Pre-heat the oven to 180°C / 350°F / Gas Mark 4. Cook macaroni in lightly salted boiling water and drain. To make the cheese sauce: Melt the margarine in a saucepan. Add flour and cook over a low heat for 1 minute, stirring all the time. Remove from the heat and cool slightly.
I have been reading a case report by Kraft, Westman, 2009 of a 70 year old obese, Caucasian female who was suffering from Schizophrenia since the age of 17. Her symptoms included paranoia, hallucinations (auditory and visual), and many hospitalizations for psychosis and suicide attempts. Her daily diet included "egg and cheese sandwich, diet soda, water, pimento cheese, barbecued pork, chicken salad, hamburger helper, macaroni and cheese, and potatoes." Instead, she was asked to follow a low carbohydrate diet of: "unlimited meats and eggs, 4 ounces of hard cheese, 2 cups of salad vegetables, and 1 cup of low carbohydrate
vegetables per day. This diet restricts carbohydrate intake to fewer than 20 grams per day." The diet was also grain free.