B1.1: Keeping healthy. Diet and exercise Lesson 1 All Students should be able to describe the constituents of a healthy diet and define metabolic rate. Most Students should be able to describe the relationships between food intake, exercise and fitness. Some students should be able to explain the interactions between metabolic rate and the factors which affect it.

Look at the six food groups. Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. Food group revision Look at the six food groups. Stand with the group you thing best describes your food.

What do you know about your health and things that affect it? Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. What do you know about your health and things that affect it? Collect a workbook We all hear lots of information about our health. Complete the worksheet ‘Health on the line’ to start thinking about what you know.

Unhealthy lifestyle choice Risk Not eating enough fruit or vegetables Not drinking enough water Eating too much fatty food Not taking enough exercise Not getting sufficient food

Unhealthy lifestyle choice Risk Not eating enough fruit or vegetables Lack of vitamins and minerals leading to deficiency diseases and poor growth. Lack of fibre leading to constipation and bowel problems. Not drinking enough water Dehydration that can in extreme cases lead to death. Mild dehydration can affect concentration levels and can lead to headaches. Eating too much fatty food Excess energy intake, leading to obesity. Excessive fats, leading to heart disease. Not taking enough exercise Obesity. Lack of muscle tone. Poor circulation and digestion. Not getting sufficient food Weight loss. Lack of energy.

- Humans are made of lots of cells. Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. Metabolic rate - Humans are made of lots of cells. Each cell carries out lots of chemical reactions including respiration (which releases energy from food) and making proteins. Collectively, these chemical reactions are known as the metabolism. The rate at which these chemical reactions go on is the metabolic rate. Why is your metabolic rate important?

It is not the same as heart rate or breathing rate! Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. Metabolic rate: the rate at which chemical reactions take place in the body. It helps to calculate the amount of energy an individual needs to consume. It is not the same as heart rate or breathing rate!

Factors that affect your metabolic rate

What happens when you exercise? In the exam you will have to construct long written answers. You must include all the key vocabulary and put your ideas into a logical order. List the key vocabulary you would use in your answer. Your muscles contract more to move your limbs. However, muscles need energy to contract. So, muscle cells respire more to release more energy from glucose. To provide this glucose, you need to eat more food. Glucose and oxygen needed for respiration are delivered to the cells via the blood.

Proportion of muscle to fat If you have more muscle and less fat, then your body has a higher metabolic rate than someone who has less muscle and more fat. Males have more muscle and less fat in their bodies; females have less muscle and more fat. This is largely determined by genes. Most males therefore need to eat more than most females. Females can increase their muscle mass by exercise.

Woman doing weight training in a gym. This increases her muscle mass. Monkey Business Images/Dreamestime Woman doing weight training in a gym. This increases her muscle mass.

Do you understand metabolic rate? Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. Do you understand metabolic rate? Complete the worksheet B1a 2.1 Metabolic rate to check.

Energy in food Which type of foods do you think will have the most energy? Give some reasons for your prediction.

How much energy is there in food? Read the practical biology sheet. Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. How much energy is there in food? Read the practical biology sheet. Complete the practical and answer Q 1-3 Extension Complete Q 4 – 6 to find out how energy values would be measured in a hospital laboratory more accurately.

1 cm3 of water has a mass of 1 g. Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. 4.2 is the value of the specific heat capacity of water, in joules per gram per degree Celsius – the number of joules taken to raise the temperature of water by 1ºC. 1 cm3 of water has a mass of 1 g. If the number is more than 1000 J/g, express it as kilojoules (kJ): 1 kilojoule = 1000 joules

Read the online textbook Kerboodle B1.1 Diet and exercise. Be able to describe the constituents of a healthy diet and define metabolic rate. Be able to describe the relationships between food intake, exercise and fitness. Be able to explain the interactions between metabolic rate and the factors which affect it. Homework Read the online textbook Kerboodle B1.1 Diet and exercise. Complete the survey on exercise. Q 1-3 and part A-C. Make sure you use two different groups of people. If using IT give yourself time to do these as you may need to use the LRC at lunchtime. Extension Read the Biofactsheet Exercise : Too much or too little. This has lots of terms you will need to look up, but will impress an examiner if you can use them in your answers.