Hi cattie, well done to you for supporting your oh. We all, on here, appreciate how much hard work this diet can be, thinking, planning, shopping, cooking and so on. You too will benefit even if you dont have to lose weight or improve an illness. You dont say why your husband is on this particular plan, does he have any underlying problems with his health or just overweight.
There are things that can be had on this diet that I consider treats. For example, a glass of red wine at the weekend. Also I eat 1 square of really dark chocolate (70% or more) every now and then. It rather depends on what he likes to eat and can he control what he eats once he has something – i.e. can he stop eating. For me having succulent roast chicken (not the shop bought chemical stuff) in the fridge to pick on. A small square of cheese every now and then and my favorite is berries. If he is looking for stuff like pastries, cakes, pies etc then limit the amount in the house and make sure there are alternatives to eat. Let us know more about his circumstances and that will decide on whether it would do no harm to have a small treat now and then.