Calcium Absorption: Milk vs Spinach — Full Breakdown & Transcript

Why Milk Calcium Is 10x Better Absorbed Than Spinach | Dr Connie Weaver

Published Oct 19, 2026 Transcribed Oct 19, 2026 Modern Healthspan Modern Healthspan
Beginner 1 min read For: Health-conscious individuals, nutrition students, and anyone interested in understanding food science and calcium bioavailability.
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"Delivers exactly what the title promises — a clear, science-backed explanation of calcium absorption differences."

AI Summary

This video features Dr. Connie Weaver explaining why calcium from milk is absorbed about 10 times better than calcium from spinach. The key reason is the presence of oxalic acid in spinach, which binds with calcium to form an insoluble salt that the human body cannot absorb.

[00:03]
Calcium Absorption from Milk

Calcium from a glass of milk or a cup of yogurt is absorbed at about 30% efficiency.

[00:18]
Spinach's High Calcium Content

Spinach is considered a high-calcium food, but its calcium is absorbed about 10 times worse than milk calcium.

[00:32]
Oxalic Acid's Role

Spinach contains oxalic acid, which binds with calcium to form an insoluble salt. Since the body cannot absorb this compound, the calcium is not bioavailable.

Mentioned in this Video

💡 Key Takeaways

📊

Milk Calcium Absorption Rate

Provides a concrete baseline (30%) for comparing calcium sources.

00:03
💡

Spinach Calcium Absorption Disadvantage

Highlights a common misconception about spinach being a great calcium source.

00:18
🔧

Oxalic Acid Mechanism

Explains the biochemical reason behind poor calcium absorption from spinach.

00:32

[00:03] человека из стакана молока или чашки йогурта составляет около 30%. Если дать кальция в молоке и шпинате, который является одним

[00:18] высоким содержанием кальция, потому что большинство усваивается в 10 раз лучше, чем из шпината. Что ж, в шпинате содержится щавелевая

[00:32] нерастворимую соль, а поскольку у нас нет absorb it. A striking difference.

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