PERMANOVA	Permutational Multivariate Analysis of Variance
HEI-2020	Healthy Eating Index-2020
16S rRNA	16S ribosomal Ribonucleic Acid
db-RDA	Distance-based Redundancy Analysis
PCoA	Principal Coordinates Analysis
R2	Coefficient of Determination
SES	Socioeconomic Status
FFQ	Food Frequency Questionnaire
FINUT	Ibero-American Nutrition Foundation
BEDCA	Spanish Food Composition Database
USDA	United States Department of Agriculture
IPAQ	International Physical Activity Questionnaire
MET	Metabolic Equivalent of Task
E.Z.N.A.	E.Z.N.A. stands for ‘Easy Nucleic Acid’, a brand of nucleic acid extraction kits
DNA	Deoxyribonucleic Acid
Bio-Tek, Inc	Bio-Tek Instruments, Inc. (a laboratory instrumentation company)
FastQC	Fast Quality Control (a tool for quality checking high throughput sequence data)
DADA2	Divisive Amplicon Denoising Algorithm 2
QIIME2	Quantitative Insights Into Microbial Ecology 2
ASVs	Amplicon Sequence Variants
VSEARCH	Vectorized Search (open-source tool for metagenomics)
SILVA	SILVA ribosomal RNA gene database project
MAFFT	Multiple Alignment using Fast Fourier Transform
PCR	Polymerase Chain Reaction
IDT	Integrated DNA Technologies
Qiagen	Qiagen (biotech company for DNA/RNA extraction and analysis kits)
RT-PCR	Reverse Transcription Polymerase Chain Reaction
RNase	Ribonuclease
DNase	Deoxyribonuclease
CEI-FAMEN	Comité de Ética en Investigación de la Facultad de Medicina y Nutrición (ESP)
envfit	Environmental Fitting Function (in R vegan package 2.6-10)
CAP1	Canonical Axis 1 (used in constrained ordination analyses)
MDS1	Multidimensional Scaling Dimension 1
F	F-statistic
p	p-value
Df	Degrees of Freedom
SCFAs	Short-Chain Fatty Acids
ST1	Subtype 1 (Blastocystis subtype)
ST4	Subtype 4 (Blastocystis subtype)
ST7	Subtype 7 (Blastocystis subtype)