2006-07-02 22:24:18 · 4 answers · asked by Anonymous in Health ➔ Diet & Fitness
The energy value of a particular food is calculated from a knowledge of macronutrient composition and the modified Atwater factors for these macronutrients.
Fat is the most energy-dense macronutrient, followed by alcohol, protein and carbohydrate. For example, one double Scotch has about twice as many kilocalories as a glass of soft drink; a glass of full-cream milk has about twice the kilocalories as a glass of soft drink or of skimmed milk Dietary fibre or roughage is not usually ascribed an energy value for humans, but it is now recognized that some dietary fibre components are used as fuels by the microflora (bacteria) of the gut, especially in the large intestine. Some of the products of dietary fibre digestion may provide energy for the gut lining and some may actually be absorbed for general bodily metabolism. Vitamins and elements have no energy value.
Energy requirement can be thought of as the amount needed to maintain the basic processes of life at rest, that is, basal metabolism, plus the amount needed for physical activity under a variety of circumstances. Body weight is an important factor in determining how much energy we need, since more energy will be needed to sustain and move a greater body mass.
The word 'energy' has been used here in the nutritional sense of 'provider of fuel' and not in the sense of providing zest and vitality. High-energy foods do not necessarily affect how we feel. Food products are sometimes promoted as mood-changers on the basis of their energy value, but this is simply a reflection of the double-meaning of 'energy'.
The body needs carbohydrates mainly for energy. The best sources of carbohydrates are whole grains such as oatmeal, whole-wheat bread, and brown rice. They deliver the outer (bran) and inner (germ) layers along with energy-rich starch. The body can't digest whole grains as quickly as it can highly processed carbohydrates such as white flour. This keeps blood sugar and insulin levels from rising, then falling, too quickly. Better control of blood sugar and insulin can keep hunger at bay and may prevent the development of type 2 diabetes.
2006-07-02 23:19:16 · answer #1 · answered by lindakflowers 6 · 0⤊ 0⤋
Anything high in carbohydrates is a high energy food. Of course, carbs are really only good for short term energy (ie. right before running a race). If you want energy that will last a long time, you want protein. Protein feeds your muscles more slowly, but the results are long term.
2006-07-03 05:30:26 · answer #2 · answered by Brandon L 1 · 0⤊ 0⤋
- Important Basics Food Charts -
1: E N E R G Y:
KILOJOULES / KILOCALORIES
Energy has traditionally been expressed as calories or kilocalories. More recently, the units of energy have been changed to kilojoules. There are 4.2 kilojoules in 1 kilocalorie. For convenience, both units are shown on the chart. Someone having 2000 kilocalories each day would be having 8400 kilojoules, also known as 8.4 megajoules. The energy value of a food indicates its value to the body as a fuel. This may be less than the heat value obtained experimentally by 'burning' the food outside the body in what is called a 'bomb calorimeter'. After a food is ingested, some of its energy may be 'lost' during digestion and metabolism. Although the energy value of some foods has been found by combustion in a bomb calorimeter, more usually the amounts of the macronutrients - fat, protein, carbohydrate and alcohol (ethanol) - in a food are taken into account when assessing the total energy value of the food. The energy value for each macronutrient must be known, and an allowance made for body losses. The first system for giving energy values to the macronutrients was described by Dr W. O. Atwater in 1899. Modified, the 'Atwater factors' are:
kilojoules per gram kilocalories per gram
Fat
Alcohol
Protein
Carbohydrate
37
29
17
16 9
7
4
4
Important Basics
Energy
- Water
- Dietary Fibre
- Protein
- Phenylalanine
- Carbohydyrate
- Fat
- Cholesterol
- Saturated and Unsaturated Fat
- Alcohol
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The energy value of a particular food is calculated from a knowledge of macronutrient composition and the modified Atwater factors for these macronutrients. The energy values shown in the chart have been obtained with this approach.
Fat is the most energy-dense macronutrient, followed by alcohol, protein and carbohydrate. For example, one double Scotch has about twice as many kilocalories as a glass of soft drink; a glass of full-cream milk has about twice the kilocalories as a glass of soft drink or of skimmed milk Dietary fibre or roughage is not usually ascribed an energy value for humans, but it is now recognized that some dietary fibre components are used as fuels by the microflora (bacteria) of the gut, especially in the large intestine. Some of the products of dietary fibre digestion may provide energy for the gut lining and some may actually be absorbed for general bodily metabolism. Vitamins and elements have no energy value.
Energy requirement can be thought of as the amount needed to maintain the basic processes of life at rest, that is, basal metabolism, plus the amount needed for physical activity under a variety of circumstances. Body weight is an important factor in determining how much energy we need, since more energy will be needed to sustain and move a greater body mass.
You should refer to the charts of energy requirement according to age, sex and level of physical activity (Figures 11 and 12), together with the energy values of foods. However, remember that there is a great deal of individual variation in the efficiency with which ingested food energy is utilized for work by the body. If your body is relatively inefficient in its use of food energy, loss will occur in faeces and by relatively more heat production.
The word 'energy' has been used here in the nutritional sense of 'provider of fuel' and not in the sense of providing zest and vitality. High-energy foods do not necessarily affect how we feel. Food products are sometimes promoted as mood-changers on the basis of their energy value, but this is simply a reflection of the double-meaning of 'energy'.
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ENERGY Food Charts:
ENERGY:
beverages
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BEVERAGES
Energy kJ/kcal
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ENERGY:
cereals/cakes
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CEREALS, BISCUITS, CAKES, DESERTS
Energy kJ/kcal
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ENERGY:
egg & cheese
dishes
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EGG AND CHEESE DISHES
Energy kJ/kcal
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ENERGY:
fats/oils
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FATS AND OILS
Energy kJ/kcal
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ENERGY:
fish/seafood
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FISH AND OTHER SEAFOODS
Energy kJ/kcal
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ENERGY:
fruit
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FRUIT
Energy kJ/kcal
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ENERGY:
meats
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MEAT AND MEAT PRODUCTS
Energy kJ/kcal
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ENERGY:
milk products
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MILK AND MILK PRODUCTS
Energy kJ/kcal
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NUTS
Energy kJ/kcal
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SAUCES AND CONDIMENTS
Energy kJ/kcal
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SOUPS (as served)
Energy kJ/kcal
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ENERGY:
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SUGARS, JAMS AND SPREADS
Energy kJ/kcal
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SWEETS
Energy kJ/kcal
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VEGETABLES
Energy kJ/kcal
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2006-07-03 05:31:57 · answer #3 · answered by Linda 2 · 1⤊ 0⤋
It depends on what type of energy food you seek, but sugar is really high in "energy"
2006-07-03 05:27:50 · answer #4 · answered by huskernurse 2 · 0⤊ 0⤋