Bone loss with Crohn’s disease can be reduced by keeping intestinal inflammation under control, getting enough calcium and vitamin D, eating enough nourishing food, staying active with weight-bearing exercise, and avoiding smoking. Ask your care team whether you need blood tests for vitamin D or a bone-density scan, especially if you have ongoing inflammation, trouble absorbing nutrients, low body weight, or use steroid medicines repeatedly or for a long time.
Why can Crohn's disease weaken bones?
Crohn’s disease affects the digestive tract, but its effects can extend beyond the intestines. Ongoing inflammation, poor nutrient absorption, inadequate nutrition, and certain medicines can interfere with the maintenance of strong bones. Some people develop osteopenia, meaning lower-than-expected bone density, or osteoporosis, a condition in which bones become weaker and are more likely to fracture.
According to the European Crohn’s and Colitis Organisation (ECCO), factors associated with reduced bone density in people with inflammatory bowel disease include active inflammation, frequent corticosteroid use, low body weight, poor nutrition, reduced physical activity, smoking, and problems absorbing calcium or vitamins. These factors can overlap, so prevention usually involves several measures rather than relying on one supplement or lifestyle change.
- Ongoing intestinal inflammation: Poorly controlled Crohn’s disease can contribute to nutritional problems and reduced bone strength.
- Low calcium or vitamin D intake: These nutrients are important for maintaining healthy bones.
- Reduced nutrient absorption: Inflammation affecting the small intestine or previous bowel surgery may make it harder to obtain or absorb certain nutrients.
- Repeated or prolonged corticosteroid treatment: Medicines such as prednisone can increase the risk of bone loss, particularly with longer exposure.
- Low body weight or inadequate food intake: Difficulty eating enough during a flare can make it harder to meet nutritional needs.
- Limited physical activity and smoking: Both can contribute to poorer bone health.
Keep Crohn's disease under control
Controlling intestinal inflammation is an important part of protecting bone health. Effective treatment can help reduce ongoing inflammation, improve the ability to maintain adequate nutrition, and limit the need for repeated courses of corticosteroids. Continue taking prescribed Crohn’s medicines as directed, even when symptoms improve, unless your healthcare professional advises a change.
The UK charity Crohn’s & Colitis UK explains that maintaining control of Crohn’s disease and reducing exposure to steroids when clinically appropriate can help protect bone health. If you need repeated steroid courses or treatment over a longer period, discuss your bone-health risk with your gastroenterologist. Your clinician may consider other ways to control inflammation while limiting steroid exposure, depending on your condition and treatment history.
Do not reduce or stop corticosteroids on your own. These medicines may be necessary to control a flare, and stopping them abruptly can be unsafe. Instead, ask your healthcare team how your treatment plan balances control of intestinal inflammation with the prevention of long-term side effects.
Get enough calcium and vitamin D
Calcium helps build and maintain bones, while vitamin D helps your body absorb calcium. Getting adequate amounts of both nutrients is an important part of preventing bone loss in Crohn’s disease. Food is a useful starting point, but some people need supplements because of restricted diets, poor absorption, deficiencies, or treatment with corticosteroids.
The Crohn’s & Colitis Foundation identifies calcium and vitamin D as important nutrients for people with inflammatory bowel disease, particularly those using corticosteroids or who have low bone density. Helpful food choices may include:
- Calcium-rich foods: Milk, yogurt, cheese, calcium-fortified plant drinks, tofu prepared with calcium, and fish such as sardines with edible bones.
- Vitamin D sources: Fatty fish, egg yolks, and foods fortified with vitamin D, such as some dairy products, plant drinks, and breakfast cereals.
- Other nutritious foods: Eggs, fish, poultry, beans, tofu, and other tolerated sources of protein can help support overall nutritional needs.
If lactose causes symptoms, lactose-free dairy products or suitable calcium-fortified alternatives may help you maintain calcium intake. Choose foods that fit your digestive symptoms and any restrictions recommended for your Crohn’s disease. A diet that is too restrictive can make it harder to obtain enough nutrients.
Should you take calcium or vitamin D supplements?
Supplements may be appropriate when food alone does not meet your needs, when tests show a deficiency, or when your treatment and medical history increase your risk of bone loss. Your healthcare professional can review your diet, symptoms, bowel surgery history, medications, and relevant test results to determine whether supplementation is needed and what dose is suitable.
Do not assume that taking larger amounts will provide extra protection. The right approach depends on your current intake, absorption, and medical circumstances. Tell your clinician about all vitamins and supplements you use, including products purchased without a prescription. They may recommend checking vitamin D levels and adjusting the plan according to the results.
Maintain good nutrition during flares
During a Crohn’s flare, abdominal pain, diarrhea, nausea, reduced appetite, or food intolerance can make it difficult to eat enough. Some people also absorb nutrients less effectively because of intestinal inflammation or previous surgery. These problems can affect bone health when they persist or lead to deficiencies.
