What is the relationship among calcium, estrogens and vitamin D?

It is very simple, for the absorption of calcium from our intestine to blood we need estrogens and vitamin D. If you have deficiency of estrogens, vitamin D or both you can also have less absorption of calcium which may lead to osteoporosis.

It is more difficult to keep the absorbed calcium in our body and several factors such as, the amount of calcium or the amount of vitamin D, or sodium or protein has a good or very bad influence on it. Too much from these food or nutrients are bad for calcium metabolism.

The estrogens production is slowly reduced during the pre-menopausal period and in post-menopausal the concentration is very low. Estrogens replacement therapy or enough vitamin D intake is, therefore, very important for women’s health.

The phytoestrogens from soya beans or other vegetables can also replace estrogens replacement therapy.

Relationship between spinach, tomato and the formation of kidney stones

90% of the kidney-stones are calcium oxalate stones.

Although spinach is very healthy, it has lot of oxalic acid. If you have problem with kidney stones, you can eat it moderately and also drink at least 4 litres of water. There are several other vegetables having oxalates. Soya bean has the maximum amount of oxalates.

There is no oxalic acid present in tomato and you can use it wherever you like in your food.