Barry Sears'' Zone Diet is designed to maintain your insulin levels within steady limits - "in the zone" - by eating a careful balance of carbohydrate protein and fat at each meal and snack. The Zone Diet is not a high protein diet rather an adequate protein diet in which (unlike the Atkins Diet) saturated fats are kept to a minimum. The Zone Diet recommends moderate quantities of low-fat protein (about 85g for women and about 115g per day for men). It is not a ketogenic diet as it contains enough carbohydrate to avoid the state of ketosis induced by other low-carb diets. In addition it strongly recommends fruit and vegetables which makes it a healthy diet to follow in the longer term. Portion and serving sizes are restricted with most daily menus containing between 1200-1500 calories.