Component

Human macular pigment optical density

Human macular pigment optical density. Species, exposure and limitations are retained in each linked claim.

3 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. Attention and reasoning improvements were observed in analyses requiring significant macular-pigment increases.

    Human macular pigment optical density → Complex attention and reasoning scores in young adults source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/lutein-research/29135938.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "f60146e188d1a3093c572c3f637ebd659184f72727a75b35afd265b5ef0be71b", "start_char": 21132, "end_char": 25480, "text_sha256": "02d9398a25880c0ead3b3ef0ed91d12a98f837a8c8f89c141986dd926e1010a8"}
    experimental_model
    Small randomized double-masked placebo-controlled trial with biomarker-response analyses
    exposure
    Lutein 10 mg + zeaxanthin 2 mg daily for one year
    limitations
    Small unequal groups and multiple outcomes; attention/reasoning findings depended on pigment-response analysis. MPOD does not directly measure brain tissue.
    nutrient_topic
    Lutein research collection; topical membership is not evidence of a direct dietary effect. · Lutein
    organism
    51 analyzable healthy adults aged 18–30; 37 active and 14 placebo
    plain_language
    These findings depended on a biomarker-response subgroup.
    primary_references
    [lutein-p29135938] Effects of a Lutein and Zeaxanthin Intervention on Cognitive Function: A Randomized, Double-Masked, Placebo-Controlled Trial of Younger Healthy Adults. (2017). https://pubmed.ncbi.nlm.nih.gov/29135938/ DOI: 10.3390/nu9111246
    tissue_or_cell_type
    Cognitive testing and retinal pigment measurement

    Lutein: metabolism, signaling and nutrient connections (2026-09-17) · lines 918–929

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Small randomized double-masked placebo-controlled trial with biomarker-response analyses · source_derived_draft · unverified_draft

    ### lutein-young-response-dependent Attention and reasoning improvements were observed in analyses requiring significant macular-pigment increases. Condition category: normal nutrient_topic: Lutein research collection; topical membership is not evidence of a direct dietary effect. plain_language: These findings depended on a biomarker-response subgroup. organism: 51 analyzable healthy adults aged 18–30; 37 active and 14 placebo tissue_or_cell_type: Cognitive testing and retinal pigment measurement experimental_model: Small randomized double-masked placebo-controlled trial with biomarker-response analyses limitations: Small unequal groups and multiple outcomes; attention/reasoning findings depended on pigment-response analysis. MPOD does not directly measure brain tissue. exposure: Lutein 10 mg + zeaxanthin 2 mg daily for one year evidence_span: {"source_cache": "artifacts/lutein-research/29135938.fulltext.txt", "locator": "Primary full-text span; zero-based, end-exclusive Unicode character offsets", "file_sha256": "f60146e188d1a3093c572c3f637ebd659184f72727a75b35afd265b5ef0be71b", "start_char": 21132, "end_char": 25480, "text_sha256": "02d9398a25880c0ead3b3ef0ed91d12a98f837a8c8f89c141986dd926e1010a8"} [lutein-p29135938] Effects of a Lutein and Zeaxanthin Intervention on Cognitive Function: A Randomized, Double-Masked, Placebo-Controlled Trial of Younger Healthy Adults. (2017). https://pubmed.ncbi.nlm.nih.gov/29135938/ DOI: 10.3390/nu9111246
    Complete structured claim and evidence

What acts on it

  1. L+Z increased macular pigment optical density versus placebo at all measured eccentricities.

    Lutein 10 mg plus zeaxanthin 2 mg daily combination → Human macular pigment optical density source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/lutein-research/25468896.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "01231d6577e7c30e79a74525772191092df003b42344095a53faf0279f138ac3", "start_char": 0, "end_char": 2007, "text_sha256": "01231d6577e7c30e79a74525772191092df003b42344095a53faf0279f138ac3"}
    experimental_model
    Randomized double-blind placebo-controlled visual-performance study
    exposure
    Lutein 10 mg + zeaxanthin 2 mg daily for one year
    limitations
    Combined intervention; improved task performance is not evidence of AMD prevention or treatment.
    nutrient_topic
    Lutein research collection; topical membership is not evidence of a direct dietary effect. · Lutein
    organism
    115 young healthy adults
    plain_language
    More pigment was measured in the macula.
    primary_references
    [lutein-p25468896] A double-blind, placebo-controlled study on the effects of lutein and zeaxanthin on photostress recovery, glare disability, and chromatic contrast. (2014). https://pubmed.ncbi.nlm.nih.gov/25468896/ DOI: 10.1167/iovs.14-15573
    tissue_or_cell_type
    Serum, macular pigment and visual tasks

    Lutein: metabolism, signaling and nutrient connections (2026-09-17) · lines 840–851

