Cancer patients should focus on a balanced diet rich in fruits, vegetables, whole grains, and lean proteins. Consuming a variety of colorful fruits and vegetables provides essential vitamins, minerals, and antioxidants that can help combat oxidative stress and inflammation. Whole grains such as brown rice, quinoa, and whole-wheat bread offer fiber and nutrients that support digestive health. Lean proteins, including poultry, fish, legumes, and tofu, are crucial for muscle repair and immune function.