People with cancer frequently require a high-calorie diet to prevent weight loss. They may also need a diet that is high in protein to prevent muscle wasting. Foods that are high in calories and protein include peanut butter, whole milk, milkshakes, meats, and cheeses.

Some individuals with cancer develop an aversion to fats. High-protein foods with a lower fat content must then be incorporated (low-fat shakes, yogurt, cottage cheese, lean meats).

For the diet to remain well-balanced, eating fruits and vegetables is essential. To increase calories, use more fruit juices or dried fruits rather than whole fruits. Choosing calorie-dense vegetables such as corn, peas, and squashes will also increase the calories in the diet.