News tagged with nutrients

Related topics: cells , protein , plants , blood vessels , cancer cells

Altruistic suicide in organisms helps kin

The question of why an individual would actively kill itself has been an evolutionary mystery. Death could hardly provide a fitness advantage to the dying individual. However, a new study has found that in single-celled algae, ...

Feb 27, 2014
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Researchers discover secret of bowel movement

High performance athletes like Olympians can push their bodies to optimal potential, but some of the ways the human body actually works is still a mystery. Now McMaster University researchers have cleared up one aspect of ...

Feb 24, 2014
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Are raw food claims overcooked?

Eating only raw foods has emerged as a popular dietary trend. Proclaiming an emotive health message, it is enough to make you think twice before next adding heat to your food. But fear not – on the scales ...

Feb 20, 2014
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Nutrient-based tax could cut nation's medical bills

(Medical Xpress)—To reduce obesity-related disease in America, many policymakers and public health officials have proposed either taxing products that make us fat or taxing individual nutrients in fattening ...

Jan 17, 2014
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How the gut gets its villi

Villi are small epithelial protrusions that serve to increase the surface area of the gut for efficient nutrient absorption. The mechanism of their formation during development was recently revealed by a study published in ...

Oct 14, 2013
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Scientists develop improved method to estimate calories

Mom was right. It's important to chew your food fully. Chewing begins the digestive process of liberating nutrients from their food matrix, and this release is necessary before nutrients are considered "bioaccessible." ...

Sep 17, 2013
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Nutrient

A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment. They are used to build and repair tissues, regulate body processes and are converted to and used as energy. Methods for nutrient intake vary, with animals and protists consuming foods that are digested by an internal digestive system, but most plants ingest nutrients directly from the soil through their roots or from the atmosphere.

Organic nutrients include carbohydrates, fats, proteins (or their building blocks, amino acids), and vitamins. Inorganic chemical compounds such as dietary minerals, water, and oxygen may also be considered nutrients. A nutrient is said to be "essential" if it must be obtained from an external source, either because the organism cannot synthesize it or produces insufficient quantities. Nutrients needed in very small amounts are micronutrients and those that are needed in larger quantities are called macronutrients. The effects of nutrients are dose-dependent and shortages are called deficiencies.

See healthy diet for more information on the role of nutrients in human nutrition.

This text uses material from Wikipedia licensed under CC BY-SA