Mindblown: a blog about philosophy.
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Nutrient requirements
The amounts of nutrients absolutely required by an individual to avoid the symptoms of deficiency disease and to optimize health and well-being.
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Null mutation
A mutation that completely eliminates the function of a gene, usually because it has been deleted. A change in DNA or RNA that does not result in any change in the protein product or content of a cell.
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Net protein use
A measure of the biological value of a dietary protein based on the amount of protein retained in the body as a percentage of that consumed.
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Novel food
A food that the consumer has never eaten or a food newly developed by food manufacturers.
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Normal clinical values for blood
Ranges of values for nutrients and metabolites in blood.
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No-observed-effect level
The highest concentration of a substance that may be administered to a test animal in any way without causing that animal to be distinguishable from a control to which the substance is not administered.
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Nontropical sprue
Malabsorption/diarrhea due to localized reaction to certain foods. This ailment affects individuals who have never resided in tropical regions, and although it shares many similarities with sprue, it is actually the adult form of celiac disease. The underlying issue involves the disruption of small intestine function, linked to an intolerance to gluten, which hinders the…
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Noninvasive technique
A medical treatment or procedure that does not involve surgery. X-rays, for example, are in this category of techniques.
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Noninsulin-dependent diabetes mellitus
Outdated term for type 2 Diabetes Mellitus.
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Nonimmunological defense mechanism
One of the defense mechanisms is the digestive tract, which forms a physical barrier against unwanted effects of food. The mucus membrane of the gut forms a protective barrier against penetration of pathogenic microorganisms and allergens. Also, the secretion of certain enzymes and gastric acid (which may lead to degradation of unwanted substances) and the…
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