A new long-term analysis found that higher intake of ultra-processed foods (UPFs) is linked with poorer bone health, including lower bone mineral density (BMD) and a higher risk of hip fracture. The association was noticeable even in adults under 65 and in those who are underweight.
Study and key findings
– Researchers analyzed data from more than 160,000 people in the UK Biobank, followed for over 12 years.
– On average participants consumed about eight servings of UPFs per day.
– For every 3.7 additional daily servings of UPFs, hip fracture risk rose by 10.5%; those 3.7 servings are roughly equivalent to a frozen dinner, a soda, and a cookie.
– Higher UPF intake was associated with reduced BMD at several sites, including parts of the upper femur and lumbar spine.
– Associations were strongest in people under age 65 and in those with BMI under 18.5.
Why this may happen
– Nutrient gaps: UPFs are often low in nutrients important for bone health (calcium, vitamin D, protein, phosphorus, magnesium, potassium, vitamin K). Lower intake of these can weaken bone over time.
– Inflammation: Diets high in UPFs may increase systemic inflammation, which can negatively affect bone remodeling.
– Lifestyle clustering: Higher UPF consumption may accompany lower physical activity; less weight-bearing or resistance exercise reduces the mechanical stimulus needed to maintain bone density.
– Absorption/age effects: Authors suggest stronger digestive function in younger people might increase absorption of harmful components in UPFs, possibly amplifying effects there. Underweight individuals are already at higher bone risk, so UPFs may further worsen outcomes.
What are ultra-processed foods?
UPFs are industrially manufactured products that tend to be highly palatable and convenient but are typically low in fiber and micronutrients and high in added sugars, salt, and unhealthy fats. Common examples include frozen meals, many breakfast cereals, sweetened beverages, convenience snacks, instant noodles, and many packaged baked goods.
Prevalence and broader health context
– CDC data indicate UPFs make up roughly 55% of calories consumed by US children and adults.
– The FDA notes that a large portion of the U.S. food supply consists of ultra-processed products.
– Beyond bone health, high UPF intake has been linked with a range of poorer health outcomes in other studies.
Expert perspective and practical advice
– The study is observational, so it shows associations rather than direct causation, but it aligns with growing evidence that diet quality affects bone outcomes.
– Nutrition experts emphasize ensuring adequate intake of calcium, vitamin D, protein, and other bone-related nutrients, and pairing diet with resistance or weight-bearing exercise to help maintain bone mass.
– Practical steps to reduce the impact of UPFs include shifting toward whole foods (fruits, vegetables, whole grains, nuts, seeds, lean proteins) and making small, sustainable swaps or add-ons to boost nutrition (e.g., adding eggs or shredded chicken and vegetables to instant noodles; adding salad to frozen pizza; topping instant oatmeal with fruit, nuts, or seeds; adding veggies and lean protein to jarred pasta sauce).
– Ensuring sufficient overall calories and protein helps preserve muscle and bone and reduces fracture risk.
Takeaway
This large, long-term study links higher consumption of ultra-processed foods with lower bone density and a higher risk of hip fracture, even among younger adults and those who are underweight. While observational, the findings reinforce guidance to prioritize nutrient-rich, whole foods and regular resistance exercise to support bone health.
