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Nutrition, the assimilation by living organisms of food materials that enable them to grow, maintain themselves, and reproduce. Food provides materials from which all the structural and catalytic components of the living cell can be assembled. Learn more about nutrients and the nutrient requirements of organisms.
Human nutrition is the process by which substances in food are transformed into body tissues and provide energy for the full range of physical and mental activities that make up human life. Foods supply nutrients that are critical for human growth.
Nutrition is the science of how the body uses food. Calories Food gives the body the energy it needs for everything it does, from repairing damaged cells to sleeping.
Heterotroph, in ecology, an organism that consumes other organisms in a food chain. In contrast to autotrophs, heterotrophs are unable to produce organic substances from inorganic ones. They must rely on an organic source of carbon that has originated as part of another living organism.
The science of nutrition concerns everything the body does with food to carry on its functions. Food provides essential substances called nutrients. The body needs these nutrients to help it make energy; to grow, repair, and maintain its tissues; and to keep its different systems working smoothly.
Nutrient, substance that an organism must obtain from its surroundings for growth and the sustenance of life. So-called nonessential nutrients are those that can be synthesized by the cell if they are absent from the food. Essential nutrients cannot be synthesized within the cell and must be.
Nutrition - Herbivore Diet, Plant-Based Foods, Nutrients: Plant cell walls are constructed mainly of cellulose, a material that the digestive enzymes of higher animals are unable to digest or disrupt. Because of this, even the nutritious contents of plant cells are not fully available for digestion.
Calorie, a unit of energy or heat variously defined. The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. Since 1925 this calorie has been defined in terms of the joule, the definition since.
Food, substance consisting of protein, carbohydrate, fat, and other nutrients used in the body of an organism to sustain growth and vital processes and to furnish energy. The absorption and utilization of food by the body is fundamental to nutrition and is facilitated by digestion. Learn more about food.
Dieting, regulating one’s food intake for the purpose of improving one’s physical condition, especially for the purpose of reducing obesity, or what is conceived to be excess body fat. Dieting plans are based on the reduction of any of the macronutrients (fats, carbohydrates, and proteins) that.