I think it must refer to this Cautionary Tale by H. Belloc:
The chief defect of Henry King
Was chewing little bits of string.
At last he swallowed some, which tied
Itself in ugly knots inside.
Physicians of the greatest fame
Were called at once, but when they came
They murmured - as they took their fees –
“There is no cure for this disease.
Henry will very soon be dead.”
The family gathered round his bed,
Lamenting his untimely death,
When Henry, with his latest breath,
Cried “Oh my friends, be warned by me
That breakfast, dinner, lunch and tea
Are all the human frame requires!”
With that the wretched child expires.