Net carbs symptoms and conditions

I've known several individuals that have been on prednisone and they changed their diet to counter the side effects of "moon" face & weight gain. In short this is what they did: males, reduce caloric intake to 1500 cal/day by eating five 300-calorie meals a day (every 4 hrs), limiting carbohydrate intake to 30g "net" carbs per day, and limiting sodium intake to 500mg per day. Females, reduce caloric intake to 1200 cal/day by eating four 300-calorie meals per day, limit carb intake to 30g "net" carbs per day, and reduce sodium intake to 500 mg/day. The idea behind the diet is that the frequent small meals will fight off hunger and weight gain while limiting sodium will counter fluid retention.