Food chains, also called food webs, food networks and/or trophic networks, describe the feeding relationships between species to another within an ecosystem. Organisms are connected to the organisms they consume by arrows representing the direction of biomass transfer. Typically a food chain or food web refers to a graph where only connections are recorded, and a food network or ecosystem network refers to a network where the connections are given weights representing the quantity of nutrients or energy being transferred.

Take a deep breath, swallow hard, and follow the food you eat on its day-long journey through the digestive system.

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Although humans are omnivores, each culture holds some food preferences and some food taboos. Individual dietary choices may be more or less healthy. Proper nutrition requires vitamins, minerals, and fuel in the form of carbohydrates, proteins, and fats. Dietary habits play a significant role in the health and mortality of all humans.