Last reviewed: July 2026 · SecondFyre Alkemy Kitchen
Bone density peaks around age 30 and slowly declines from there. In the years around the menopause transition, that decline accelerates — dramatically. Women can lose 10-20% of bone density in the 5-10 years around menopause. This is the window where what you eat matters most for your skeletal health for the rest of your life.
Most discussions of bone health collapse into “drink milk and take calcium.” The reality is significantly more complex, and the calcium narrative has crowded out several interventions with equal or greater evidence.
Calcium: The Real Story
Calcium is important. The target for women over 50 is 1,200mg daily. Getting that from food is preferable to supplements — high-dose calcium supplements (1,000mg or more) have been associated in some studies with cardiovascular events, possibly because supplemental calcium produces rapid spikes in blood calcium that dietary calcium doesn’t.
Dairy is the most discussed calcium source but not the only one. Tinned sardines and salmon with bones, tofu made with calcium sulfate, fortified plant milks, almonds, white beans, kale, and broccoli all contribute meaningfully. A varied diet that includes several of these daily achieves good calcium intake without supplements.
Vitamin D: The Prerequisite
Calcium cannot be properly absorbed without adequate vitamin D. Most women are deficient — particularly those living above 37 degrees latitude for most of the year, those who work indoors, and those with darker skin (which produces less vitamin D from sunlight). A blood test (25-hydroxyvitamin D) tells you where you are. The target is 75-125 nmol/L (30-50 ng/mL). Below this, calcium supplementation is largely wasted.
Food sources of vitamin D are limited: fatty fish, egg yolks, fortified foods. Most people who are deficient need supplementation — typically 1,000-2,000 IU daily for maintenance; higher doses under medical supervision for correction.
Vitamin K2: The One Everyone Misses
Vitamin K2 (specifically MK-7) directs calcium to bone rather than blood vessel walls. It activates osteocalcin, the protein that binds calcium into bone matrix, and activates matrix GLA protein, which prevents calcium from depositing in arteries. Without adequate K2, calcium supplementation may literally go to the wrong places.
K2 is found in fermented foods — natto (Japanese fermented soybeans has extraordinary amounts), some aged cheeses, and certain fermented dairy products. Western diets are typically very low in K2. Supplementation with MK-7 at 100-200mcg daily is worth discussing with your doctor, particularly if you’re supplementing calcium.
Protein: Underemphasised for Bones
Bone is not just calcium. It is calcium embedded in a collagen protein matrix. Adequate dietary protein is essential for maintaining that matrix. Low protein intake in older women is independently associated with lower bone density and higher fracture risk. The bone health argument for adequate protein intake runs alongside the muscle mass argument.
What to Eat Daily
Tinned sardines or salmon with bones (2-3 times weekly). Dark leafy greens — kale, bok choy, broccoli — at most meals. Legumes daily. Greek yoghurt or kefir. Tofu (calcium-set). Almonds. Fermented foods including aged cheese. Ground flaxseed. These together, with adequate protein at every meal, build a dietary foundation for bone health that supplements alone cannot match.
And strength training. The dietary interventions for bone are most effective alongside weight-bearing exercise that provides the mechanical stimulus that tells bone to maintain and rebuild. Eat for your bones. Then go lift something.
Last reviewed: July 2026 · SecondFyre Editorial
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