Magnesium deficiency is commonest in people who avoid green vegetables, never eat wholemeal bread, nuts or seeds and drink only de-mineralised water. Try eating more green leafy vegetables and a handful of sunflower or pumpkin seeds every day - or take a Magnesium supplement. If the cramps do not resolve reduce the Vitamin D and consult your doctor.

Magnesium is better absorbed from foods than from supplements. Magnesium is at the heart of the green chlorophyll molecule, which is why dark green vegetables such as spinach are a good source of Magnesium. Other good sources are nuts, seeds, whole grains and dried fruits such as apricots and raisins. The richest source by weight is dried seeds, like pumpkin, sunflower, and sesame seeds.