Food and Nutrition What are nutrients? Why do we need them?

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Presentation transcript:

Food and Nutrition What are nutrients? Why do we need them? What is a balanced diet? What is malnutrition?

Food and Nutrition To function, the human body must have nutrients. The nutrients known to be essential for human beings are proteins, carbohydrates, fats and oils, minerals, vitamins, and water. Proteins are made of amino acids, small units necessary for growth and tissue repair. Animal foods such as meat, fish, poultry, milk, and eggs are rich in protein Good plant sources of protein are beans, peas, nuts, bread, and cereals.

Carbohydrates Starches and sugars are carbohydrates, the main source of the body's energy. Carbohydrate-rich foods are also the main sources of protein for most of the world. Rice, wheat, corn, and potatoes are common rich sources of carbohydrates.

Sugars are not essential foods. They provide energy (calories) but no nutrients. For that reason sugar is called an "empty calorie" food. Occasional sweets are not harmful to a healthy, active person, but excessive sugar can lead to tooth decay when eaten between meals, especially in sticky snack foods that cling to the teeth.

Fats and Oils Fats and oils (which are liquid fats) are a concentrated source of energy. Fats in the diet are necessary for good health. They make certain vitamins available for use in the body, they cushion vital organs, they make up part of all body cells, and they help to maintain body temperature. Fats also delay pangs of hunger because a food mixture containing fat remains longer in the stomach.

Nutritionists Distinguish between different types of dietary fats, or fats in food. Saturated fats usually are solid in form and of animal origin. In many typical diets, meat fat is the main source. It is known that saturated fats can raise the level of cholesterol in the blood.

What are antioxidants? What are antioxidants? Antioxidants are nutrients that protect the cells in your body from free radical damage.  Free radicals are produced when your body breaks down food, or is exposed to environmental factors like tobacco or radiation. They also help increase immune function, and can help slow the signs of ageing. How much do we need? This can be hard to identify as many factors play a part, as depending on how much toxicity we are subjected to, the amount of exercise we do and our body composition all has an impact on how many antioxidants we need. Until now it has also been difficult to measure if we are getting enough.

What are antioxidants? How much do we need? This can be hard to identify as many factors play a part, as depending on how much toxicity we are subjected to, the amount of exercise we do and our body composition all has an impact on how many antioxidants we need. Until now it has also been difficult to measure if we are getting enough.