Definition of what are calories in food
What are calories in food? Food energy is determined in large Calories. Calorie is a unit of heat. The small calorie is the heat necessary to increase the temperature of 1 gram of water from 14.5° to 15.5° C. A large Calorie equals 1000 small calories.
What are calories in food metabolism?
Food metabolism is expressed by chemical reactions of energy transformation for cell support and reproduction. All living organisms depend on metabolic activity maintaining them from the beginning to the end of life. Metabolic reactions are activated and controlled by particular cell enzymes. Each biochemical reaction is harmonized with many other reactions.
What are calories in food nutrients?
Living organisms depend on energy drawn from food. Essential nutrients such as proteins, carbohydrates, and fats are synthesized in plants. These nutrients are stored in tubers and roots being utilized in case of need. A large Calorie is used to express energy content in foods of plant and animal origin.
What are calories in food of different origins?
Carbohydrates have a value of 4.1 Calories per gram, proteins give 5.7 Calories per gram, and fats produce 9.3 Calories per gram. Organisms use foods of various origins to satisfy their particular requirements. Plant seeds contain significant reserves of energy owing to high content of oils. A sugar maple possesses abundant storages of carbohydrates in the form of sucrose and is grown as a source of sugar extracted from the sap.
What are calories in food for animals and humans?
When foods containing carbohydrates and fats are metabolized by the body, they release energy. The amount of Calories in the food can be determined by combustion in the laboratory calorimeter. Animals and humans produce the heat energy and the work energy. Muscular activity consuming 1 calorie for work produces 4 calories of heat. However, animals and humans do not waste heat in vain. Heat maintains body temperature in normal range and creates favorable conditions for metabolic reactions. The case is that at low temperatures metabolic reactions are too slow and cannot support body functions. Living cells are also able to transform energy and are extremely adaptable from this standpoint. Living organisms can even consume their own tissues if they exhaust usual energy stores.
What are calories in food recommended?
Recommendations are grounded on the amount of required nutrients. Nutrient and energy requirements depend on age, gender, physical activity, health and genetics. Scientists offered special guidelines for different foods. Nutritional data can be found on standard food labels for consumers.
Particularities of what are calories in food
In developed countries humans get adequate amounts of nutrients with diets. A balanced diet presupposes the correct amount of calories and the accurate nutrient proportions. However, some people do not keep to healthy body weight. Such people must limit the calories and fat. One third of energy should be obtained from fat. Imbalanced diets increase the risk of heart disease, stroke, obesity, diabetes, and cancer.
Distribution of what are calories in food
Approximately 50 % of energy must be obtained from carbohydrates in bread, potatoes, and pasta. These foods are also a valuable source of dietary fiber. Fiber is good for bowel and helps reducing the risk of heart disease and cancer. Fruit and vegetables are as well valuable for health.