Go for lean protein -- fish, chicken and turkey breast, egg whites. Measure it, weigh it and track it, and I think you'll be surprised how much protein you'll get. These will be low in fat and in carbs.
To get foods without carbs, you'll be relying on fat and protein. Too much of either fat or protein is like too many carbs, not healthy. To get high calorie foods without carbs, you will be eating a lot of fat.
What percent of protein, fat and carbohydrate in your diet did your dietitian recommend? And remember that vegetables contain carbs, so use them as your main source of carbs, with some fruits and whole grains.
A nutrition book may help you. Dietition Becky may be able to recommend some, or check the American Dietetic Association (http://www.eatright.org) to see if they have any recommendations. Also check your library and see if it has any books written by registered dietitians.
Well, most calories come from fats or carbs. LOL so, hard to do high calorie with low fat/carbs. Protein without fat is quite lean. But, of course, there are chicken, pork, steak, fish, beans. To get 'high' calorie you will need to eat large portions of these items.
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