Calcium is not only essential for healthy bones but also aids muscle contraction, heart action, vitamin B-12 absorption and blood clotting. Hypoglycemia (low calcium) can affect the nervous system and cause spasms, muscle cramps, abdominal cramps etc.
Calcium deficiency can lead to poor mineralisation of bones, osteoporosis etc. Foods containing calcium include dairy products, broccoli, spinach, salmon, oysters, tofu etc.
The ideal daily intake of calcium is 1,000 to 1,300 milligrams. Over 2,500 milligrams per day can lead to hyperglycaemia and associated problems.
cancerresearchuk.org/about-cancer/coping-with-cancer/coping-physically/calcium