"Appetite" is defined as the desire to eat, while "hunger" is defined as the physical need for food. Appetite is often mistaken for hunger.
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there are a lot of reasons for loss of appetite. 1. indigestion 2. depression 3. anxiety. 4. the look of unappetising food. 5. bowels have not been cleared for quite sometime. 6.mood swings. 7. grief.
physiological hunger.
Do mean hydroxyapatite? Hydroxyapatite is a major component of teeth and bones.