Japanese study of mice fed a yeast extract fortified with either zinc or other minerals. Only the zinc-fed mice experienced a "drastic reduction" in movement at sleep time, and electrical brain recordings showed an increase in the amount of high-quality slow-wave sleep.

The researchers believe that once a certain blood level of zinc is reached, it crosses into the brain and activates signaling pathways to promote sleep. "Our data," they say, "open the way to new types of food supplements designed to improve sleep."

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05.05.2019 | 11:42

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Zinc is the second most common trace element in the human body, after iron.

Supplements of zinc, often combined with other nutrients, improve sleep time.

In depressed patients, low serum zinc levels may be a biomarker for resistance to antidepressant drugs.

Studies show that zinc is required for the efficacy of antidepressant drugs.

Zinc deficiency increases the oxidative stress on mitochondria.

Zinc is essential for prostate function and male fertility.

Because it is a component of so many enzymes, zinc is found throughout the body, but it is especially concentrated in muscle, bone, and the liver.

Normal growth during development depends on adequate levels of zinc.

Appetite regulation requires zinc; deficiency of the mineral leads to decreased appetite.

The RDA for zinc is 11 mg/day for males over age 14 and 8 mg/day for females 19 and older.

Foods with high levels of zinc include oysters, red meat, and wheat germ.

Signs of zinc deficiency include growth retardation, delayed sexual maturation, eye and skin lesions, and appetite loss.