The AFFH proposes that the typical symptoms for AN are food restriction, hyperactivity and denial of starvation.
This reflects the operation of adaptive mechanisms that once caused migration in response to local famine conditions.
In pre-historic times, when there is no source of food, starvation begins, where most animals and humans feel intense hunger and begin to search for food.
However, starved individuals with a genetic tendancy towards anorexia say they feel full, are not fazed by starvation and have a new lease of energy.
In the EEA those starving foragers who decieved themselves about their physical condition would have been more confident about moving on to a more favourable environment in terms of food avaliablility, and so would have been more likely to survive.
Therefore, for modern day individuals, among those who are genetically vulnerable to AN, losing too much weight may trigger these ancestral mechanisms.
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