Leonard Williams | |
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| Born | Leonard Llewelyn Bulkeley Williams 2 October 1861 Castell Deudraeth, Merionethshire, Wales |
| Died | 20 August 1939 (aged 77) London, England |
| Occupation(s) | Physician, writer |
| Spouse | Antonia Beavan |
Leonard Llewelyn Bulkeley Williams (2 October 1861 – 20 August 1939) was a Welsh physician and writer best known for his research on obesity and advocacy of a raw vegetarian diet.