The World Health Organization’s drinking water quality Guideline Value for fluoride is 1.5 mg / litre (WHO, 1993).
WHO emphasises that in setting national standards for fluoride it is particularly important to consider climatic conditions, volumes of water intake, and intake of fluoride from other sources (e.g. food and air).
Nutrient - a substance that provides essential nourishment for growth and the maintenance of life.
Foods are composed chiefly of carbohydrates, fats, proteins, water, vitamins, and minerals. Carbohydrates, fats, proteins, and water represent virtually all the weight of food. Carbohydrates, fats, and proteins comprise 90% of the dry weight of foods.