As a registered dietitian it is hard for me to see links to sites that push "low carbohydrate" eating. I will try not to get on my soapbox here. Your husband needs to eat a consistent amount of carbohydrate, not a "low" amount. Be aware that "low" carbohydrate foods can be high in fat which does not help in the weight control area.
If he has type 2 diabetes, his best friend can be weight loss of 10% body weight for a big improvement in control of his diabetes. Carbs are not bad, they are your fuel. Your brain and central nervous system needs about 130 grams per day just to sleep, breath, do nothing at all.
All for now or I will go on for hours........