How to Lose Weight. Christine Michael
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Название: How to Lose Weight
Автор: Christine Michael
Издательство: HarperCollins
Жанр: Здоровье
isbn: 9780007563548
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must know
Being underweight
Being underweight (BMI of 18.5 or less) is a health hazard, and can lead to loss of fertility in women, lower resistance to infection, osteoporosis and a lack of vital vitamins and minerals. Extreme loss of weight can also indicate eating disorders, such as bulimia or anorexia nervosa, which require careful and specialized treatment.
Why weight is to blame
It is easy to imagine why being overweight can cause certain health problems – breathlessness or pain in weight-bearing joints such as the knees and lower spine. Some medical conditions, however, have a more complex relationship with weight. As we saw earlier, a BMI of between 18.5 and 24.9 is thought to be within the desirable ‘healthy’ range, so, in theory, any weight gain that takes your BMI above 25 is potentially a risk to your health. It is generally accepted though that the risk of serious conditions, such as diabetes and heart disease, rises significantly at a BMI of around 27 or above.
So why worry if you are only a few pounds overweight? The trouble is that extra pounds can have a habit of creeping up on us unawares. So if your BMI hovers around the 25 level, it makes sense to keep your weight stable or to lose a few pounds. And, of course, if your BMI is unhealthily high, slimming will quickly bring big benefits.
Weight-related health problems
Below is some background information to the most common weight-related health problems that may develop.
Coronary heart disease
One of the key aspects of heart health is the ability of the heart and its surrounding arteries to circulate blood strongly and freely round the body. Being overweight can damage heart health in a number of ways, mainly by raising the level of unhealthy fats, such as low-density lipoprotein (LDL) cholesterol and triglycerides, in the blood. A build-up of these fats over time can narrow or clog the arteries, a condition known as atherosclerosis, and this in turn can lead to chronic diseases such as angina, or acute conditions such as a heart attack.
Make the most of seasonal food like berries to give your health a boost.
Change the odds on good health in your favour by eating well.
High blood pressure, which is three times more common among overweight people than slim people, is also a big risk factor. And even where there are no problems with blood fats or blood pressure, just carrying excess weight, especially around the middle, seems to increase the likelihood of developing heart disease.
must know
Body fat
This is not always the bad guy! We need a certain amount of body fat to protect and insulate our organs; it also has a role in producing certain beneficial hormones, and protects against loss of bone mass (osteoporosis).
Type 2 diabetes
This condition affects 1.4 million people in the UK and possibly a further million who have not had their condition diagnosed, according to the charity Diabetes UK. Type 2 diabetes is sometimes called ‘late onset’ because, unlike type 1, it tends to develop in adult life, and being overweight is a big risk factor: over 80 per cent of adults with type 2 diabetes have a BMI of more than 25 when they are diagnosed. Children and teenagers are also being diagnosed more frequently as obesity rises.
Type 2 diabetes is caused when the insulin that the pancreas produces in the body fails to control blood sugar properly (insulin resistance) or when the pancreas fails to produce enough insulin for the body’s needs. Research shows that excess weight, especially around the waistline, increases insulin resistance so the pancreas has to work harder to get the same effect. Having too much sugar in the blood causes symptoms such as excessive thirst, blurred vision, fatigue and passing urine frequently. Having too much insulin in the blood causes other problems, such as increasing blood pressure and raising the level of various fats in the blood. This puts people with type 2 diabetes at high risk of heart disease and stroke; untreated diabetes can also cause serious damage to the eyes, kidneys, nerves and circulation.
must know
‘Syndrome X’
Also known as metabolic syndrome, this term refers to a collection of symptoms that include evidence of insulin resistance, fat carried around the middle (‘apple’ shape), high blood pressure and raised levels of unhealthy fats (LDL cholesterol and triglycerides) in the blood. Together, they represent an increased risk of heart disease, diabetes or stroke. Some diets claim to have specific benefits for people with Syndrome X, but any healthy eating and exercise programme, leading to a five or 10 per cent initial weight loss, should reduce all these symptoms without any special diets being needed.
Cancers
Cancer Research UK states that after smoking, obesity is the second biggest preventable cause of cancers. The links between being overweight and cancer are complex and not all of them are fully understood.However, it seems that obesity can unbalance the function of certain hormones, which could increase the risk of hormonally-sensitive cancers in women, such as cancer of the uterus, ovaries, cervix and endometrium (uterus lining). Excess abdominal fat (the ‘apple’ shape) has also been linked to a higher risk of breast cancer in women after the menopause. Cancers of the digestive system, such as colon or rectal cancer, may have more of a link to a high-fat, low-fibre diet, which is likely to lead to weight gain.
must know
Weight reduction benefits
Here is an overview of the average benefits of a 10 per cent (10 kg or 22 lb) reduction in weight of a man with a starting weight of 100 kg (220 lb) or just under 16 stone.