Found in a blog:

"Now once for my breakfast I could eat fifty eggs
Now I can't go forty-nine of them
I had muscles hard, like slabs of lard
But alas now I can't see a sign of 'em (alas alas)
I got so thin that the suits that I wear
Fit me nowhere and I don't think it's fair
She don't seem to care if to nothing I shrink
I'm afraid to wash now (you can guess this one)
Lest I slip down the sink...."

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I know Cosmotheka was famous for reviving old music-hall songs. Was this an old music-hall song? If so, does anybody know wrote it, or who performed it originally, or anything else about the song?

If it IS a music-hall song, I might be able to find the sheet-music, if I had more to go on.