Caffeine:
https://www.medicalnewstoday.com/articles/caffeine-and-
osteoporosishttps://www.verywellhealth.com/caffeine-and-osteoporosis-

6829369https://www.unisa.edu.au/media-centre/Releases/2021/caffeine-cuts-close-to-the-bon--when-it-comes-to-osteoporosis#

From WebMD:Osteoporosis diet danger 3: the cost of caffeine:

Caffeine leaches calcium from bones, sapping their strength. For every cup of coffee you drink, you may lose about 4 milligrams of calcium.

That's not as much of a loss as from salt, but it's still worrisome. Caffeine is a particular problem for those who don’t get enough calcium each day to begin with.

The good news is that adding a 1-2 tablespoons of milk to your coffee probably offsets any calcium losses that caffeine causes.

Coffee is a major caffeine source. For example, a 16-ounce cup of coffee can provide 192 milligrams of caffeine. High-caffeine sodas can contain up to 33 milligrams per can or more.

Although tea also contains caffeine, studies suggest it doesn't harm, and probably helps, bone density in older women, regardless of whether they add milk to the beverage. Researchers think that tea has plant compounds that help protect your bones.