To begin, you should know that nutrition refers to the science which is responsible for the study and maintenance of the organism at the molecular level and systematic level. Nutrition ensures that all physiological events are carried out correctly to not only achieve a proper health, if not also have the ability to prevent diseases. Processes at a systematic level relate to digestion, nutrient absorption and metabolism, while the processes at a systematic level, relate to the balance of vitamins, minerals, glucose, amino acids, enzymes, hormones, biochemical mediators, among others. Official site: rusty holzer. Likewise, the nutrition refers to the science that studies the relationship between food and health, especially in determining a diet. Adequate nutrition must cover the proper hydration of the body, as well as the needs of vitamins and minerals, enough dietary fiber intake and energy requirements through the metabolism of nutrients such as proteins, carbohydrates and fats. These latest energy requirements are closely related to the spending by physical activity, as well as diet and basal metabolism. Good nutrition dietary goals, are represented through various graphic resources, one of them being the most popular, the food pyramid.