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The components of foods which have these functions are called nutrients. In other words nutrients are vital in keeping a living thing alive and helping it to grow. The diet consists of those foods or mixtures of foods in the amounts which are eaten daily. A good diet provides adequate amounts of all the nutrients, without harmful excesses, from a wide range of foods. Dietary habits are dependent on geographical and cultural traits and vary accordingly. Nutrition is the process by which living things receive the food necessary for them to be healthy. The science of nutrition is a study of all the processes of growth, maintenance and repair of the living body which depend upon the digestion and absorption of food and the study of that food. A nutritionist is an expert on the relationship between food and health and a dietitian is an expert on what one should eat under different conditions.