Does too little protein increase your risk of bone fractures as you age?
Yes, too little protein increases your risk of bone fractures in older age. This works through weaker bones as well as through poorer muscle condition. Aim for at least 1.0 to 1.2 grams of protein per kilogram of body weight per day, preferably together with adequate calcium and vitamin D.
Too little protein harms your bones in two ways at once: it affects bone mass itself and it weakens your muscles. Weaker muscles mean more falls, and with fragile bones a fall is more likely to result in a fracture. In addition, adequate protein stimulates the production of a growth factor needed for bone formation. A low level of that growth factor is an independent risk factor for hip fracture1.
The strongest evidence comes from a randomised trial involving 7,195 nursing home residents with an average age of 86 in Australia. Residents who received extra dairy every day increased their protein intake from 0.9 to 1.1 grams per kilogram of body weight. The result: 46% fewer hip fractures, 33% fewer fractures overall and 11% fewer falls. Mortality remained unchanged2. Those are large reductions in a vulnerable group.
Protein does not work on your bones alone. Protein, calcium and vitamin D complement one another. Older adults who received extra protein after a hip fracture maintained their hip bone density better and had shorter hospital stays. That effect only occurred when calcium and vitamin D intake were also adequate. If one of the three was missing, the benefit was smaller1. Sufficient protein also improves the absorption of calcium in your intestines3.
People who follow a vegan diet have an elevated risk of bone fractures based on several large prospective studies. Vegetarians fall somewhere in between. Lower protein intake is one of the suspected causes, alongside lower calcium, lower vitamin D and a lower body weight. This is observational research, so direct causality has not been established. Deliberately choosing protein-rich plant foods such as legumes, nuts and soy products, supplemented with vitamin D and calcium, appears to partially offset the risk4.
Adequate protein now features explicitly in guidelines. The North American Menopause Society recommends that all postmenopausal women consume sufficient protein, calcium and vitamin D before medication is even considered5. European guidelines go further: anyone using prednisone for three months or longer must maintain adequate protein intake as a mandatory part of treatment6. For older adults the general recommendation is 1.0 to 1.2 grams of protein per kilogram of body weight per day, and more after a fracture or during rehabilitation.
Seven claims are based on seven sources: one large randomised trial (n=7,195), several prospective cohort studies, two guideline publications (NAMS 2021, ECTS 2024), one narrative review and one smaller intervention study. The randomised trial provides the strongest direct evidence. The data on vegans are associative.
Does diabetes increase the risk of bone fractures?
Both type 1 and type 2 diabetes clearly and demonstrably increase the risk of bone fractures. If you have diabetes, discuss with your doctor whether your bone health is being properly monitored, as the standard risk score underestimates this risk.
Does drinking a lot of coffee increase the risk of bone fractures?
For most people, coffee does not appear to be a proven cause of bone fractures, but for women who drink a lot of coffee some caution is reasonable; in that case, make sure to get enough calcium and vitamin D in your diet.
Are there dietary patterns that have been proven to reduce bone fractures?
Fermented dairy, sufficient vegetables and fruit, and a varied diet with protein and calcium are best supported for bone protection, while soft drinks, alcohol and an overly narrow (vegan) diet without supplementation increase your fracture risk.
Why do bones break more easily as you get older?
With age, bones become both thinner and more fragile through a combination of hormonal changes, deteriorating bone structure and reduced physical activity. Understanding which factors are involved helps you take targeted action: sufficient exercise and a calcium-rich diet are the most concrete levers you have within your own control.
Does being overweight affect your bone density?
Being overweight does not straightforwardly increase bone density, and the location and amount of fat strongly determine whether the skeleton benefits or is harmed. If you are considering losing weight, do so gradually and combine it with strength training to limit bone loss.
How do you prevent bone loss when losing weight at an older age?
Strength training while losing weight is the best protection against bone loss, but cannot prevent it entirely. Combine it with adequate protein intake and discuss it with your doctor if you are losing weight quickly or in large amounts.