It appears that zinc is not only critical for thyroid function, but also for maintaining levels of the hormone leptin. When the subjects took 25 mg of zinc each day for 20 days, their metabolic rate jumped up to levels that were higher than even before they followed the low-zinc diet.* The Selcuk University studies also showed that four weeks of zinc supplementation increased thyroid hormone levels in male wrestlers and sedentary men.
One study from the University of Massachusetts (Amherst) found that subjects placed on a low-zinc diet had significantly lowered metabolic rates. Research confirms that when your diet is low in zinc, thyroid hormone levels fall and resting metabolic rate drops. Being low in zinc can limit thyroid hormone production, and compromised thyroid hormone function results in a lower metabolic rate, which makes it harder to drop body fat. This is important for keeping your metabolic rate (the amount of calories you burn each day) and fat-burning capabilities up. Zinc is also critical for maintaining thyroid hormone production. This is critical, as deeper sleep can help to raise GH levels, which peak during the night. ZMA enhances sleep quality due to magnesium's ability to normalize and extend stage 3 and stage 4 slow-wave sleep. ZMA may also boost growth hormone (GH) levels, albeit indirectly. And Brazilian researchers also reported that subjects supplementing with zinc maintained healthy cortisol balance. German researchers found that triathletes taking a magnesium supplement for four weeks maintained healthy cortisol levels at rest and after a triathlon, as compared to athletes taking a placebo. The same Western Washington University research team that did the ZMA research also discovered in an earlier study that when subjects supplemented with magnesium while following a 7-week leg training program, their leg strength increased by 20-percent more than those taking a placebo.*īoth zinc and magnesium are also suggested to blunt cortisol, a catabolic hormone. In addition to the study performed by the Western Washington University researcher, several other studies have also found that zinc and magnesium offer potent anabolic properties.* These benefits occurred in the ZMA group despite the fact that the analyses of their diets found that the athletes were all consuming well over the recommended intake for zinc. Better sleep quality also helps to aid muscle recovery from tough workouts. In addition to the improvements in their anabolic hormone levels, the ZMA-supplemented athletes made significantly greater gains in strength and power, and achieved better sleep quality, than a placebo group. They reported that the athletes taking the ZMA supplement experienced more than a 30-percent increase in testosterone levels, and about a 5-percent increase in levels of the insulin-like growth factor 1 (IGF-1).* Those taking a placebo had a 10-percent decrease in testosterone levels and a greater than 20-percent decrease in levels of IGF-1. A study performed at Western Washington University (Bellingham) had NCAA football players take ZMA or a placebo every night during an eight-week spring training program. Research suggests that ZMA has significant anabolic benefits. In fact, numerous research studies have suggested that these two minerals help enhance muscle size, muscle strength, and fat loss, not to mention overall health and well-being.* Anabolic Factors It's important for healthy function of the cardiovascular system, metabolic rate, and of course bone health.* Together, zinc and magnesium offer a wide assortment of physique and performance benefits.
Magnesium is also an essential mineral involved in numerous reactions in the body.
Numerous research studies have suggested that zinc and magnesium help enhance muscle size, muscle strength, and fat loss, not to mention overall health and well-being.*
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