Managing weight can be more complicated when you have MS. Fatigue, reduced mobility, changes in activity levels, and some medications can all affect body weight. For some people the main concern is weight gain, while for others, particularly with more advanced MS, maintaining weight and muscle can be the issue.

Weight is one part of overall health, and it is modifiable. This article looks at what the research shows about weight and MS, why it matters, and practical, realistic steps that can help.

Key Takeaways

• Why weight can be harder to manage with MS
• What research shows about weight and MS outcomes
• Practical approaches to diet and physical activity
• How fatigue, sleep, and mood affect weight
• When to seek support from your healthcare team

Why Weight Matters in MS

Being overweight or obese is common in people with MS. An international study of people with MS found that around 1 in 5 were obese and a further 1 in 5 were overweight. The same research found that obesity was associated with other health conditions, including type 2 diabetes, high blood pressure, and depression.

Carrying excess weight may also affect MS itself. Research has found that obesity around the time of diagnosis is associated with higher levels of disability and faster disability accumulation over several years. Excess weight can also place additional strain on mobility and contributes to ongoing low-level inflammation in the body.

Weight can affect fatigue, energy, mobility, sleep, cardiovascular health, bladder health and overall wellbeing.

What the Research Shows

Weight loss does not treat MS, but it can have benefits that improve daily function. Maintaining muscle is important, particularly as MS can reduce activity and lead to muscle loss over time. For this reason, weight management in MS focuses on overall health and body composition, not weight alone.

Practical Approaches

Stay active within your limits. Regular physical activity supports weight management, mobility, and general health. Research shows that exercise and physical activity can improve function and quality of life in people with MS. Activity can be adapted to your ability, including seated exercises if needed. Some physical activity is better than none!

Aim for a balanced diet. A diet with plenty of vegetables, fruit, wholegrains, and fibre, with smaller amounts of processed and high-sugar foods, supports a healthy weight. There is no single MS diet supported by strong evidence, so a balanced, sustainable approach is generally recommended.

Consider portion sizes. Reduced activity can lower the amount of energy your body needs. Adjusting portion sizes can help match intake to activity levels.

Address fatigue and sleep. Fatigue can reduce activity, and poor sleep can affect appetite and weight. Managing these can make other changes easier.

Make changes gradually. Small, sustainable changes tend to work better over time than rapid or restrictive approaches.

When to Seek Support

It is worth speaking with your GP, MS nurse, or a dietitian if weight is affecting your health or mobility, if you are losing weight or muscle without trying, or if you would like help planning changes. A dietitian can provide tailored advice, and an exercise physiologist or physiotherapist can design a safe activity program. Some of these services may be available through a GP Management Plan, or through the NDIS for eligible participants, and many are available by telehealth for people in regional Australia.

Summary

Weight can be harder to manage with MS, and being overweight is common. Research links excess weight with other health conditions and, around the time of diagnosis, with higher disability. A balanced diet, regular activity within your limits, and attention to fatigue and sleep can all help. Maintaining muscle matters as much as managing weight.

Small, sustainable changes, with support from your healthcare team, are generally the most effective approach.

FAQs

Is there a specific diet for MS? No single MS diet is supported by strong evidence. A balanced diet with plenty of vegetables, fruit, wholegrains, and fibre is generally recommended.

Will losing weight improve my MS? Research suggests that a healthy weight may support better outcomes, although more studies are needed. Weight is one part of overall health.

I have trouble exercising. Can I still manage my weight? Yes. Activity can be adapted to your ability, and diet plays a large role. A dietitian or exercise physiologist can help.

Could my medication be affecting my weight? Some medications can affect weight or appetite. It is worth discussing this with your GP or neurologist rather than stopping any medication.

Should I be concerned about losing weight? Unplanned weight or muscle loss is worth raising with your healthcare team, as it can affect strength and overall health.

References

1. Lutfullin, I., Eveslage, M., Bittner, S., et al. (2022). Association of obesity with disease outcome in multiple sclerosis. Journal of Neurology, Neurosurgery & Psychiatry. https://doi.org/10.1136/jnnp-2022-329685
2. Marck, C. H., Neate, S. L., Taylor, K. L., Weiland, T. J., & Jelinek, G. A. (2016). Prevalence of comorbidities, overweight and obesity in an international sample of people with multiple sclerosis and associations with modifiable lifestyle factors. PLoS ONE, 11(2), e0148573. https://doi.org/10.1371/journal.pone.0148573
3. Kidwell-Chandler, A., Jackson, J., Jeng, B., Silveira, S. L., Pilutti, L. A., Hibbing, P. R., & Motl, R. W. (2025). Body composition and its outcomes and management in multiple sclerosis: Narrative review. Nutrients, 17(6), 1021. https://doi.org/10.3390/nu17061021
4. Pilutti, L. A., Silveira, S. L., Herring, M. P., et al. (2025). Multiple sclerosis is associated with worse body composition across compartments: Results from a systematic review and meta-analysis. Multiple Sclerosis and Related Disorders, 101, 106553. https://doi.org/10.1016/j.msard.2025.106553
5. Weld-Blundell, I. V., Grech, L., Learmonth, Y. C., & Marck, C. H. (2022). Lifestyle and complementary therapies in multiple sclerosis guidelines: A systematic review. Acta Neurologica Scandinavica, 145(4), 379–392. https://doi.org/10.1111/ane.13574
6. Amatya, B., Khan, F., & Galea, M. (2019). Rehabilitation for people with multiple sclerosis: An overview of Cochrane reviews. Cochrane Database of Systematic Reviews, 1, CD012732. https://doi.org/10.1002/14651858.CD012732.pub2