Nutrition Terms | Part 3
Nutrition. This field of study focuses on foods and substances in foods that help animals (and plants) to grow and stay healthy. Nutrition science also includes behaviors and social factors related to food choices. The foods we eat provide energy (calories) and nutrients such as protein, fat, carbohydrate, vitamins, minerals, and water. Eating healthy foods in the right amounts gives your body energy to perform daily activities, helps you to maintain a healthy body weight, and can lower your risk for certain diseases such as diabetes and heart disease.
Polyunsaturated fat is a type of fat that is liquid at room temperature. There are two types of polyunsaturated fatty acids (PUFAs): omega-6 and omega-3. Omega-6 fatty acids are found in liquid vegetable oils, such as corn oil, safflower oil, and soybean oil. Omega-3 fatty acids come from plant sources—including canola oil, flaxseed, soybean oil, and walnuts—and from fish and shellfish.
Protein is in every living cell in the body. Your body needs protein from the foods you eat to build and maintain bones, muscles, and skin. You get proteins in your diet from meat, dairy products, nuts, and certain grains and beans. Proteins from meat and other animal products are complete proteins. This means they supply all of the amino acids the body can't make on its own. Plant proteins are incomplete. You must combine different types of plant proteins to get all of the amino acids your body needs. You need to eat protein every day, because your body doesn't store it the way it stores fats or carbohydrates.
Saturated fat is a type of fat that is solid at room temperature. Saturated fat is found in full-fat dairy products (like butter, cheese, cream, regular ice cream, and whole milk), coconut oil, lard, palm oil, ready-to-eat meats, and the skin and fat of chicken and turkey, among other foods. Saturated fats have the same number of calories as other types of fat, and may contribute to weight gain if eaten in excess. Eating a diet high in saturated fat also raises blood cholesterol and risk of heart disease.
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