Manganese

Manganese is an essential trace mineral that supports various enzymatic processes, bone development, and antioxidant defense. It is vital for energy production, connective tissue formation, and brain function.

Manganese RDA (Recommended Dietary Allowance):

• Men (19+ years): 2.3 mg/day
• Women (19+ years): 1.8 mg/day
• Pregnant women: 2.0 mg/day
• Breastfeeding women: 2.6 mg/day
• Children (varies by age): 1.2-1.9 mg/day

ODA (Optimal Daily Allowance):

• 2-5 mg/day (depending on individual needs and activity levels)

Found in:

• Whole grains (brown rice, oats, quinoa)
• Nuts and seeds (hazelnuts, pecans, sunflower seeds)
• Leafy green vegetables (spinach, kale)
• Legumes (lentils, chickpeas, soybeans)
• Fruits (pineapple, blueberries, strawberries)
• Tea (especially black and green tea)
• Spices (cloves, cinnamon, black pepper)

Helps with:

• Supporting enzymatic reactions involved in metabolism
• Forming connective tissue, cartilage, and bones
• Acting as a cofactor for antioxidant enzymes like superoxide dismutase (SOD)
• Promoting brain function and neurotransmitter synthesis
• Assisting in blood sugar regulation and calcium absorption

Insufficient doses:

• Symptoms of deficiency:
  • Weak bones or skeletal abnormalities
  • Impaired glucose tolerance
  • Fatigue or reduced energy production
  • Poor wound healing
  • Neurological symptoms (rare)
• Deficiency is uncommon due to its presence in many plant-based foods.

Excessive doses:

• Upper limit: 11 mg/day for adults
• Possible side effects of excessive manganese intake:
  • Neurological symptoms (e.g., tremors, muscle spasms, or memory issues) from chronic overexposure
  • Manganese toxicity, particularly in individuals with impaired liver function or high occupational exposure

Interactions:

• Synergy:
  • Works with calcium, magnesium and phosphorus for bone health.
  • Acts with antioxidants like vitamin C and vitamin E to reduce oxidative stress.
• Antagonistic interactions:
  • Excessive iron intake can interfere with manganese absorption.
  • High levels of calcium or magnesium may reduce manganese bioavailability.
  • Phytates in grains and legumes can limit manganese absorption, although these foods are also good sources of the mineral.