AQA Core Biology (B1) - 1.1 - Keeping Healthy

AQA Core Biology (B1) - 1.1 - Keeping Healthy

1. Diet & Energy

   • Balanced Diet
     • Carbohydrates
       • The main source of energy
     • Fats
       • One Gram of FAT releases almost TWICE as much energy as 1 gram of protein or carbohydrates
       • Energy & Making New Cell Membranes
     • Proteins
       • For Growth (Making New Cells) & Repair. Also a minor supply of energy
     • Vitamins & Minerals
       • Keeping Healthy
       • Needed in small quantities for good health
     • Fibre (Roughage)
       • Keeps the digestive system working well
       • Prevents chances of getting bowel cancer
     • Water
       • Needed to survive
       • Transport vital nutrients
     • Eating the correct amounts of all of the food groups each day
   • Energy Needs
     • People doing manual work, or alot of exercise, need to eat a lot more energy-rich foods than people who don't exercise as much
       • Different people have different METABOLIC RATES
         • The rate at which chemical reactions take place in your body
         • Generally
           • Men have faster metabolic rates than women
           • Younger people have faster metabolic rates than older people
           • The greater the proportion of muscle to fat in the body, the higher the metabolic rate is likely to be
         • Can be affected by your genes - inherited from your parents