Guy Theodore Wrench (3 February 1877 – 8 January 1954) was a British agronomist, nutritionist, and physician.
[3] Wrench was Assistant Master of Rotunda Hospital.
[4][5] Wrench's best known work was The Wheel of Health, a study of the nutritional research of Sir Robert McCarrison and of the Hunza people.
[6][7][8] The book has been described as a "classic of the early organic movement.
[11] Wrench communicated with other early organic pioneers in Britain including Albert Howard and Gerard Wallop.