Ordering the "catch of the day" may help keep your waistline from expanding every time you eat a french fry.

According to a new study, adding more fish to your diet or taking fish oil supplements could counteract the effects of a greasy diet and help you shed some weight.

Swedish researchers at Sahlgrenska Academy in Gothenburg arrived at this conclusion after cooking up two different menus for mice in their labs.

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Some of them ate lard-based meals, while the others dined on meals rich in fish oil. The two different diets allowed for different kinds of microbes to flourish inside each respective group of mice.

The lard-based diet promoted growth of a bacteria called Bilophila, which has been linked to inflammation. Mice eating the fish oil diet saw higher levels of a different bacteria called Akkermansia muciniphila, which has been linked to improved metabolism and slowing weight gain.

The results suggest that microbes associated with fish oil may benefit humans by reducing weight gain from fatty foods.

Their research, published in the journal Cell Metabolism, provides yet another reason to focus on getting a regular intake of fish oil.

(READ more at Pulse Headlines) — Photo by Susanne Nilsson, CC

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