will have to cut down on sat fat is pretty frightening. How in the world would I have to start cooking for the two of us? High sat fat is good for me and low sat fat is good for him? So he gets no butter and only lean meat, etc., limited eggs.
If this is true, it's a nightmare. I don't even know what a low sat fat, low carb way of eating would look like. If he even looks at a sweet potato, he gains weight.
And what if it turns out that high cholesterol does not even matter in the first place? So now I'm going to kill myself trying to cut down his sat fat while keeping mine high, and he will be miserable and feeling deprived. And all for nothing.
I hate this. Just when you think that you have finally found the way to eat for the rest of your life, and then the whole thing falls apart.