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Nutrition is the study that deals with food (nutrients) and nourishment.
There are several nutrients that the human body needs to acquire: protein, carbohydrates, fat, vitamins, minerals and water. Other elements include fiber and micronutrients like antioxidants, trace elements, and phytochemicals.
Nutrient-dense foods are those that provide substantial amounts of vitamins and minerals and relatively fewer calories.
The first principle of a healthy diet is simply to eat a wide variety of foods. ://www.wellnessletter.com/html/fw/fwNut01HealthyDiet.html# A poor diet can have an injurious impact on health.
Correct food combinations result in an immediate improvement in health by lightening the load of the digestive organs; better nutrition is assured, and there is better digestion, less fermentation and putrefaction, more comfort, less distress and less gas. So-called food allergies often disappear as a result of proper food combining. ://www.rawfoodexplained.com/digestive-physiology-and-food-combining/the-basis-of-the-food-combining-system.html