While macronutrients get the headlines, —vitamins and minerals—are the unsung heroes of cellular function. They're needed in small amounts but are absolutely essential.
Every energy molecule you produce requires B vitamins. Every muscle contraction needs magnesium. Every immune response requires zinc and vitamin D. Without adequate micronutrients, the cellular machinery simply doesn't work properly.
This lesson covers the key micronutrients for longevity, common deficiencies, and how to ensure you're getting enough.
Learning Objectives
- •Understand the role of key vitamins and minerals
- •Identify common micronutrient deficiencies
- •Explain the relationship between micronutrients and cellular function
- •Recognize food sources for critical micronutrients
- •Evaluate when supplementation might be necessary
Vitamins: Organic Essentials
Fat-Soluble Vitamins (A, D, E, K):
Stored in body fat; don't need daily intake but can accumulate to excess.
Vitamin D: The "longevity vitamin"
- Function: Immune regulation, bone health, muscle function, gene expression
- Sources: Sunlight (UVB), fatty fish, fortified foods
- Deficiency: Extremely common (40-75% of population)
- Optimal level: 40-60 ng/mL (controversial, but above 30 minimum)
- Longevity link: Low D associated with all-cause mortality
Vitamin K2:
- Function: Directs calcium to bones, away from arteries
- Sources: Fermented foods (natto), animal products
- Often overlooked but important for cardiovascular health
Water-Soluble Vitamins (B-complex, C):
Not stored well; need regular intake.
B Vitamins:
- B1 (Thiamine): Energy metabolism
- B2 (Riboflavin): Antioxidant, energy
- B3 (Niacin): NAD+ precursor (!)
- B6: Neurotransmitter synthesis
- B9 (Folate): DNA methylation, cell division
- B12: Nerve function, DNA synthesis
- Deficiency common in elderly and vegans
Vitamin C:
- Antioxidant, collagen synthesis, immune function
- Humans can't synthesize it (unlike most animals)
- Sources: Fruits, vegetables
Vitamin D Is Actually a Hormone
Vitamin D functions more like a hormone than a vitamin, affecting gene expression in nearly every tissue. Deficiency is associated with increased risk of nearly every chronic disease. Given limited sun exposure and few food sources, supplementation is often necessary.
Minerals: Inorganic Essentials
Magnesium: The relaxation mineral
- Function: 300+ enzyme reactions, muscle/nerve function, blood sugar control
- Deficiency: 50-80% of population may be insufficient
- Symptoms: Muscle cramps, poor sleep, anxiety, fatigue
- Sources: Leafy greens, nuts, seeds, dark chocolate
- Forms for supplementation: Glycinate, threonate, citrate (not oxide)
Zinc: Immune and metabolic function
- Function: Immune response, wound healing, taste/smell, protein synthesis
- Deficiency: Common in elderly, vegetarians
- Sources: Oysters, red meat, poultry, beans, nuts
- Caution: Don't over-supplement (can impair copper absorption)
Iron: Oxygen transport
- Function: Hemoglobin, energy production
- Deficiency: Most common worldwide, especially in women
- Excess: Can be harmful (oxidative stress)—test before supplementing
Selenium: Antioxidant defense
- Function: Glutathione production, thyroid function
- Sources: Brazil nuts (1-2 per day is sufficient), fish, meat
Potassium: Fluid balance, nerve function
- Most people don't get enough
- Sources: Bananas, potatoes, leafy greens, beans
Quick Check
Which micronutrient deficiency is MOST common in the general population?
Micronutrients and Longevity Pathways
NAD+ Pathway:
- B3 (niacin, nicotinamide) is a precursor to NAD+
- Adequate B vitamins support NAD+ synthesis
Methylation (Epigenetics):
- Folate (B9) and B12 are essential for methylation
- Deficiency impairs DNA methylation patterns
- Affects gene expression and aging
Antioxidant Defense:
- Selenium: Required for glutathione peroxidase
- Zinc: Required for superoxide dismutase
- Vitamin C & E: Direct antioxidants
Mitochondrial Function:
- B vitamins: Cofactors in energy production
- Magnesium: Required for ATP synthesis
- CoQ10: Though not technically essential, is critical
Immune Function:
- Vitamin D: Regulates immune response
- Zinc: T-cell function
- Vitamin C: Supports immune cells
The Magnesium Depletion Problem
Modern agriculture has depleted soil magnesium by ~80%. Processing food removes more. Stress depletes magnesium. Exercise depletes it. Alcohol depletes it. The result: most people are insufficient even with 'good' diets. Supplementation is often practical.
Food First, Supplements Second
Why food is preferred:
- Nutrients in natural matrix (better absorption)
- Synergistic compounds
- Harder to overdose
- Other beneficial components (fiber, phytochemicals)
When supplements make sense:
- Vitamin D (sun exposure inadequate)
- B12 (vegans, elderly)
- Magnesium (widespread deficiency, hard to test)
- Omega-3 (if not eating fatty fish 2x/week)
- Deficiency identified by testing
How to maximize food intake:
- Eat colorful vegetables (different colors = different nutrients)
- Include organ meats occasionally (nutrient dense)
- Eat fatty fish 2x/week
- Include nuts and seeds
- Don't fear egg yolks
- Consider fermented foods
Bioavailability considerations:
- Vitamin C increases iron absorption
- Fat increases absorption of A, D, E, K
- Phytates (in grains/legumes) reduce mineral absorption
- Cooking can increase or decrease availability depending on nutrient
True or False
If you eat a healthy diet, you don't need to worry about any micronutrient deficiencies.
Summary
- →Vitamin D deficiency is extremely common and affects immunity, bones, and gene expression
- →B vitamins are essential cofactors for energy production and NAD+ synthesis
- →Magnesium deficiency is widespread due to soil depletion and affects 300+ enzymes
- →Zinc is critical for immune function; deficiency common in elderly
- →Micronutrients directly affect longevity pathways: NAD+, methylation, antioxidant defense
- →Food should be the primary source, with targeted supplementation for likely deficiencies
Quick Check
A 65-year-old on a plant-based diet should particularly watch for deficiency in:
Next: Metabolic Health—understanding blood sugar, insulin, and how to maintain metabolic flexibility for energy and longevity.