Grass-fed options are better than conventionally raised, advises Malone. The animal’s green diet means the meat has more omega-3s, says Malone. Lean meats (poultry, fish, eggs, and dairy, too) tend to be good sources of complete protein, meaning they contain all 20-plus types of amino acids needed to build and maintain muscle in the body. That’s especially important for cancer patients, says Shah. “When muscle mass is lost, that can lead to fatigue, deficiencies, reduced strength, even impaired physical function,” she says. Your protein needs may vary, but Shah typically recommends about 1.2 grams per kilo of body weight per day, or 82 grams for a 150-pound person.