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Nutrition is the selection of foods and preparation of foods, and their ingestion to be assimilated by the body
By practicing a healthy diet, many of the known health issues can be avoided.
The diet of an organism is what it eats, which is largely determined by the perceived palatability of foods.
Dietitians are health professionals who specialize in human nutrition, meal planning, economics, and preparation
They are trained to provide safe, evidence-based dietary advice and management to individuals (in health and disease), as well as to institutions
Clinical nutritionists are health professionals who focus more specifically on the role of nutrition in chronic disease, including possible prevention or remediation by addressing nutritional deficiencies before resorting to drugs
Government regulation of the use of this professional title is less universal than for "dietician."
A poor diet may have an injurious impact on health, causing deficiency diseases such as scurvy and kwashiorkor; health-threatening conditions like obesity and metabolic syndrome; and such common chronic systemic diseases as cardiovascular disease, diabetes, and osteoporosis.