What is the metabolic syndrome?
The term metabolic syndrome does not describe a single disease but the simultaneous occurrence of several metabolic risk factors. This combination can significantly increase the risk of cardiovascular disease, type 2 diabetes and vascular changes. In Austria, it can be assumed that a considerable proportion of the adult population is affected – often without being aware of it.
Four areas in particular tend to fall out of balance:
- increased abdominal fat
- elevated blood pressure
- disturbed glucose and insulin metabolism
- altered blood lipid levels
In specialist circles, this combination is sometimes referred to as the "deadly quartet", because the individual factors can reinforce one another.
The criteria at a glance
Several internationally recognised definitions are used to diagnose the metabolic syndrome. The criteria of the International Diabetes Federation (IDF) are often applied. According to these, a metabolic syndrome is present when an increased waist circumference is accompanied by at least two further factors.
Waist circumference as the central criterion
Visceral fat – the fatty tissue inside the abdomen – is considered particularly metabolically active. In Europe, the following thresholds are commonly cited as indicating increased risk:
- women: waist circumference of 80 cm or more
- men: waist circumference of 94 cm or more
Other typical findings
In addition to waist circumference, the following values play a role:
- elevated blood pressure (from 130/85 mmHg, or already treated hypertension)
- elevated fasting blood glucose (from 100 mg/dl), or known type 2 diabetes
- elevated triglycerides (from 150 mg/dl)
- low HDL cholesterol ("good" cholesterol): below 50 mg/dl in women, below 40 mg/dl in men
If several of these points apply, medical assessment is advisable.
Metabolic risk factors
The syndrome has multiple causes. Lifestyle, genetic predisposition and environmental conditions interact. The most important metabolic risk factors include:
- Lack of exercise: A predominantly sedentary lifestyle means lower energy expenditure and encourages the accumulation of abdominal fat.
- Energy-dense diet: A diet with plenty of simple carbohydrates, sweetened drinks and highly processed foods can adversely affect blood sugar and lipid levels.
- Overweight, especially around the abdomen: The link between high blood pressure and body weight is well established.
- Chronic stress and lack of sleep: Both factors can disrupt hormonal regulation.
- Smoking and increased alcohol consumption: These place strain on blood vessels and the liver.
- Genetic predisposition: A family history of diabetes or cardiovascular disease can influence individual risk.
- Age and hormonal changes: Fat distribution may change, particularly after the menopause.
Possible consequences if the syndrome is ignored
In its early stages, the metabolic syndrome often causes no symptoms, which is precisely what makes it insidious. In the long term, however, it can contribute to serious health consequences:
- type 2 diabetes
- atherosclerosis (hardening of the arteries)
- coronary heart disease, heart attack, stroke
- non-alcoholic fatty liver disease
- impaired kidney function
- sleep apnoea
- certain types of cancer, the risk of which may be increased with obesity
Early recognition and consistent follow-up can help slow progression and reduce the individual risk.
How is the diagnosis made?
Medical assessment takes place in several steps and is usually straightforward:
History-taking and physical examination
The consultation covers lifestyle habits, family history and previous findings. Waist circumference, body weight, blood pressure and cardiovascular status are examined.
Laboratory tests
A blood sample – ideally taken fasting – provides the key values:
- fasting blood glucose, if necessary HbA1c
- triglycerides
- HDL and LDL cholesterol
- liver and kidney values
- if required, further parameters such as uric acid or inflammatory markers
Additional investigations
Depending on the individual situation, an ECG, an ultrasound examination of the abdominal organs or 24-hour blood pressure monitoring may be useful to better assess the overall picture.
Holistic medical support
The metabolic syndrome rarely calls for a single measure, but rather a coordinated overall approach. The aim is to improve the risk factors together, step by step.
Nutrition
A balanced, plant-based diet with sufficient fibre, high-quality fats and a moderate calorie intake can have a favourable effect on many of the values involved. Individual dietary counselling is often helpful, as generic diets rarely work in the long term.
Exercise
Regular physical activity – ideally a combination of endurance and strength training – can improve insulin sensitivity, lower blood pressure and support weight management. Even moderate increases in everyday activity, such as daily brisk walking, can make a contribution.
Sleep, stress and lifestyle
Restful sleep, strategies for managing stress and giving up smoking are key building blocks. They often have a positive effect on blood pressure, blood sugar and general well-being.
Medication-based support
Depending on the findings, the treating doctor may recommend medication, for example to lower blood pressure, improve lipid levels or treat early-stage diabetes. Such decisions are always made on an individual basis and in line with current guidelines.
Regular follow-up checks
Because the metabolic syndrome often develops gradually, regular check-ups are advisable. They make it possible to respond early to changes and to adapt care to the respective life situation.
When should you seek medical advice?
A consultation for assessment may be useful if:
- waist circumference has increased noticeably
- diabetes or cardiovascular disease occur frequently in the family
- blood pressure is repeatedly elevated
- previous laboratory findings showed borderline values
- there are general complaints such as fatigue, reduced performance or sleep problems
The earlier a metabolic syndrome is identified, the better strategies can be developed together to contribute to a higher quality of life and a lower risk of secondary diseases.
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This article does not replace medical advice.