I have found that you can dissolve eggshell in lemon juice and get all the calcium you need without eating a lot of vegetables:
Eggshells present healthy, balanced calcium due to trace amounts of other minerals contained in it. Eggshell calcium is probably the best natural source of calcium, and it is easier for your body to digest and absorb. Dutch researchers have reported recently a highly positive effect of eggshell calcium (with added magnesium and vitamin D) on bone mineral density in a scientific study (double blind, placebo-controlled). Laboratory test and measures of bone density were carefully made in these studies. The eggshell supplemented group had measurable increases in bone density in their hip bones, after one year
http://nourishedmagazine.com.au/blog/ar ... egg-shells
Are there some side effects of this method?