Foods are the basic needs of life. Without them, everyone would starve. In the years before BC, food was considered a scarce resource since humans did not have complete knowledge at that time. Now we could find food everywhere around us. There isn't an area that isn't filled with food. Nowadays, humans are full of ideas that they could even create artificial foods. The presence of foods is excessive in human life, but are they all considered healthy foods containing essential nutrients? What are the different types of nutrients? How do we know how much we are supposed to eat? Many topics will be covered in this essay. “Nutrients are the nutritional components of food that an organism uses to survive and grow. Macronutrients provide most of the energy needed for an organism's metabolic system to function, while micronutrients provide the cofactors needed for metabolism to function properly” (Nutrient. (March 24, 2014). Nutrients are divided into several parts such as carbohydrates, proteins, fats, vitamins, minerals, water and fiber each have their own role in the human body “The role of carbohydrates is to provide energy, as they constitute. the body's main source of fuel, necessary for physical activity, brain function and organ function" (healthy diet. (nd). "Protein is an important part of skin, muscles, organs. and glands. Proteins are also found in all body fluids except bile and urine” (Protein in Food: MedlinePlus Medical Encyclopedia (undated). “The lipid stores in your body function as an energy reserve to fuel your essential bodily functions, like heart rate and breathing, when you go for a long period of time without eating. formation of your cell...... middle of paper ......(Complete protein. (March 24, 2014)) “Complete proteins could be obtained from meat, fish, poultry, cheese, eggs, yogurt and milk” (Incomplete or complete proteins. (nd). Finally, there are 2 classifications of minerals, macro-minerals and micro-minerals. “Macro minerals are present in greater quantities in the animal's body or needed in greater quantities in the diet Macro-minerals include calcium, chlorine, magnesium, phosphorus, potassium, sodium and sulfur” (The difference between macros. and micro-minerals (nd). Compared to macro-minerals, "micro-minerals are often called trace minerals, meaning that they are present in small amounts in the body or needed in smaller amounts in the body." Animal feed Microminerals include chromium, cobalt, copper, fluorine, iodine and iron. , manganese, molybdenum, selenium and zinc” (The difference between macro and micro minerals. (nd.).