- Skipping breakfast raised fracture risk by 18% in nearly one million adults.
- Eating dinner within two hours of bed was tied to an 8% higher fracture risk.
- Simple habits—like a morning meal and earlier dinners—may help protect bones.
Your breakfast routine—or lack of one—may have lasting consequences for your bones.
A massive new Japanese study found that skipping breakfast and eating late dinners were each linked to a higher risk of osteoporotic fractures. The findings add to growing evidence from the field of chrononutrition—which explores how the timing of meals interacts with the body’s internal clock—suggesting that when you eat may matter for long-term health, not just what you eat. For example, researchers have linked eating earlier in the day to better cholesterol levels, lower insulin resistance and less body fat, all of which support the idea of eating in line with your natural circadian rhythm.
That potential connection matters because fragile bones are already a widespread problem. Roughly 13% of U.S. adults age 50 and older have osteoporosis, a disease that weakens bones and makes them more likely to break. Another 43% in the same age group have low bone mass, often called osteopenia. Taken together, more than half of older Americans are living with reduced bone strength and a higher risk of fractures.
Lifestyle habits like exercise, alcohol use and smoking are well known to influence fracture risk. What hasn’t been studied much is whether the timing of meals makes a difference. This study is one of the first to look at how skipping breakfast or eating late dinners might influence fracture risk. The results were published in the Journal of the Endocrine Society.
How Was the Study Conducted?
Researchers analyzed health records from nearly 1 million Japanese adults who took part in routine checkups. The study followed people age 20 and older, linking their lifestyle questionnaires with medical records from a large national claims database. On average, participants were tracked for about 2.6 years.
They focused on two self-reported eating habits: skipping breakfast and having a late dinner. The team tracked 4 types of osteoporotic fractures—hip, forearm, spine and upper arm—and compared people who reported these behaviors and who did not.
What Did the Study Find?
During the study, researchers logged just over 28,000 major fractures. People who skipped breakfast more than three times a week were about 18% more likely to break a bone than those who ate it regularly. Eating dinner within two hours of bedtime more than three times a week was linked to an 8% higher fracture risk.
The study also reinforced what health professionals already know—women, people with lower body weight and older adults are more prone to fractures. It also showed that meal timing habits often traveled with other choices like smoking, drinking, getting less exercise and sleeping less. Put together, the results suggest that lifestyle plays a big role in bone health—and that something as simple as when you eat may add to the risk.
How Does This Apply to Real Life?
Meal timing alone won’t make or break your bones, but it may be worth paying attention to. Starting the day with breakfast gives you a steady supply of nutrients your bones can use. Even simple options like yogurt with fruit, eggs on whole-grain toast or a smoothie made with milk and leafy greens provide protein and calcium without much effort.
Dinner habits matter too. Leaving two to three hours between your last meal and bedtime gives your body time to digest and aligns eating with your natural rhythms. Pairing that with regular weight-bearing exercise—like light strength training—and getting enough sleep helps reinforce bone strength over time.
And if you’re concerned about protecting your bone health, try to incorporate nutrients like calcium, vitamin D, protein and healthy fats into your diet. (Canned salmon can be a great source of all four.)
Our Expert Take
This recent study in the Journal of the Endocrine Society doesn’t prove that skipping breakfast or eating late dinners directly cause fractures, but it highlights how everyday routines may add up in ways we’re only starting to understand. The foundation for bone health is still the same—nutrient-rich foods, physical activity, quality sleep and limited smoking and alcohol—but meal timing may be another piece of the prevention puzzle.
