| Word | Description |
| Fabricated Food | The food mae from synthetic or processed natural products, e.g., food analogues foods such as meat pies, cakes, other baked foods, pasta and break-fast cereals. |
| Fabrication | A method by which foods are made from processed natural or synthetic material |
| Factor I | Obsolete name for vitamin B6. |
| Factor U | Cabagin, anti-ulcer factor which is reported in cabbage leaves. It is believed to be mthyl sulphonium salt of methionine. |
| Factor W | Obsolete name for biotin. |
| Factor X | obsolete name for vitamin B12. |
| Factor Y | Obsolete name for vitamin B6. |
| Facultative aerobes | Bacteria which grow best in the presence of oxygen but can grow anaerobically. |
| Facultative Anaerobes | Bacteria which grow best in the absence ofoxygen but can grow aerobically. |
| FAD | Flavine adenine dinucleotide |
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