Physiological essay on Gulliver's Travels: a correction after three centuries.

Gulliver's Travels by Jonathan Swift, published in 1726, was analyzed from the viewpoint of scaling in comparative physiology. According to the original text, the foods of 1724 Lilliputians, tiny human creatures, are needed for Gulliver, but the author found that those of 42 Lilliputians and of 1/42 Brobdingnagians (gigantic human creatures) are enough to support the energy of Gulliver. The author further estimated their heartbeats, respiration rates, life spans and blood pressure. These calculations were made by the use of three equations, i.e., body mass index (BMI = W/H2 ) and quarter-power laws (E∝W3/4 and T∝W1/4 ), where W, H, E, and T denote body weight, height, energy and time, respectively. Their blood pressures were estimated with reference to that of the giraffe and barosaurus, a long-neck dinosaur. Based on the above findings, the food requirement of Gulliver in the original text should be corrected after almost three centuries.