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Nutrition 101 - Glossary - D

DHADefinition - Docosahexaenoic acid (DHA) is a long-chain omega-3 fatty acid found fatty fish such as salmon, tuna, and mackerel, as well as algae. Relevance - Omega-3 fats are important to heart health and help prevent diseases and conditions that derive from inflammation. DHA is in the same food sources as EPA, but DHA is found in algae while EPA is not.

DiastolicDefinition - Diastolic blood pressure is the bottom number in a blood pressure reading that is a measure of the pressure in the arteries between heartbeats, when the heart muscle is resting. Relevance - Normal diastolic blood pressure is below 80 mmHg. Diastolic blood pressure of 80-89 mmHg indicates pre-hypertension.

Dietary fiberDefinition - Dietary fiber is an indigestible carbohydrate found in (or derived from) plants that can be listed on food labels as soluble, meaning it dissolves in water, or insoluble. Relevance - Dietary fiber is found in fruits, vegetables, whole grains, nuts and seeds and benefits health by adding bulk to the diet, increasing feelings of fullness, aiding digestion, preventing constipation, and lowering the risk of diabetes and heart disease.

Diverticular diseaseDefinition - Diverticular disease occurs when the pockets lining the large intestine experience inflammation or irritation. Relevance - Since it occurs mostly in populations with low fiber intake, a diet high in fiber is employed in the treatment of diverticular disease, which has symptoms like abdominal pain, fever, nausea, gas and bloating.

DPADefinition - Docosapentaenoic acid, or DPA, is an intermediary fatty acid between EPA and DHA. Relevance - Currently, there is no data for DPA consumed alone and its effects on health, since it is not commercialized for human consumption on its own; instead, it is found in fish oils, together with EPA and DHA.