Women lose between 1 and 3 percent of bone mineral density per year in the first decade after menopause. Over a decade, this can represent a 15 to 30 percent reduction in bone density if nothing is done to counteract it. Diet is not a complete solution to this loss in the way that hormone replacement therapy is, but the evidence shows clearly that inadequate nutrient intake substantially worsens the trajectory, while a well-designed dietary pattern meaningfully slows it.
Calcium from Whole Foods
Calcium supplements have a mixed evidence record for bone protection and have been associated with increased cardiovascular risk in some studies when used at high doses. Calcium from food does not carry this risk and is better absorbed and utilised. The target is 700mg per day from dietary sources for adults, rising to 1,200mg for post-menopausal women at risk of osteoporosis. Dairy foods remain the most bioavailable calcium source per serving. Non-dairy sources include tinned sardines and salmon with bones, tofu set with calcium sulphate, almonds, and dark leafy greens.
Vitamin K2 and Bone Mineralisation
Vitamin K2 is required to activate osteocalcin, a protein produced by osteoblasts that binds calcium into the bone matrix. Without adequate K2, calcium cannot be incorporated into bone regardless of how much is consumed. K2 also activates matrix Gla protein which prevents calcium from depositing in arterial walls. Dietary sources of K2 are limited but include fermented foods, particularly natto and aged hard cheeses, egg yolks, and chicken liver.
The Role of Protein in Bone Health
For decades, dietary protein was considered detrimental to bone health based on the theory that metabolic acid from protein catabolism leached calcium from bone. This theory has been consistently contradicted by the evidence. Higher protein intake is now associated with higher bone density and lower fracture risk in prospective studies. Protein provides the structural matrix of bone. Adequate protein intake, combined with resistance training, is essential for bone maintenance after menopause.