Nutritional therapy for weight gain can support your healthy weight gain journey and ensure it is sustainable and realistic for a healthful future.

If you are underweight, you may find you come up against health challenges such as fatigue and a weakened immune system. Sometimes illness itself leads to unintentional weight loss; if you are losing weight suddenly without trying, it’s worth visiting your doctor to check there are no medical causes.

If you have the all-clear from your doctor and want to gain weight to support your health and wellness, seeking support from a nutrition professional may help.

Causes of low weight

There are several factors that may lead to someone being underweight. For some, it’s down to family genetics and a naturally slight figure, for others an illness may be the cause. Below are a few examples of what could cause a low weight:

a high metabolism (those with high metabolisms may struggle to gain weight even when eating high-energy foods)
genetic disposition (for some, low weight runs in the family)
frequent exercise (those who are very physically active may find they have a low body weight)
physical illness (illnesses like diarrhoea may cause you to lose weight temporarily while long-term conditions like diabetes, cancer and digestive issues can lead to ongoing weight management struggles)
mental illness (some mental health conditions can affect weight, including depression, anxiety and eating disorders
Risks of being very underweight

In a society that often praises bodies at a low weight, you may think there isn’t a problem with being underweight. The truth, however, is that being very underweight can lead to health problems. Below are a few to be aware of.

Nutritional deficiencies

If you’re underweight, you may not be taking in key nutrients your body needs. If you don’t consume enough iron, for example, you could develop anaemia which makes you feel very low in energy.

Fertility problems

If you menstruate and become very underweight, you could find your period stops. This can lead to difficulties for those trying to conceive.

Weakened immune system

Being underweight can affect the immune system, meaning it won’t work properly. When this happens, the body is less able to fight infections and you may find you pick up viruses and infections more easily.

Skin, hair or teeth problems

If you are deficient in certain nutrients, you may notice your skin, hair and teeth are affected. You may notice dry skin, thinning hair or problems with your dental health.

Fatigue

The food we consume gives us energy. If you’re not eating enough energy-giving foods, you may feel more tired than normal. This can make day-to-day tasks more difficult.

Osteoporosis

Bone health can be affected if you’re underweight, especially if you aren’t getting enough calcium in your diet. Osteoporosis is a condition that causes bones to be more brittle and prone to breaking.