Hi there - sorry to not have replied sooner. I do have a few thoughts...If he is on maintenance, carbs can also come in the form of whole grains - i.e. oatmeal, brown rice, etc. in small quantities at each meal. I think the fruit idea is good as well as starchy veggies (winter squash, sweet potato, etc) You may consider getting the Schwarzbein Principle...if he is a fairly inactive person, he could eat 60 g carb (in the form of fruit, starchy veggies per day and will stop losing weight when his body has reached an ideal composition. The more active he is, the more carbs his body can tolerate.

Hope this helps...

Lisa