KenDBerryMD - Iron Deficiency Anemia (Avoid This!)

Short Summary

Main recommendation: If you have iron deficiency anemia or want to prevent it, avoid tannin-containing foods and drinks during, right before, and right after iron-rich meals, since tannins bind iron and block its absorption. Dr. Berry recommends red meat and liver as the most bioabsorbable iron sources, noting that tannins affect plant (non-heme) iron much more strongly, though they also reduce heme iron absorption somewhat.

Key Points

• According to Dr. Berry, heme iron from meat (such as red meat and liver) is much more bioabsorbable than non-heme iron from plants, making it his preferred source for correcting iron deficiency anemia faster.
• Tannins are polyphenols in many plant foods and drinks that bind iron and prevent absorption; they affect non-heme iron far more than heme iron.
• Dr. Berry argues tannin-containing items are not healthy in this context, even though polyphenols are often promoted as healthy, because they can prevent correcting iron deficiency anemia.
• Plant-based diets, including vegan or vegetarian keto, are especially challenging for iron intake because many high-tannin plant foods can block the non-heme iron they provide.
• Dr. Berry says persistent iron deficiency despite iron-rich eating may be explained by high dietary tannin intake, but only after other causes such as bleeding, early red blood cell destruction, or bone marrow problems have been ruled out with a doctor.

Details Worth Noting

• Concrete instructions: Avoid all coffee, all tea (black, brown, white, and herbal), and all wine during, right before, or right after an iron-rich meal.
• Concrete instructions: Avoid beer as much as possible, since most beers contain some tannin; avoid grape, apple, cranberry, and berry juices, which contain skin-derived tannins. Citrus juices are described as tannin-free because the peel is not included.
• Concrete instructions: Avoid dark chocolate and real cocoa with the meal, even as a dessert afterward.
• Concrete instructions: Avoid fruits and berries with skins, including apples, persimmons, and bananas (eating the peel and unripe fruit is highest in tannins), and avoid including fruit or berries in a meal from which you want to absorb a lot of iron. Berries become less tannic as they ripen but do not reach zero.
• Concrete instructions: Avoid most nuts when unsoaked, unsprouted, and still skinned, plus all beans, legumes, and lentils (tannins are concentrated in their skins), and avoid rye, barley, and sorghum.
• Concrete instructions: Avoid cinnamon, thyme, clove, and vanilla in iron-rich meals, as these spices are named as high in tannins.
• Caveat: The video is only about dietary causes; talk to a doctor and complete any workup for other causes of iron deficiency anemia first. Dr. Berry presents this as his view and points to research in the show notes, and this is not professional medical advice.

Bottom Line

Iron deficiency anemia that persists despite iron-rich eating may be driven by tannins blocking absorption, so timing matters: keep tannin-rich foods and drinks away from iron-rich meals, and get medical evaluation for other causes first.