We talk a lot about being overweight, more rarely about being thin. However, a BMI that is too low can also have health consequences and signal an underlying problem. Recognizing thinness, understanding the possible causes and knowing when to consult is part of a comprehensive approach to health.
1. What do we call thinness?
In adults, a BMI below 18.5 is considered a sign of thinness, to be interpreted depending on the context. Some people are naturally thin and healthy; others are underweight and deserve attention, especially in cases of recent, unintentional weight loss.
2. Possible consequences
Too low weight can be accompanied by deficiencies, fatigue, reduced immunity, hormonal disorders or bone fragility. In the elderly, malnutrition increases the risk of complications and loss of autonomy.
| Domain | Possible risk |
|---|---|
| Immunity | Lower defenses |
| Os | Frailty, osteoporosis |
| Hormones | Cycle Disorders |
| Energy | Fatigue, weakness |
3. Various causes
Thinness can be constitutional, but also linked to insufficient nutrition, an illness, an eating disorder, significant stress or certain treatments. Unexplained weight loss should always lead to consultation.
4. When and how to act
If the weight is stable, low but without other signs, there is no necessarily cause for concern. On the other hand, unintentional weight loss, marked fatigue or other symptoms warrant medical advice to find the cause and offer appropriate support.
The care, often multidisciplinary, aims to regain a satisfactory nutritional state, with kindness and without judgment.
If you are concerned about your weight or your diet, a healthcare professional can help you. In case of difficulties related to eating behavior, specialized support is available.
💡 tips to remember
- In adults, a BMI below 18.5 indicates thinness, to be interpreted according to the context: some people are naturally thin and healthy.
- A weight that is too low can lead to deficiencies, fatigue, reduced immunity and bone fragility.
- In the elderly, undernutrition increases the risk of complications and loss of autonomy.
- Involuntary and unexplained weight loss should always lead to consultation to find the cause.
- In case of concern around weight or eating behavior, caring professional support exists.
