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Different organisms have different food requirements, and they eat different things in order to meet those requirements. Animals that do not eat meat, for example, will have to get certain nutrients like protein from other foods.
The six main types of nutrient are carbohydrates, fats, minerals, protein, vitamins, and water. A macronutrient is a nutrient that needs to be eaten a lot. A micronutrient is needed in smaller amounts but it is still important. Carbohydrates are not needed by the body but most people eat a lot of them. Complex carbohydrates are more nutritious than simple carbohydrates. They take longer to digest. Because they stay in the stomach for longer they leave the person who has eaten them feeling fuller for longer. Protein is needed for building cells. It is found in meat, beans, and eggs. Protein is made of amino acids. Fat is found naturally in some foods. People often eat it in processed foods such as cakes and chocolate. It is high in energy. Omega 3 and omega 6 fats are needed by the body. There are saturated and unsaturated fats. It is recommended that people avoid the saturated type. It has been linked with heart disease. A lot of people think that fat is bad in general. It is controversial.
Most people eat three meals a day. Eating every few hours keeps blood sugar stable.