The Crohn’s & Colitis Foundation’s guidance on malnutrition in inflammatory bowel disease highlights poor nutrient absorption, vitamin deficiencies, reduced activity, inflammation, and corticosteroid use among factors associated with decreased bone strength. Regular nutritional review can help identify gaps before they become more difficult to correct.
Helpful steps include eating regular meals or smaller, more frequent meals when tolerated, choosing nutrient-rich foods that do not worsen your symptoms, and asking whether a registered dietitian with experience in inflammatory bowel disease could help. If you have persistent diarrhea, unintentional weight loss, difficulty eating enough, or concerns about food restrictions, tell your care team. They may recommend nutritional tests, changes to your eating plan, or targeted supplements.
Choose regular exercise that supports bone strength
Physical activity helps maintain bone strength, muscle strength, balance, and mobility. Weight-bearing activities make your body work against gravity, while resistance exercises challenge your muscles. Suitable options may include walking, climbing stairs, dancing, and strength training adapted to your abilities and current health.
Start at a manageable level and increase activity gradually as your fitness and symptoms allow. During a flare, fatigue, abdominal discomfort, or joint symptoms may make your usual routine harder to maintain. Adjusting the duration or intensity can help you remain active without pushing beyond what feels manageable.
The ECCO guidelines on inflammatory bowel disease recommend promoting physical activity and smoking cessation as part of preventing low bone density. If you have osteoporosis, a previous fracture, significant joint problems, or difficulty with balance, ask a healthcare professional which exercises are appropriate before starting a new program.
Avoid smoking and discuss alcohol use
Smoking is a modifiable risk factor for poor bone health. Stopping smoking is a practical step that supports overall health and may help reduce factors associated with bone loss. Ask your healthcare professional about smoking-cessation support if you need help quitting.
Alcohol can also be relevant to bone health, particularly when intake is high. Discuss your drinking habits with your clinician if you are concerned about osteoporosis or have other fracture risks. Avoid relying on lifestyle changes alone when Crohn’s disease, nutritional deficiencies, or medication exposure may also be contributing to the problem.
Ask whether you need a bone-density scan
Bone loss may develop without obvious symptoms, so symptoms alone cannot reliably establish whether your bones have weakened. A bone-density scan, usually called a dual-energy X-ray absorptiometry (DXA or DEXA) scan, measures bone mineral density and can help identify low bone density and assess fracture risk in the appropriate clinical context.
According to the ECCO guidelines, bone-density measurement is recommended for people with inflammatory bowel disease who are at high risk of osteoporosis. Your healthcare professional may consider factors such as previous fractures after minor injuries, prolonged or repeated corticosteroid use, low body weight, nutritional deficiencies, ongoing inflammation, age, and menopausal status when deciding whether testing is appropriate.
There is no need to assume that every person with Crohn’s disease requires the same screening schedule. Ask whether you need a baseline scan, when it should be repeated, and how its findings would affect your care. Depending on your situation, your clinician may also review vitamin D levels, calcium intake, medication history, and other factors that influence bone health.
How does bone-loss prevention differ for children and adults?
Bone health deserves particular attention in children and teenagers because their bones are still growing and building strength. Active Crohn’s disease, inadequate nutrition, delayed growth, and corticosteroid exposure may interfere with healthy development. Parents or caregivers should discuss growth, nutrition, and bone health with the child’s gastroenterology team, especially when weight gain or growth has become a concern.
In adults, the prevention plan depends on factors such as disease activity, nutritional status, medication exposure, age, and fracture history. People who are postmenopausal or older may have additional reasons to discuss osteoporosis assessment. Pregnancy planning, previous fractures, and other conditions or medicines that affect bone health may also influence individual recommendations.
When might treatment for bone loss be needed?
Lifestyle changes and appropriate nutrition are important, but they may not be enough for everyone. If a bone-density scan or review of your medical history indicates a high risk of fractures, your healthcare professional may recommend medication specifically intended to treat osteoporosis or reduce further bone loss. The choice depends on the underlying causes, scan findings, other health conditions, and individual risks.
Early discussion is particularly useful if you have used corticosteroids for a prolonged period, have had a fracture after a minor injury, or have ongoing problems maintaining adequate nutrition. A coordinated plan involving your gastroenterologist, primary care clinician, and dietitian when needed can help address Crohn’s disease and bone health together.
Preventing bone loss with Crohn’s disease involves controlling inflammation, meeting calcium and vitamin D needs, maintaining adequate nutrition, staying physically active, avoiding smoking, and assessing bone density when indicated. Regularly reviewing these areas with your healthcare team helps identify problems that may need attention and allows prevention measures to be tailored to your needs.