Education Phase 3 Diet and health.

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Presentation transcript:

Education Phase 3 Diet and health

A balanced diet Food-based dietary guidelines (FBDG) are simple messages on healthy eating. Most EU Member States have food based dietary guidelines. A balanced diet is based on these guidelines. An unbalanced diet can lead to dietary related diseases.

Malnutrition Having intakes of energy and/or nutrients below or in excess of needs for long periods of time can affect health. This is called malnutrition. Severe under nutrition (having an intake of energy and/or nutrients below what is needed) is rare in the Europe, but can be common in some developing countries. However, under nutrition does occur in Europe, e.g. micronutrient deficiencies.

Under nutrition Worldwide, kwashiorkor and marasmus are two common diseases caused by a lack of protein and energy. Fat soluble vitamins (A, D, E and K) and minerals are stored in the body so it takes time for deficiency diseases to develop. Water soluble vitamins are not stored in the body so low intakes usually lead to signs of deficiency relatively quickly.

Over nutrition Over nutrition is a problem usually associated with developed countries, however over nutrition is also rapidly increasing in some parts of the developing world. The most common over nutrition problem is obesity with too much energy being consumed, or high levels of inactivity.

Risks of malnutrition The risk of malnutrition is increased by: • increased requirements for some nutrients; • restricted range of foods; • reduction in available income; • very low income; • medical conditions; • psychological conditions.

Coronary heart disease Coronary heart disease (CHD) is caused by a narrowing of the blood vessels to the heart. This reduces the flow of blood to the heart. If one of the blood vessels becomes completely blocked, the blood supply to part of the heart stops and that part is damaged. This is called a heart attack.

Risk of CHD The chance of suffering from CHD is affected by many factors. These are called risk factors. Factors that increase the risk of CHD include - - having: a family history of CHD; high blood cholesterol level; high blood pressure; high intake of saturated fats; diabetes. - being: male; older; a cigarette smoker; overweight; Inactive; stressed.

Diet and CHD High intakes of fat, especially saturated fat can increase the amount of cholesterol in the blood. Changes to the diet to reduce the risk of CHD include: • increasing oily fish intake; • reducing salt intake; • increase fruit and vegetables; • decrease alcohol consumption.

Blood cholesterol levels Cholesterol is a type of fat that is needed to make cells in the body function properly. It is produced in the liver and some is also obtained from the diet. Cholesterol is carried around the body in the blood. High levels of cholesterol in blood increase the risk of CHD. The level of cholesterol in the blood depends partly on genetic factors, but can also be affected by diet.

Cholesterol and the diet The level of blood cholesterol is affected by the amount and type of fat in the diet. High intakes of saturated fatty acids, and of total fat, can increase the amount of cholesterol in the blood, and therefore increase the risk of CHD.

Obesity If a person regularly consumes more energy from food and drink than they need, they will start to gain weight, eventually becoming overweight. Extra energy from food and drink is stored in the body as fat. There are a range of weights which are considered healthy for a given height. A person who is very overweight is obese. Obesity is becoming increasingly common in North America, Australasia and Europe, and is rapidly rising in some parts of the developing world.

Problems associated with obesity People who are obese are more likely to suffer from coronary heart disease, type 2 diabetes, arthritis, high blood pressure and some types of cancers. Being active is important in maintaining a healthy weight.

Bone health Calcium is important for strong bones. Vitamin D is needed for calcium to be absorbed from food. Osteoporosis is a disease where bones become weak, brittle and break easily. It is caused by severe losses of calcium. It is most common in men and women over the age of 55.

Bone health Healthy bone is strong and does not break easily. During childhood, adolescence and early adulthood, calcium and other substances are added to the bone. This makes it stronger. After the age of 30-35, bone loss begins. After the menopause women lose bone at an increased rate.

Anaemia The mineral iron is vital for making red blood cells. Iron from the diet forms haemoglobin, which carries oxygen in the blood. If the body’s store of iron is low and there is too little iron in the diet, the symptoms of iron deficiency anaemia will start to develop (e.g. tiredness, lethargy, shortness of breath).

Blood health Iron from animal sources is more easily absorbed than iron from plant sources. Vitamin C increases absorption of iron from plant sources. It is important that the diets of babies and young children contain foods rich in iron. Iron requirements increase during adolescence because of growth and for girls at the start of menstruation.