Normally, the parathyroid glands release a hormone that increases blood calcium levels when they are low. Magnesium is required for the production and release of parathyroid hormone, so when magnesium is too low, insufficient parathyroid hormone is produced and blood calcium levels are also reduced (hypocalcemia).
Alcoholics have been found to have deficiencies in calcium, magnesium, iron, and zinc. Research shows that drinking alcohol itself does not limit the absorption of minerals, but alcohol-related problems do. Mineral deficiencies may be caused by other alcohol-related conditions: Magnesium deficiency due to poor diet.