Being thin may not be the Holy Grail of good health, according to experts in London, because you can still be fat on the inside.

That's because some doctors now think that the internal fat surrounding vital organs like the heart, liver or pancreas -- invisible to the naked eye -- could be as dangerous as the more obvious external fat that bulges underneath the skin, according to an Associated Press report.

Dr. Jimmy Bell, a professor of molecular imaging at Imperial College, London, has scanned nearly 800 people with MRI machines to create "fat maps" showing where people store fat.

He found people who maintain their weight through diet rather than exercise are likely to have major deposits of internal fat, even if they are otherwise slim.

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-- Amanda Barrett, amNY.com