If you are underweight, your body has less energy and nutrient stores to help it do its work.
Being underweight can cause your muscles to become weak which may limit your ability to complete the activities you enjoy and can increase your risk of falls. The respiratory muscles that help you to breathe can also be affected and they may fatigue more quickly.
Being underweight can have a negative impact on your lung function, make it more difficult to exercise and possibly increase your risk of infection.
Issues with swallowing and breathlessness can contribute to being underweight and are both addressed in detail in this education program.