Keep an eye on his cholesterol situation - the worst combination is high fat and high carb. But, in this context, what constitutes "high carb"? I don't know. But if you monitor his levels for a while (say every six months or so to see if a trend is forming) for a couple of years you will probably be able to answer that question (at least as far as whether his carb intake qualifies as high or low) for yourselves.