I assume you are familiar with "freezer bag cooking" such as described at http://www.freezerbagcooking.com ...

Basically, almost anything that you can dehydrate after it is cooked, and rehydrate it with boiling water either in a pot or in a freezer bag.... with no need to wash dishes, if you eat it out of the freezer bag.

You can still find, new and used and in libraries, books full of low carbohydrate recipes. Most of those will be suitable for dehydration... and low carb backpacking.

You should be aware that the American Diabetes Association (ADA) guidelines for both 2008 and 2009 include the use of low carbohydrate diets for weight loss - for periods of up to one year. In the last several years, a number of studies have been published on the advantage of low carb vs low fat as a weight loss diet. A number of times, the ADA has been a cosponsor of such studies.

There are perhaps two or three books on the use of low carb diets to assist in the alleviation of symptoms of Type 2 diabetes and the accompanying lessening of need for medications. Under physician's care, that is.

At any rate, if you can get your hubby to exercise control of the food he puts in his mouth, you have the greatest chance of positive result.