Source : Webster's Revised Unabridged Dictionary (1913)

Diet \Di"et\, v. t. [imp. & p. p. {Dieted}; p. pr. & vb. n.
   {Dieting}.]
   1. To cause to take food; to feed. [R.] --Shak.

   2. To cause to eat and drink sparingly, or by prescribed
      rules; to regulate medicinally the food of.

            She diets him with fasting every day. --Spenser.