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Unlike most plants and some bacteria, animals cannot internally obtain energy from sunlight or carbon dioxide. They require an external source of energy, which comes in the form of food. Nutrition is the process by which living organisms ingest, digest, and utilize food for survival and growth. Different organisms have specific daily nutritional requirements, as do different individuals. Each person's daily needs will depend on several factors, such as genetics, level of activity, and age. Personal goals of weight gain or loss can also affect nutritional intake requirements. The study of nutrition focuses on defining the intake needs of individuals and populations.
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