The Compendium of Caraka 6.3.140

6.3.140

arising from wasting, wind, fear, anger, passion, grief, or exertion.
When the humor is reduced by fasting, the fire is kindled,
freedom from fever, lightness, and appetite arise in him;
and one should manage him with fasting that does not oppose his vital breath.
Health is rooted in strength, for the sake of which this sequence of treatment [is undertaken]:
fasting, fomentation, time, thin gruel, and bitter taste,