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Randomized double-blind placebo-controlled visual-performance study · source_derived_draft · unverified_draft

    ### lutein-mpod-increase L+Z increased macular pigment optical density versus placebo at all measured eccentricities. Condition category: normal nutrient_topic: Lutein research collection; topical membership is not evidence of a direct dietary effect. plain_language: More pigment was measured in the macula. organism: 115 young healthy adults tissue_or_cell_type: Serum, macular pigment and visual tasks experimental_model: Randomized double-blind placebo-controlled visual-performance study limitations: Combined intervention; improved task performance is not evidence of AMD prevention or treatment. exposure: Lutein 10 mg + zeaxanthin 2 mg daily for one year evidence_span: {"source_cache": "artifacts/lutein-research/25468896.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "01231d6577e7c30e79a74525772191092df003b42344095a53faf0279f138ac3", "start_char": 0, "end_char": 2007, "text_sha256": "01231d6577e7c30e79a74525772191092df003b42344095a53faf0279f138ac3"} [lutein-p25468896] A double-blind, placebo-controlled study on the effects of lutein and zeaxanthin on photostress recovery, glare disability, and chromatic contrast. (2014). https://pubmed.ncbi.nlm.nih.gov/25468896/ DOI: 10.1167/iovs.14-15573
    Complete structured claim and evidence

  2. MPOD rose across the three active arms, with no significant between-group difference (P=0.47).

    ZVF trial zeaxanthin, lutein and combined active arms → Human macular pigment optical density source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/zeaxanthin-research/22027699.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "849b03f2bf0734e12b654e662e0a15e5f347415de7b0bbabe2cdc0d7bad85e3e", "start_char": 0, "end_char": 3131, "text_sha256": "849b03f2bf0734e12b654e662e0a15e5f347415de7b0bbabe2cdc0d7bad85e3e"}
    experimental_model
    Small randomized active-comparator ZVF trial
    exposure
    One year; 8 mg zeaxanthin, 8 mg zeaxanthin plus 9 mg lutein, or 9 mg lutein comparator
    limitations
    The so-called faux placebo was active lutein. Small unequal arms, multiple outcomes and borderline tests limit claims of superiority; proposed competition was not directly tested.
    nutrient_topic
    Zeaxanthin research collection; topical membership is not evidence of a direct dietary effect. · Dietary (3R,3-prime-R)-zeaxanthin
    organism
    60 patients with mild-to-moderate AMD; 57 men
    plain_language
    The study did not establish one arm as superior for pigment density.
    primary_references
    [zeaxanthin-p22027699] Randomized, double-blind, placebo-controlled study of zeaxanthin and visual function in patients with atrophic age-related macular degeneration: the Zeaxanthin and Visual Function Study (ZVF) FDA IND #78, 973. (2011). https://pubmed.ncbi.nlm.nih.gov/22027699/ DOI: 10.1016/j.optm.2011.08.008
    tissue_or_cell_type
    Macular pigment and visual tasks

    Zeaxanthin: metabolism, signaling and nutrient connections (2026-09-17) · lines 977–988

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Small randomized active-comparator ZVF trial · source_derived_draft · unverified_draft

    ### zeaxanthin-zvf-mpod-null MPOD rose across the three active arms, with no significant between-group difference (P=0.47). Condition category: normal nutrient_topic: Zeaxanthin research collection; topical membership is not evidence of a direct dietary effect. plain_language: The study did not establish one arm as superior for pigment density. organism: 60 patients with mild-to-moderate AMD; 57 men tissue_or_cell_type: Macular pigment and visual tasks experimental_model: Small randomized active-comparator ZVF trial limitations: The so-called faux placebo was active lutein. Small unequal arms, multiple outcomes and borderline tests limit claims of superiority; proposed competition was not directly tested. exposure: One year; 8 mg zeaxanthin, 8 mg zeaxanthin plus 9 mg lutein, or 9 mg lutein comparator evidence_span: {"source_cache": "artifacts/zeaxanthin-research/22027699.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "849b03f2bf0734e12b654e662e0a15e5f347415de7b0bbabe2cdc0d7bad85e3e", "start_char": 0, "end_char": 3131, "text_sha256": "849b03f2bf0734e12b654e662e0a15e5f347415de7b0bbabe2cdc0d7bad85e3e"} [zeaxanthin-p22027699] Randomized, double-blind, placebo-controlled study of zeaxanthin and visual function in patients with atrophic age-related macular degeneration: the Zeaxanthin and Visual Function Study (ZVF) FDA IND #78, 973. (2011). https://pubmed.ncbi.nlm.nih.gov/22027699/ DOI: 10.1016/j.optm.2011.08.008
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

    Evidence, AI assistance and curation standards