I have the same situation -- thin husband with high cholesterol and triglycerides and high blood pressure. Unfortunately, I have not been able to persuade my husband to try low carbing, although he has cut a lot of the sugary junk out of his diet.

Have you considered looking at some of the other lowcarb plans for your husband. Schwarzbein is very interesting for people who need to get healthier but don't necessarily need to lose a lot of weight. You also may want to look at the new Atkins for Life book. I haven't read it yet, but I understand it is directed at people who don't necessarily want to lose weight, but who have other health problems that are diet related.