Explaining Liquid Diet To Kids?

[melting me 9]

Good day all. I'm going in on July 31, 2012 and am excited to share the experience with you. Does anyone have kids that they have had to explain why they no longer are eating food, but just drinking what my kids call milkshakes at meal time. I have having difficulty explaining why Mummy cooks dinner, but won't eat the salmon. I have tried the approach that Mummy's tummy hurts and it makes it feel better, but its not working.