After 50, women need 1,200 mg of calcium and 600 IU of vitamin D a day, and food is a reasonable way to reach the calcium target but a poor way to reach the vitamin D one. Leafy greens can contribute real calcium, but only some of them count, because oxalic acid in spinach and collard greens binds most of the calcium those plants contain before you can absorb it.
This page exists because of a narrower question. On September 9, 2026, The New York Times published a piece by Danielle Friedman on whether women should get a DEXA bone density scan at menopause rather than waiting until 65, as most guidelines advise. The reporting is about screening, and its dietary advice is a single line: eat a diet rich in calcium and vitamin D. What follows is the longer version of that line, including the parts that are inconvenient.
What actually happens to bone at menopause
Bone is living tissue that is broken down and rebuilt continuously. When estrogen falls, the breakdown side speeds up relative to the rebuilding side. According to the National Institutes of Health Office of Dietary Supplements, women lose roughly 1 percent of their bone mineral density per year after menopause, and about 30 percent of postmenopausal women in the United States and Europe have osteoporosis. At least 40 percent of those women go on to have a fragility fracture, meaning a break from a fall at standing height or less.
Two other things change at the same time and are easy to miss. Falling estrogen reduces how much calcium you absorb and increases how much you lose in urine. And calcium absorption declines with age on its own, from about 25 percent in adulthood downward. So the requirement goes up at exactly the point the machinery gets less efficient, which is why the recommended intake rises at 51.
What you need after 50
| Nutrient | Women 51 to 70 | Women over 70 | How realistic is food alone |
|---|---|---|---|
| Calcium | 1,200 mg/day | 1,200 mg/day | Achievable, but it takes deliberate effort without dairy |
| Vitamin D | 15 mcg (600 IU)/day | 20 mcg (800 IU)/day | Difficult. Very few foods contain it naturally |
| Vitamin K | 90 mcg/day (Adequate Intake) | 90 mcg/day | Easy. One cup of raw kale covers it |
Calcium and vitamin D are the pair that matters, and they are not interchangeable. Vitamin D is required for calcium to be absorbed by active transport in the gut, so a high calcium intake with poor vitamin D status underperforms.
Not all greens count the same, and this is the part most articles get wrong
The phrase "leafy greens are high in calcium" is doing a lot of work that it cannot support. Oxalic acid and phytic acid in some plants bind calcium into salts you cannot digest. The difference is not marginal.
| Food | Calcium per serving | Roughly how much you absorb |
|---|---|---|
| Milk, nonfat, 1 cup | 299 mg | About 27 percent |
| Spinach, boiled, 1/2 cup | 123 mg | About 5 percent |
| Kale, cooked, 1 cup | 94 mg | Similar to milk |
| Turnip greens, boiled, 1/2 cup | 99 mg | Similar to milk |
| Bok choy, raw, shredded, 1 cup | 74 mg | Similar to milk |
| Broccoli, raw, 1/2 cup | 21 mg | Similar to milk |
| Tofu, firm, set with calcium sulfate, 1/2 cup | 253 mg | Good |
| Sardines, canned with bones, 3 oz | 325 mg | Good |
Spinach is the clearest example. It looks like a calcium food on a label and behaves like one only weakly in a body, because roughly 5 percent of its calcium is absorbable against about 27 percent for milk. Collard greens, sweet potatoes, rhubarb and beans are also high in oxalic acid. Broccoli, kale and cabbage do not have the same problem, and their calcium is absorbed about as well as the calcium in milk. The catch is the amount: there is far less of it per serving.
That produces a useful rule of thumb. One cup of cooked kale gives you about 94 mg of calcium at roughly milk-like absorption, so it takes about three cups of cooked kale to match the calcium in one cup of milk. Kale is worth eating for many reasons. Replacing dairy one for one is not one of them.
The National Institutes of Health adds a caveat worth repeating, because it cuts against the alarmism: when people eat a varied diet, these interactions with oxalic and phytic acid probably have little or no nutritional consequence. The problem is not that spinach steals calcium from the rest of your day. It is that spinach cannot be the plan.
Vitamin K: where greens genuinely lead, and what that does and does not buy you
Vitamin K1 comes overwhelmingly from green vegetables, and here the numbers are lopsided in their favor. Vitamin K is a cofactor for carboxylating osteocalcin, one of the main proteins in bone.
| Food | Vitamin K per serving | Percent Daily Value |
|---|---|---|
| Collards, frozen, boiled, 1/2 cup | 530 mcg | 442% |
| Turnip greens, frozen, boiled, 1/2 cup | 426 mcg | 355% |
| Spinach, raw, 1 cup | 145 mcg | 121% |
| Kale, raw, 1 cup | 113 mcg | 94% |
| Broccoli, chopped, boiled, 1/2 cup | 110 mcg | 92% |
Now the honest part. Some studies link higher vitamin K intake with higher bone mineral density and lower hip fracture rates, and some do not. The National Institutes of Health states plainly that it is unclear whether supplementing with any form of vitamin K reduces osteoporosis risk. A 2006 systematic review of trials, mostly in Japanese postmenopausal women, found benefit at pharmacological doses of MK-4 far above anything you get from food. Later trials in older adults found no effect on bone mineral density at all. Eat your greens because the overall evidence for vegetables is strong. Do not eat them because you have been told vitamin K is a proven fracture treatment, because that is not what the literature says.
