NATIONAL CANCER INSTITUTE / SCIENCE PHOTO LIBRARY NATIONAL CANCER INSTITUTE / SCIENCE PHOTO LIBRARY
Junk food. Packets of junk food in a supermarket shopping trolley. Amongst the unhealthy snacks are packets of crisps, biscuits and chocolate. Junk food is often high in fat, salt and sugar. It is usually poor in vitamins and complex organic compounds which are thought to help prevent cancer.
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