A large, long-term analysis found that eating more ultra-processed foods (UPFs) is associated with weaker bones and a higher risk of hip fracture. The study followed more than 160,000 people in the UK Biobank for over 12 years and tracked both bone mineral density (BMD) and fracture outcomes.
Key findings
– Participants consumed about eight servings of UPFs per day on average. For every 3.7 extra daily servings of UPFs—roughly the equivalent of a frozen dinner, a soda and a cookie—hip fracture risk increased by about 10.5%.
– Higher UPF intake was also linked with lower BMD at multiple sites, including areas of the upper femur and the lumbar spine.
– Associations were strongest in adults younger than 65 and in people with a BMI under 18.5, groups that showed greater relative vulnerability in this analysis.
Why this could be happening
– Nutrient shortfalls: UPFs tend to be low in nutrients that support bone health—calcium, vitamin D, protein, phosphorus, magnesium, potassium and vitamin K. Chronic insufficiency of these nutrients can weaken bone over time.
– Inflammation: Diets high in ultra-processed products may increase systemic inflammation, which can interfere with normal bone remodeling.
– Lifestyle clustering: High UPF consumption often occurs alongside less physical activity. Reduced weight-bearing and resistance exercise means less mechanical stimulus to maintain bone mass.
– Age and absorption: The authors suggest younger adults’ more efficient digestive function may increase absorption of harmful components in UPFs, potentially amplifying negative effects. Underweight people are already at higher fracture risk, so a poor-quality diet may add further harm.
What counts as ultra-processed food?
UPFs are industrially formulated products that prioritize convenience and palatability. They tend to be low in fiber and micronutrients and high in added sugars, salt and unhealthy fats. Common examples include frozen meals, many packaged breakfast cereals, sweetened drinks, instant noodles, convenience snacks and many baked or packaged sweets.
Prevalence and broader context
– Public health data show UPFs make up a large share of calories in many diets—CDC estimates put UPFs at roughly 55% of calories for U.S. children and adults.
– Other research has also linked high UPF intake with a range of adverse outcomes beyond bone health, reinforcing concerns about diet quality.
Expert perspective and practical steps
– This study is observational, so it shows associations rather than proving causation, but it adds to mounting evidence that overall diet quality matters for bone outcomes.
– Prioritize nutrients that support bone: ensure adequate calcium, vitamin D, protein and other minerals and vitamins important to bone health.
– Pair nutrition with exercise: regular resistance training and weight-bearing activities help maintain bone density and reduce fracture risk.
– Practical swaps and small changes: replace or complement UPFs with whole foods—fruits, vegetables, whole grains, nuts, seeds and lean proteins. Simple tweaks include adding eggs or shredded chicken and vegetables to instant noodles, putting a salad next to a frozen pizza, topping instant oatmeal with fruit, nuts or seeds, or boosting jarred pasta sauce with vegetables and lean protein.
– For people who are underweight, ensuring adequate total calories and protein is especially important to preserve muscle and bone.
Bottom line
This large, long-term study links higher consumption of ultra-processed foods with lower bone density and a higher risk of hip fracture, including in younger adults and those who are underweight. While it cannot prove cause, the findings support existing guidance to favor nutrient-rich whole foods and regular resistance or weight-bearing exercise to help protect bone health.
