Carbohydrates Essay

653 WordsJul 10, 20133 Pages
Nutrition begins with food. It is the process by which the anatomy, human nourishes itself by transforming food into energy and body tissues. The science of nutrition concerns everything the body does with food to carry on its functions. Food provides essential substances called nutrients. The body needs these nutrients to help it make energy, grow, repair, and maintain its tissues The term nutrition can also refer to the quality of someone's food choices. If foods eaten on a regular basis provide all the nutrients needed in the right amounts, a person is practicing good nutrition. Good nutrition has many benefits. It can help people feel and look their best. It can also help them stay energetic and healthy, both in the short term and later in life. Three major types of nutrients supply the body with energy, or calories: carbohydrates, proteins, and fats. One gram of carbohydrate provides four calories. The body needs the energy in food to do everything from blinking an eye to running a race. It also needs energy to perform such essential functions as breathing, maintaining body temperature, growing new cells, and even digestive system. The total number of calories needed each day depends on many factors, including a person's age, sex, weight, and especially level of activity If a person takes in more food than is required to meet the body's needs, the excess calories are eventually converted to fat—a form of stored energy found mostly within adipose tissue. That causes weight gain. Eating too little causes weight loss over time, because the body must use stored fat for energy. One pound (0.5 kilogram) of adipose tissue is equal to about 3,500 calories. Maintaining a healthy weight is a balancing act. Food provides energy, and physical activity uses up energy. If weight loss is advisable, experts recommend both reducing one's daily calorie intake and getting more

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