Maple syrup is an excellent source of the trace minerals manganese, magnesium, calcium, potassium, selenium and zinc.
The trace mineral manganese is an essential cofactor in a number of enzymes important in energy production and antioxidant defenses.
For example, the key oxidative enzyme superoxide dismutase, which disarms free radicals produced within the mitochondria (the energy production factories within our cells), requires manganese. One ounce of maple syrup supplies 22.0% of the daily value for this very important trace mineral.
Maple syrup is a good sweetener to use if you are trying to protect the health of your heart. The zinc supplied by maple syrup, in addition to acting as an antioxidant, has other functions that can decrease the progression of atherosclerosis. Zinc is needed for the proper function of endothelial cells and helps to prevent the endothelial damage caused by oxidized LDL cholesterol and other oxidized fats. (The endothelium is the inner lining of blood vessels.) Endothelial membranes low in zinc are much more prone to injury. Additionally, studies have found that in adults deficient in manganese, the other trace mineral amply supplied in maple syrup, the level of HDL (the "good" cholesterol) is decreased.
Zinc and manganese are important allies in the immune system. Many types of immune cells appear to depend upon zinc for optimal function. Particularly in children, researchers have studied the effects of zinc deficiency (and zinc supplementation) on their immune response and their number of white blood cells, including specific studies on T lymphocytes, macrophages, and B cells (all types of white blood cells important for immune defenses). In these studies, zinc deficiency has been shown to compromise numbers of white blood cell and immune response, while zinc supplementation has been shown to restore conditions to normal.
Maple syrup may help to support reproductive health and provides special benefits for men. Zinc is concentrated more highly in the prostate than in any other human tissue, and low levels of zinc in this gland relate to a higher risk for prostate cancer. In fact, zinc is a mineral used therapeutically by healthcare practitioners to help reduce prostate size. Manganese may also play a role in supporting men's health since, as a catalyst in the synthesis of fatty acids and cholesterol, it also participates in the production of sex hormones, thus helping to maintain reproductive health.