eating too much
(from the article `motivation`) ...a small structure lying below the thalamus of the brain, is involved in the regulation of eating. Damage to the ventromedial (lower, middle) area ... ...the hypothalamus appears to be a clearinghouse for satiety signals. Subjects with lesions in this area stop feeding only at an abnormally high ... ...
Ingestion of a greater than optimal quantity of food. ... (12 Dec 1998) ... 
Type: Term Pronunciation: hī′pĕr-fā′jē-ă Definitions: 1. Gluttony; overeating.
hyperphagia (high' pur FAY jee uh) 1. The ingestion of a greater than optimal quantity of food; over eating; gluttony. 2. An abnormally increased desire for food frequently resulting from injury to the autonomic regulatory center in the brain; to gorge.
The dramatic increase in the amount of food that birds consume as they prepare to migrate; because these birds eat more than their body requires in the short term, they store body fat to be metabolized for energy during migration.
'Over eating' by migratory birds during pre-departure fattening; onset driven by hormones.