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Webster 1828 Edition

Noun.

A subordinate or local diet; a cantonal convention.

ppr.

Taking food; prescribing rules for eating; taking food according to prescribed rules.

dieting

dieting ‎(plural dietings)

The act of following a diet.
- 1850, John Epps, Homoeopathy and Its Principles Explained (page 133)
  […] they think that diet cures chronic diseases, placed under the homoeopathic physician's care, though, under their care, with all their dietings, these very diseases were so intractable.