| Word | Description |
| Ice Cream | Refers to a frozen confection which is made from fat, milk solids and sugar. Some countries permit the use of non-milk-fat and term the product ice cream; while if milk fat is used, it is termed dairy ice cream. |
| Ichthyosarcotoxins. | Toxins in fish. |
| Idli | Refers to a mixture of cooked rice and black gram which is fermented with the aid of mould; eaten in the Far East. |
| IEP | Iso-electric point. |
| IHD | Ischaemic Heart Disease. |
| Illeum | Refers to the last portion of the small intestine, after the jejunum and before the small intestine joins the large intestine or colon. |
| IMP | Integrating Motor Peneumotachorgraph. An apparatus which is used for measuring energy expenditure indirectly from oxygen consumption. It meters the expired air and removes a proportion for analysis. |
| Inanition | Exhaustion and wasting because of complete lack of or nonassimilation of food; a state of starvation |
| Index of Nutritional Quality (INQ) | Refers to an attempt to provide an overall figure for the nutrient cotent of a food or a diet. It may be defined as the ratio between the percentage of the recommended daily amount of each nutrient and the percentage of the RDA (which) for energy. |
| Indian Corn | Maize |
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