I was on a dietitian prescribed diet once and lost almost 40 lbs in six months. I was permitted up to 60 g net carbs per day, and I thought that was a very low amount of carbs considering that my lifetime carb consumption was extremely high, comparatively. I can't imagine myself eating many fewer than 60 g net carbs per day. My dietitian called the diet she prescribed high fat, but compared to Atkins it was fairly low fat.