Your husband needs to make some lifestyle changes. You know this already, but he needs to eat less and exercise more. The problem is, he can't make those changes alone, because he has a marriage to maintain. Any lifestyle change the husband makes must also be made by the wife, or it won't "stick". That is, you can't ask him to lose weight unless you are determined (yourself) to lose weight, also.
Example...let's say you both enjoy eating ice cream. That could be a large part of his weight gain. But if he decides to give up ice cream, it won't do any good unless there is NO ice cream in the house. That means, you don't eat ice cream, either.
Another example. Let's say that he decides to wake up early every morning to take a walk for 2 or 3 miles, or whatever he can handle on a daily basis...
Unless YOU go walking with him, on the same schedule and the same route, he will quickly lose interest in that activity. To make matters worse, whatever YOU are doing while he's exercising will discourage him. Like, he goes for a walk for 3 miles to come home to find you sound asleep...
Now he's wishing he could have more sleep. So the next morning, he decides to NOT get up early to go walking.
Or he comes home to find you eating a very high-calorie and high-fat breakfast that you cooked while he was walking. Now he's going to eat so many calories that it won't matter that he went walking.
Do you see my point? If you want him to be healthy, you need to be healthy with him. Don't tell him to eat right. EAT RIGHT, and serve him exactly what you are eating. Don't tell him to exercise. EXERCISE, and take him along with you.