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. 2023 Oct 13;15(20):4365. doi: 10.3390/nu15204365

Table 2.

Summary of alpha and beta diversity findings between cases and controls in PD and AD studies.

PD Studies AD Studies
Alpha Diversity (case vs. control)

  • No difference observed (16 studies)

  • Difference observed (8 studies)

  • -

    6 studies higher alpha diversity in cases

  • -

    2 studies lower alpha diversity in cases

  • No difference observed (8 studies)

  • Difference observed (6 studies)

  • -

    6 studies lower alpha diversity in cases
Beta Diversity (case vs. control)

  • No difference observed (4 studies)

  • Difference observed (20 studies)

  • No difference observed (5 studies)

  • Difference observed (11 studies)