There have been times during a flare of CFS that I did not feel like eating, but I knew had to build my strength back up. Back in the 1980's when I was in the worst of the flare-ups, I lost a lot of weight and what I turned to was Ensure to take in some calories and nutrition. Since then, I have discovered smoothies. There are hundreds of recipes out there for smoothies - all you have to do is look on the intranet. This is what works for me - I make up my own recipe based on what I have available and what appeals to me.