Do you hate your coworker because she eats whatever she wants and never works out yet still is thin? Well don't because chances are she is TOFI.

TOFI stands for "Thin on the Outside, Fat on the Inside." New studies are finding the fat deposits these so called Tofis carry are hidden in the white fat that lies around their vital organs, streaked through their underused muscles and wrapped around the heart. This hidden fat (rather than the fat lying in dimples underneath the skin) that can only be seen in high-tech MRI scanners is what sends out chemical signals, potentially leading to insulin resistance, Type 2 diabetes and heart conditions.

Consider this: Sumo wrestlers have a BMI of 56 and eat up to 5,000 calories a day, but they have very little internal fat. Surprisingly they also have low cholesterol, low insulin resistance and a low level of fatty acids. This seems to be due to the fact that their fat is all stored under the skin, on the outside.

Research is still being done on TOFI but as of now the best way researchers have discovered to combat the dangerous hidden fat is to eat a healthy diet with lots of dietary fiber. As always, exercising is always a good addition for anyone looking to be healthy, overweight or not.