The most important nutrient to consider is sodium and fluid. Sodium will keep water on the body, making it harder to eliminate, which is already a concern for someone with CHF. As long as you are not adding any salt to your Blast, including a variety of fruits and vegetables is a crucial part of a healthy diet. I would double check with your fathers doctor to make sure it will not interfere with any medications and continue to monitor him for fluid retention. If there is any sign of fluid retention, take him to the doctor immediately.