Also read what
@Miss Lydia posted!!!! It explains what I keep meaning to say.
First, the oxalic acids in spinach and other dark green veggies negate the calcium in the foods. Although the foods are high in calcium, they are also high in oxalic acids; and, it is recommended
not to rely on those foods for calcium.
Second, if you look at the second link that the blogger sited (because the first link does not directly go to the info and the 3rd link is a dead link), the vinegar supposedly helps the body to absorb calcium. Even that source did not have cited sources and if the articles are read words like "might" and "may" are used.
https://health.howstuffworks.com/wellness/food-nutrition/facts/the-health-benefits-of-vinegar3.htm
"If there is one thing vinegar fans, marketers, alternative therapists, and scientists alike can agree on, it's that vinegar is high in acetic acid. And acetic acid, like other acids, can increase the body's absorption of important minerals from the foods we eat. Therefore, including apple cider vinegar in meals or possibly even drinking a mild tonic of vinegar and water (up to a tablespoon in a glass of water) just before or with meals
might improve your body's ability to absorb the essential minerals locked in foods."
"Dark, leafy greens are good sources of calcium, but some of these greens also contain compounds that inhibit calcium absorption. Fortunately for dairy-deprived women (and even those who do drink milk), a few splashes of vinegar or a tangy vinaigrette on their greens
may very well allow them to absorb more valuable calcium. Don't you wish all medications were so tasty?"
The blogger of the site above, who is constantly cited as a source on byc, often has misinfo on her blog and in her book. A reliable source to me is not a blogger unless they have reliable cited their info.
