Higher Intake of Ultraprocessed Foods Weakens Bones

A large study in the British Journal of Nutrition using over 160,000 adults from the UK Biobank followed participants for about 12 years and found that people who ate more ultra-processed foods had lower bone mineral density in the upper femur and lumbar spine and a higher risk of hip fractures.

On average, participants consumed about 8 servings of ultra-processed foods per day, and every additional 3.7 servings per day (roughly a frozen dinner entrée, a soda, and a cookie) was associated with a 10.5% increase in hip fracture risk.
Who is most affected

The association between ultra-processed food intake and lower bone density was strongest in adults younger than 65 and in people who were underweight, with a body mass index below 18.5.

Researchers suggest younger adults may absorb harmful components of these foods more efficiently, while underweight individuals already face higher baseline risk for poor bone health, so ultra-processed diets may worsen their bone loss.
Possible mechanisms

Ultra-processed foods tend to be low in calcium, vitamin D, protein, and other bone-supporting nutrients and high in ingredients that promote inflammation, which can weaken bones over time.

Low physical activity, along with inadequate intakes of magnesium, potassium, vitamin K, and overall calories, may compound the negative impact of ultra-processed eating patterns on bone density.

Other analyses estimate that roughly 70–73% of the U.S. food supply consists of ultra-processed products, underscoring how pervasive these items are in the modern diet.

Ultra-processed foods include many frozen meals, sweetened breakfast cereals, sugary drinks, instant noodles, and packaged snacks, which are typically low in fiber and high in salt, added sugars, and unhealthy fats.

Dietitians such as Theresa Gentile recommend first “adding” nutrition to existing ultra-processed meals (for example, adding eggs, vegetables, and lean protein to instant ramen or frozen pizza) as a realistic way to start reducing reliance on these foods.

Experts agree that diets rich in whole foods—fruits, vegetables, whole grains, nuts, seeds, and lean proteins—support better bone outcomes by providing calcium, vitamin D, protein, magnesium, potassium, antioxidants, and adequate calories.

Combining this kind of eating pattern with regular resistance or weight-bearing exercise is emphasized as a practical way to maintain bone mass and lower fracture risk over time