The food products are processed to recover liquid fat which is used in the manufacture of bio-fuels.

BBC: Leftovers to light London Savoy

Soon they were soaking reeds into liquid fat and burning them for light.

FORBES: No. 14 The Candle

In the scullery she found several fat demijohns of brown liquid bubbling through airlocks.

BBC: CLOUD ATLAS, BY DAVID MITCHELL

That means filling up your plate with lean protein, including chicken, fish, fat-free dairy products and liquid oils.

CNN: Vital Signs health tips