DEAR MAYO CLINIC: My niece is living in my home while she is attending college. I've invited her to eat meals with our family, but she typically declines, desiring to eat alone in her room. I'm concerned because she often seems to eat a lot of food at one time, like two sandwiches with two bags of chips or a quart of ice cream. Could this be a sign of an eating disorder? If so, what can I do to help her?

ANSWER: Most people eat too much occasionally. They may fill up an extra plate with seconds at a special event, enjoy another piece of pie at a holiday gathering or eat popcorn until stuffed at the movies. There's no reason to be concerned if this happens occasionally.

But, for some people, overeating can become excessive. It is possible that your niece is suffering from a binge-eating disorder if her excessive eating habits feel out of control and happen on a regular basis. It's the most common eating disorder in the U.S.

People with a binge-eating disorder may feel embarrassed about overeating but have a strong, compulsive urge to continue eating. Like your niece, they often eat alone or in secret because they feel ashamed or guilty about their eating.

Binge-eating disorder is more common in women than in men. People of any age can have binge-eating disorder, but it is most common in younger and middle-aged people. The average age when it first occurs is about 25 years old. A person's size doesn't increase their risk, as the disorder can affect people who are underweight, overweight or at an average weight.

Many people who have a binge-eating disorder have a long history of dieting. They have tried and failed many diets and may have poor body image as a result. While dieting, they restrict calories or specific foods for a while, but then are triggered to binge eat. It's also more common in people who have depression, have a high level of stress in their lives or use food to cover intense emotions.

There are many signs of a binge-eating disorder. Mainly, it's distinguished by a regular occurrence of eating more food than most other people would in a similar situation. Other signs to watch for in your niece include:

-- Eating unusually large amounts of food in a specific amount of time, such as over a two-hour period.

-- Feeling that eating behavior is out of control.

-- Eating even when full or not hungry.

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