Fat tissues do not store all fat. So called 'white' cells store fat in order to maintain energy supply while 'brown' cells metabolise fat to maintain a stable body temperature. Brown cells are abundant in babies but decrease in number with maturity into adulthood.

A third type of fat cell, 'beige' cells, have recently been found in humans and mice, and have shown to function much like brown cells. Beige cells also reduce in number as people approach middle age and without these metabolising cells, fat continues accumulating for decades without ever being used.

The team fed a group of mice fatty food, and other groups fatty food with fish oil additives. The mice that ate food with fish oil, they found, gained five-10 percent less weight and 15-25 percent less fat compared to those that did not consume the oil.

The team also found that beige cells formed from white fat cells when the sympathetic nervous system was activated, meaning that certain fat storage cells acquired the ability to metabolise.

"People have long said that food from Japan and the Mediterranean contribute to longevity, but why these cuisines are beneficial was up for debate. Now we have better insight into why that may be," explained Kawada in a paper which appeared in the journal Scientific Reports.

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