> We need calcium in our diet, but sufficient calcium is easily available
> from many non-dairy sources. Hard drinking water generally contains
> plenty of usable calcium. All green vegetables contain calcium, as do
> all nuts, legumes and beans. Raw sesame seeds contain more calcium than
> any other food on earth. Most fruit also contains calcium.
>
I've heard that the oxalic acid in greens such as spinach interfere with
calcium absorption in foods such as sesame seeds. Any opinions?