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Energy needs (Why we needs energy (produce heat to keep the body warm,…
Energy needs
Why we needs energy
produce heat to keep the body warm
move muscles and be physically active
produce sound
allow body to grow and develop
send messages from brain to nerves
kilocalories (kcal) or kilojoules (kJ)
make chemical reactions take place
1 kcal = 4.3 kJ
Carbohydrates
1g of pure carb gives 3.75kcal/16kJ
foods containing sugars and starch
When eaten they break down for the glucose
some glucose is stored as a quick source of energy
excess is stored as fat to keep us warm and protect organs
Main source of enregy
Fats
fats and oils have the same energy value
excess is stored as adipose tissues under the skin
foods containing visible fats and oils
fats converted to glucose and used as energy without carbs
1g of pure fat gives 9kcal/37kJ of energy
Proteins
1g of pure protein gives 4kcal/16kJ
Body only uses protein if there isn't enough carbs or fats in the diet or body storage
meats, dairy, poultry
Alcohol
1g of pure alcohol gives 7kcal/28kJ
beer, wine, spirits
if drunk regularly excess is turned to fat
Excess energy
Stored in the body as fats
Weight gain
Deficiency of energy
fat stores will be used up
Lose weight
Energy dense food
Foods that contain a high proportion of carbs and fats