Zinc

Sources of Zinc

Animal Sources

Meat, especially red meat, poultry, and seafood (oysters contain particularly high levels).

Plant Sources

Whole grains, legumes, nuts, and seeds.

Fortified Foods

Breakfast cereals and other foods often fortified with zinc.

Functions of Zinc

Immune Function: Zinc is essential for the development and function of immune cells.

Wound Healing: Plays a role in skin integrity and structure, aiding in wound healing.

DNA Synthesis: Crucial for cell division and DNA synthesis.

Protein Synthesis: Involved in protein building and metabolism.

Growth and Development: Essential for growth and development in infants, children, and adolescents.

Taste and Smell: Zinc is vital for maintaining the sense of taste and smell.

Effects of Zinc Deficiency

Growth Retardation: In children, zinc deficiency can lead to stunted growth.

Weakened Immune System: Leads to increased susceptibility to infections.

Wound Healing Delays: Slow or impaired wound healing.

Hair Loss: Can cause hair loss and skin lesions.

Impaired Taste and Smell: Deficiency can lead to a loss of these senses.

Recommended Dietary Allowances (RDAs) for Zinc

Adult Men

11 mg/day

Adult Women

8 mg/day.

Pregnant Women

11-13 mg/day.

Children

Varies by age, generally 2-11 mg/day.

Factors Affecting Zinc Absorption

Phytates: Found in grains and legumes, can bind zinc and inhibit its absorption.

Protein: High-protein diets can enhance zinc absorption.

Iron Supplements: High doses of iron can interfere with zinc absorption.

Example Exam Questions and Answers

1. Identify two primary food sources of zinc.

Red meat and whole grains are primary sources of zinc.

2. Describe one key function of zinc in the human body.

Zinc is crucial for the development and function of the immune system.

3. What is the effect of zinc deficiency on the human body?

Zinc deficiency can lead to weakened immunity, impaired wound healing, and growth retardation in children.