Energy

Energy

• Can be measured in k/joules or k/calories.
• Foods that provide energy: Carbohydrates(3.75k/cal/g - no more than 11% of dietry energy should come from sugar and 39% of dietry energy should come from starch), Fats(9k/cal/g - no more than 35% of dietry energy should come from fat and 11% should come from saturated fat), Proteins(4k/cal/g), Alcohol(7/cal/g)
• We need 1000k/cal per day to stay alive

How much do we need?

Men - 2500k/cal/day

Women - 2000k/cal/day

What affects how much energy we need?

• Age - elderly need less(more sedentry - less active)
• Pregnancy(extra 200k/cal/day in the last trimester)
• Activity'/exercise/occupation
• Illness - sometimes need more energy but if very inactive it is better to…