Calcium and vitamin D dominate the conversation about bone health nutrition. Protein is underemphasized — yet inadequate protein is one of the primary reasons older Canadians lose bone density and muscle mass simultaneously. The two are connected, and the connection has practical implications.
Bone is not just mineral. Approximately 22% of bone tissue by weight is protein — primarily type I collagen, which forms the structural scaffold onto which calcium and phosphate minerals crystallize. Without an adequate protein supply, the collagen matrix cannot be properly maintained or built upon. The mineral has nowhere to attach.
This matters particularly when bone remodeling is active — during fracture healing, after starting anabolic therapy, or when trying to build bone in response to exercise. The bone-building machinery requires protein as raw material.
A 2017 meta-analysis in the Journal of Bone and Mineral Research (Shams-White MM et al., JBMR 2017) pooled data from studies including over 12,000 participants and found that higher protein intake was significantly associated with higher BMD at both the spine and hip. The association held across both animal and plant protein sources, though the effect size varied.
For decades, dietary advice warned that high protein intake causes urinary calcium loss — the idea being that protein increases acid load and the body neutralizes this by leaching calcium from bone. This concern was based on studies measuring urinary calcium excretion, which does increase with protein intake.
What those older studies missed: urinary calcium excretion is not the same as net calcium loss. More recent metabolic studies and meta-analyses show that higher protein intake simultaneously increases intestinal calcium absorption. The net effect on calcium balance is neutral or slightly positive when calcium intake is adequate. The "protein leaches calcium" concern reflects outdated science and has been revised in current Osteoporosis Canada dietary guidance.
The practical implication: there is no reason to limit protein intake for bone health. If anything, inadequate protein is the more common problem in older Canadian adults.
Health Canada's Dietary Reference Intake sets the Recommended Dietary Allowance for protein at 0.8g per kilogram of body weight per day for adults. This is a minimum to prevent deficiency, not an optimal target for aging bone and muscle.
| Population | Target (g/kg body weight/day) | Example for 70kg person |
|---|---|---|
| General adult (Health Canada RDA) | 0.8 g/kg | 56 g/day |
| Older adults (50+) for bone and muscle health | 1.0–1.2 g/kg | 70–84 g/day |
| Recovering from fracture (with physiotherapy) | 1.2–1.5 g/kg | 84–105 g/day |
The 1.0–1.2 g/kg target for older adults is supported by the 2013 PROT-AGE Study Group consensus and is consistent with International Osteoporosis Foundation guidance. This level supports both muscle preservation (preventing sarcopenia) and bone collagen matrix maintenance.
Higher targets during fracture recovery reflect the increased demands of bone healing and rehabilitation. Adequate protein during this period, combined with physiotherapy, is associated with better recovery outcomes and shorter hospital stays in published trials.
Statistics Canada's Canadian Community Health Survey (CCHS) data on dietary intake shows that Canadians aged 71 and older consume, on average, approximately 1.0 g/kg/day — right at the lower end of the evidence-based range for older adults. Due to decreased appetite, illness, dental problems, and reduced food variety, many fall below even the 0.8 g/kg minimum.
Sarcopenia (the age-related loss of muscle mass and strength) and osteoporosis frequently co-occur. This is not coincidental — both require adequate protein, and both worsen when protein intake is chronically low. A person losing muscle and bone simultaneously is at substantially higher fracture risk, because muscle loss means reduced strength to catch a fall and reduced mechanical stimulation of bone.
If you're over 60, tracking your protein intake for even a few days using a free app (Cronometer works well with Canadian food items) will often reveal you're getting less than you think.
The following sources are particularly valuable for bone health — either because they provide protein alongside meaningful calcium, or because they offer complete amino acid profiles needed for collagen synthesis.
Dairy is the most calcium-dense protein source available in the typical Canadian diet. It provides both nutrients simultaneously, making it especially efficient for bone health.
Canned Pacific salmon (sockeye or pink) with bones is a standout bone health food that is inexpensive and widely available at Canadian grocery stores. The soft, edible bones are the calcium source — don't discard them.
Canned salmon offers the same protein and calcium density as dairy in a single serving and is a practical choice for people who don't eat dairy. Sardines with bones (also widely available) provide similar benefits.
Firm tofu set with calcium sulfate is a meaningful calcium source for people avoiding dairy. The key detail is the coagulant: tofu set with calcium sulfate contains approximately 260mg calcium per 100g. Tofu set with nigari (magnesium chloride) contains much less. Check the ingredient list.
Legumes are a valuable protein source for vegetarians and omnivores alike. They contain less calcium than dairy or canned salmon but provide significant protein volume and also supply magnesium, which supports bone mineral density.
Eggs provide 6g of high-quality, complete protein per egg with excellent amino acid profiles for tissue repair. Calcium contribution is small. They're a practical, affordable daily protein source for older Canadians.
Lean meats and poultry provide 25–30g protein per 100g cooked — among the highest protein densities available. They contain no calcium but provide a complete amino acid profile, including glycine and proline that are required for collagen synthesis. Chicken thighs, turkey, beef, and pork all qualify.
Spreading protein intake across meals, rather than concentrating it at dinner, appears to improve muscle protein synthesis in older adults. Aim for 20–30g per meal rather than 5g at breakfast and 60g at dinner.
| Meal Idea | Approximate Protein | Bonus Calcium? |
|---|---|---|
| 175g Greek yogurt + 1 tbsp chia seeds | ~19g | Yes (~250mg) |
| 2 eggs + 30g cheese scrambled | ~19g | Yes (~220mg) |
| Half can salmon (85g) with salad | ~25g | Yes (~240mg) |
| 100g firm tofu stir-fry | ~10g | Yes (~260mg, if calcium sulfate) |
| 100g chicken thigh, cooked | ~27g | No |
| 200g cooked lentils in soup | ~18g | Modest |
There are no known interactions between dietary protein and bisphosphonates, teriparatide, romosozumab, or denosumab. Protein intake does not need to be timed around or away from any osteoporosis medication.
The one thing to keep separate: bisphosphonates (alendronate, risedronate) must be taken on an empty stomach with a full glass of water, 30–60 minutes before food or other medications. This is about absorption, not protein specifically — any food, including protein, reduces bisphosphonate absorption significantly. See the calcium supplements guide for timing considerations when taking both medications and supplements.
Adding one 250mL glass of milk or one 175g container of Greek yogurt daily provides approximately 300mg calcium and 8–17g protein simultaneously. No other single food change delivers both nutrients in one step at comparable cost.
For people who tolerate dairy, this is the most efficient single dietary intervention for bone health beyond what any supplement can provide. Supplements replace individual nutrients — dairy replaces protein and calcium together in the form and ratio found in a bone-relevant food.
If dairy doesn't work for you — lactose intolerance, allergy, or preference — combining canned salmon with bones and a calcium supplement achieves the same nutritional goal. See the calcium intake guide and calcium and vitamin D together guide for how to build adequate intake across multiple food sources and supplements.
For a broader look at bone-supportive eating patterns, see bone health foods.