BIO 111 Lecture Notes - Lecture 21: Tunxis Community College, Phytic Acid, Yogurt
6 Jan 2021
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Mineral processing: minor amounts absorbed in stomach, majority absorbed in small and large intestine, various mechanisms - facilitated (pumped, not diffused), and carrier-mediated, less bioavailable from plant sources -- may be absorbed better from animal sources get about. Foe example, plant sources of ca absorbability - algecal 75%, pear 67%, yogurt. Minerals have similar electric charges same size compete for absorption shouldn"t"t take one mineral in foods better: non-mineral compounds - phytic acid (phytate) and oxalic acid (oxalate) in plants bind minerals, individuals, age, gender, genetics. Calcium: blood calcium levels, ph & mg compete, sensitive to phytates/oxylates, vitamin d status, glucose and lactose. Iron: better in presence of vit c, sensitive to fiber. On average, net ca absorption = 0 if dietary ca is less than 200mg/d. Estimated minimum intake = 400 mg (200 to get net absorption greater than 0-200 to cover obligatory losses) Better in presence of vitamin c ascorbic acid sensitive to fiber.