One caution that matters more than the rest of this page. If you take warfarin or a similar anticoagulant, you should not swing your vitamin K intake up or down. The instruction is consistency, not avoidance. Talk to whoever manages your dosing before changing how many greens you eat.
Where SaladPower fits, and where it does not
We make a drinkable vegetable pouch, so the honest thing to do here is give you our numbers rather than a pitch. Per 8 oz pouch:
| Nutrient | Per pouch | Percent DV | Verdict |
|---|---|---|---|
| Calcium | 70 mg | 6% | Supplementary source |
| Vitamin K | 9 mcg | 8% | Supplementary source |
On the two bone nutrients a pouch contains, the amounts are supplementary rather than headline, so treat SaladPower as one contributor among several rather than your calcium plan. The heavy lifting for bone density comes from dairy or calcium-set tofu or canned fish with bones, a vitamin D supplement if your doctor recommends one, and resistance training. What a pouch does is deliver 2x the USDA daily recommended vegetable intake in a form you will actually finish, which is a different and more general benefit. We wrote about what SaladPower is and is not good for in full, including the nutrients a pouch provides in smaller, supplementary amounts.
What actually protects bone
The experts quoted in the Times reporting converge on an unglamorous list, and diet is only one item on it.
- Weight-bearing and resistance exercise. All resistance training helps. What matters is progressively increasing the challenge over time, not lifting the heaviest possible weight.
- Balance and mobility work. Most fractures come from falls, so not falling is its own intervention.
- Eating enough total calories. Underfueling is a risk factor, and a history of disordered eating is on the standard risk list.
- Calcium and vitamin D at the recommended amounts.
- Not smoking, and limiting alcohol.
Hormone therapy is a separate conversation with a clinician. The reason the Times piece argues about scan timing at all is that estrogen therapy is most effective and safest when started within about ten years of menopause, so knowing your bone density at that decision point can change the decision.
If you are working through the wider set of changes at this stage of life, we cover them in what to eat in perimenopause and menopause, which includes the requirement that goes down rather than up.
Frequently asked questions
How much calcium do women need after menopause?
1,200 mg per day for women older than 50, up from 1,000 mg for women aged 19 to 50. The higher figure is set specifically to lessen bone loss after menopause. The Tolerable Upper Intake Level for this group is 2,000 mg per day, so more is not automatically better.
Is spinach a good source of calcium?
No, despite the numbers on the label. Oxalic acid in spinach binds its calcium, and only about 5 percent is absorbed, against about 27 percent for milk. Kale, broccoli and cabbage do not have this problem and their calcium is absorbed about as well as milk's, but they contain much less of it per serving.
Can you get enough calcium without dairy?
Yes, but it requires planning rather than assuming. Calcium-set tofu at 253 mg per half cup, canned sardines with bones at 325 mg per 3 oz, calcium-fortified soy milk or orange juice at about 299 to 349 mg per cup, and beans do most of the work. Low-oxalate greens contribute but will not carry the total on their own.
Does vitamin K prevent fractures?
The evidence is mixed and the National Institutes of Health describes it as unclear. Some observational studies associate higher vitamin K intake with higher bone density and fewer hip fractures, others find nothing. Trials showing fracture reduction used MK-4 at doses far beyond food intake, and several later trials found no effect on bone mineral density.
Should I get a DEXA scan at menopause instead of at 65?
That is a question for your clinician, and it is genuinely unsettled. Current guidance is 65 for average-risk women, and no major medical organization endorses routine scanning of younger women without risk factors. A member of the U.S. Preventive Services Task Force quoted by the Times said women under 65 who are postmenopausal and have at least one additional risk factor should discuss earlier screening with their provider.
Sources
- Friedman D. "When Do Women Really Need a Bone Scan?" The New York Times, September 9, 2026. Read the original article
- National Institutes of Health, Office of Dietary Supplements. Calcium: Fact Sheet for Health Professionals. Recommended intakes, absorption rates, food composition table, and postmenopausal bone loss. Read September 10, 2026.
- National Institutes of Health, Office of Dietary Supplements. Vitamin K: Fact Sheet for Health Professionals. Adequate Intakes, food composition table, osteoporosis evidence review, and anticoagulant interaction. Read September 10, 2026.
- National Institutes of Health, Office of Dietary Supplements. Vitamin D: Fact Sheet for Health Professionals. Recommended Dietary Allowances by age. Read September 10, 2026.
- Institute of Medicine. Dietary Reference Intakes for Calcium and Vitamin D. Washington, DC: The National Academies Press; 2011. The source of the calcium and vitamin D reference values above.
- SaladPower Nutrition Facts panel, per 8 oz pouch.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
