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Weight and muscle changes

Weight and muscle changes are a side effect of low sex hormone levels. Find out more about why and what can help.

Some cancer treatments can lower the levels of sex hormones in the body. The sex hormones are oestrogen and progesterone in women, and testosterone in men. The cancer treatments include hormone treatments for prostate cancer.

Prostate cancer needs testosterone to grow. Hormonal treatments aim to:

  • stop the testicles from making testosterone
  • stop testosterone reaching cancer cells

How sex hormones affect weight and muscle

As we get older we lose muscle strength. Hormone treatment which lowers testosterone levels also causes loss of muscle bulk in men. It can lead to:

  • loss of muscle mass (sarcopenia)
  • loss of muscle strength (dynapenia)

An increase in your weight is common with hormone treatment. This is usually around your waist. Hormone treatment can also make you feel tired and this can make you less active. In turn this can then make the weight gain worse.

Exercise, muscle mass and weight gain

Changing your diet and being more physically active may help you to maintain your normal weight.

Physical activity can help to maintain muscle strength, but it needs to be a combination of aerobic and resistance exercise.

Aerobic exercise is any exercise that makes your heart and lungs work faster to provide more oxygen to the muscles for example walking or gardening.

Resistance training includes weight training and swimming. You have to use your muscles to push against the weights or water, which helps to strengthen them.

Talk to your doctor or specialist nurse before you start if you aren’t normally very physically active. They can help you work out what is best for you.

Physical activity also helps to control your weight. You don’t have to go to the gym, you can build it into your life. For example you could get off the bus the stop before you need to, do some gardening or join a walking group.

You should aim to be physically active for 30 minutes 5 days a week. Your doctor may check your cholesterol and heart health before you start an exercise plan. This is important if you have conditions such as diabetes or you are overweight.

Hormone treatment may lower your bone density, increasing the risk of fractures. Talk to your doctor if this could be a problem for you.

Eating a balanced healthy diet can help you to maintain a healthy weight. It can also help you lose or put it on if you need to.

Last reviewed: 
26 Sep 2016
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    D Galvao and others
    Journal of Clinical Oncology, 2010. Vol 28, No 2, 340-347

  • Effect of androgen deprivation therapy on muscle attenuation in men with prostate cancer
    D Chang and others
    Journal of Medical Imaging and Radiation Oncology, 2014. Vol 58, 223-228

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    C Champ and others
    Prostate Cancer, 2016. Vol 2016, Article ID 9462975

  • Physical activity guidelines for older adults
    NHS Choices (Accessed June 2016)

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