2 EnergyCalories

2 EnergyCalories - 1 Energy& Calories Lecture 2 Dr Quadro Food& Health 400:104 Lecture 2 Energy& Calories 2 Energy How we generate Energy

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Unformatted text preview: 1 Energy & Calories Lecture 2 January 28, 2008 Dr. Quadro Food & Health 400:104 Lecture 2: Energy & Calories 2 Energy How we generate Energy from Food Energy In and Energy Out Input = Food and Calories Output = Metabolism (BMR) and Physical Activity Balance Weight Maintenance Weight Increase Weight Loss Food & Health 400:104 Lecture 2: Energy & Calories 3 The Nutrients in Foods Nutrients: substances obtained from food and used in the body to promote growth, maintenance, and repair. Essential nutrients: nutrients that must be obtained from food because the body cannot make them for itself. Nonessential nutrients: nutrients that the body needs, but is able to make in sufficient quantities when needed; do not need to be obtained from food. Food & Health 400:104 Lecture 2: Energy & Calories 4 The Nutrients in Foods The energy-yielding nutrients: Carbohydrate Fat Protein Energy: the capacity to do work, such as moving or heating something. Calorie: the unit used to measure energy Alcohol is a nonessential nutrient but it does contain calories Food & Health 400:104 Lecture 2: Energy & Calories 5 Provide Energy? 1. Carbohydrate 2. Protein 3. Fat 4. Vitamins 5. Minerals 6. Water YES YES YES NO NO NO The energy- yielding nutrients Food & Health 400:104 Lecture 2: Energy & Calories 6 Energy Input Energy: the capacity to do work, such as moving or heating something Calorie: the unit used to measure energy a kilocalorie is a unit of energy commonly used to express energy value of food Food & Health 400:104 Lecture 2: Energy & Calories 7 Definition of calorie (in Physics) Calorie: the amount of energy necessary to raise the temperature of one gram of water by one degree Celsius In Nutrition one uses calorie=kcal (1000 calories) Food & Health 400:104 Lecture 2: Energy & Calories 8 Food & Health 400:104 Lecture 2: Energy & Calories 9 Calorie Values Calorie value of carbohydrate, fat, and protein… If you know the number of grams of carbohydrate, fat, and protein in a food, you can calculate the number of calories in it. For example, a deluxe fast-food hamburger contains about 45 grams of carbohydrate, 27 grams of protein, and 39 grams of fat (above). Remember this number… Food & Health 400:104 Lecture 2: Energy & Calories 10 Percentage of Total Energy Intake The percentage of your total energy intake from carbohydrate, fat, and protein can then be determined by dividing the number of calories from each energy nutrient by the total calories, and then multiplying your answer by 100 to get the percentage. Food & Health 400:104 Lecture 2: Energy & Calories 11 Calculating Energy Intake Counting Calories If you know the approximate composition of the foods you eat (% carb, pro, fat), and can estimate the weight, you can calculate the number of calories Use the food composition tables Use a diet analysis program Food & Health 400:104 Lecture 2: Energy &...
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This note was uploaded on 04/03/2008 for the course FOOD SCI 104 taught by Professor Hirsch,quadro,wasserman during the Fall '07 term at Rutgers.

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2 EnergyCalories - 1 Energy& Calories Lecture 2 Dr Quadro Food& Health 400:104 Lecture 2 Energy& Calories 2 Energy How we generate Energy

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