Calcium is found in a wider range of foods than most people realise. The challenge is not that calcium-rich foods are rare. It is that many women are unaware of which foods contain meaningful amounts, and how those amounts compare to their daily needs.

CALLOUT: One serving of full-fat yoghurt typically contains more calcium than a glass of milk. One cup of cooked bok choy contains roughly the same as half a glass of milk. Calcium is hiding in more places than you might expect.

Dairy - the most concentrated sources

Dairy products remain the most efficient way to meet calcium needs through food. This is not because they are inherently superior, but because they contain calcium in a highly bioavailable form and in large amounts per serving.

Approximate calcium content per serving:

  • Full-fat or low-fat yoghurt (200g): 300–380mg
  • Milk from cow's, whole or reduced fat (250ml): 280–300mg
  • Hard cheese such as cheddar or parmesan (30g): 200–240mg
  • Ricotta (100g): 200mg
  • Cottage cheese (100g): 60–80mg which lower than other dairy

CALLOUT: Hard cheeses are one of the most concentrated sources of calcium per gram. A small portion of parmesan or cheddar provides a meaningful amount. You do not need large servings to make a difference.

Non-dairy sources - plant-based and seafood

For women who avoid dairy, or who simply want variety, the following are reliable calcium sources:

  • Fortified plant milks: soy, oat, almond, rice (250ml): 250–300mg, comparable to cow's milk if fortified. Check the label because unfortified plant milks contain very little calcium
  • Canned salmon with bones (100g): 200–240mg. The bones are the key, so do not discard them
  • Canned sardines with bones (100g): 350mg. These are one of the richest non-dairy sources available
  • Firm tofu set with calcium sulphate (100g): 200–300mg. Check the label, as calcium content varies significantly by setting agent
  • Edamame (100g cooked): 60mg
  • Almonds (30g): 75mg. This is useful as a contribution but not a primary source
  • Tahini/sesame paste (1 tablespoon): 85mg
  • Bok choy (1 cup cooked): 150mg
  • Kale (1 cup cooked): 90mg
  • Broccoli (1 cup cooked): 60mg. This is lower than often assumed
  • White beans/cannellini beans (100g cooked): 90mg
  • Fortified breakfast cereals: 100–200mg per serving, depending on brand so check the label

CALLOUT: Canned fish with bones, especially sardines, are one of the most underrated calcium sources. A small tin of sardines provides as much calcium as a large glass of milk. For women who eat fish, it is worth making it a regular part of the diet.

A note on bioavailability

Not all dietary calcium is equally absorbed. The body absorbs approximately 30–35 percent of calcium from dairy and most fortified foods. From plant sources, absorption varies:

  • Calcium from bok choy, kale, and broccoli is well absorbed. Similar to dairy
  • Calcium from spinach and rhubarb is poorly absorbed because these vegetables are high in oxalates, which bind to calcium and prevent absorption. Spinach is not a reliable calcium source despite its reputation
  • Phytates in wholegrains and legumes can reduce calcium absorption, though soaking and cooking reduce this effect

QUOTE: "Building stronger bones through food is less about perfection and more about pattern. A diet that regularly includes dairy or its alternatives, oily fish, leafy greens, and legumes is doing far more for your bones than any single superfood ever could."

How to estimate your daily intake

A rough daily calcium audit:

  • One serve of dairy or fortified plant milk: approximately 300mg
  • One serve of hard cheese: approximately 200mg
  • One serve of canned fish with bones: approximately 200–350mg
  • Two serves of calcium-rich vegetables: approximately 150–200mg combined
  • Background calcium from bread, cereals, and other foods: approximately 200–300mg

A woman eating two to three serves of dairy or equivalent per day, plus a varied diet, is likely getting close to 1,000–1,200mg. She may need little or no supplementation. A woman who avoids dairy and does not regularly eat fortified alternatives or canned fish may be significantly short.

CALLOUT: If you are unsure whether you are meeting your calcium needs through food, this is worth discussing with your doctor or a dietitian. A brief dietary review can identify gaps quickly and often reveals that targeted food choices are more effective than additional supplementation.