Eshwar,

Your dad has an advantage having a very knowledgeable caregiver so let's get him on the right track nutritionally so his body has the tools for repair.

I'm on a mostly liquid diet and I "eat" 6x per day. I use a protein powder in three of those meals, you can add it to a can of Ensure or Boost and thin it out with water or milk. The other 3 meals I focus on fruits and veggies and calories. I'll mix some yogurt (probiotics) and fruit juice (fresh as I use a juicer) with peanut butter when I need sweet, or juice veggies(broccoli,garlic,tomato,carrots,spinach etc...) and then add olive oil for good fat and calories when I need savory.

That's a quick and dirty version of my diet, I "rarely" eat solids anymore unless I'm really feeling nostalgic.

Tell your dad we are pulling for him, keep your chin up my dear friend.

Eric