Definition:

The process of providing or obtaining the food necessary for health and growth.
Credit: Oxford (www.lexico.com).

Another definition from Medical News Today: https://www.medicalnewstoday.com/:
Nutrition is the study of nutrients in food, how the body uses them, and the relationship between diet, health, and disease. Nutritionists use ideas from molecular biology, biochemistry, and genetics to understand how nutrients affect the human body. Nutrition also focuses on how people can use dietary choices to reduce the risk of disease, what happens if a person has too much or too little of a nutrient, and how allergies work. Credit: Medical News Today (www.medicalnewstoday.com).

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