Being thin on the outside doesn?t mean you're not fat on the inside, according to a team of medical researchers in London who have been studying internal fat surrounding vital organs like the heart, liver or pancreas. Dr. Jimmy Bell, a professor of molecular imaging at Imperial College, London, who has been leading a team making ?fat maps? with MRI machines since 1994, says the notion of ?being fat? needs to be redefined. Dr. Louis Teichholz, chief of cardiology at Hackensack Hospital in New Jersey, reacted to the research results in an Associated Press interview printed in the MetroWest Daily News in Framington, MA. Dr. Teichholz made this point: "Just because someone is lean doesn't make them immune to diabetes or other risk factors for heart disease.? The good news: The inside fat can be burned off through exercise and eliminated by improving your diet.