dii-calculator 1.0.3

A Python implementation of the Dietary Inflammatory Index (DII) calculator for nutritional epidemiology research

DII Calculator

A Python implementation of the Dietary Inflammatory Index (DII) for nutritional epidemiology research.

The Dietary Inflammatory Index is a literature-derived, population-based index that assesses the inflammatory potential of an individual's diet. This package provides a validated implementation for calculating DII scores from nutrient intake data.

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Installation

pip install dii-calculator

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Quick Start

import pandas as pd
from dii import calculate_dii

# Load your nutrient intake data
nutrients = pd.read_csv("your_data.csv")

# Calculate DII scores
results = calculate_dii(nutrients)
print(results)

Output:

   DII_score
0      -1.23
1       0.45
2       2.87

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Interpretation

DII Score	Dietary Pattern
Negative (< 0)	Anti-inflammatory diet
Near zero	Neutral
Positive (> 0)	Pro-inflammatory diet

Scores typically range from -8 (maximally anti-inflammatory) to +8 (maximally pro-inflammatory).

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Features

Detailed Output

Get per-nutrient contributions to understand what's driving the score:

detailed = calculate_dii(nutrients, detailed=True)
print(detailed[["Fiber_contribution", "Saturated fat_contribution", "DII_score"]])

Visualization

from dii import plot_dii_distribution, plot_nutrient_contributions

plot_dii_distribution(results)
plot_nutrient_contributions(detailed)

Command Line

dii input.csv -o results.csv
dii input.csv --detailed
dii --nutrients  # List supported nutrients

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Input Format

Your DataFrame should have columns matching DII nutrient names. The package supports all 45 DII parameters:

participant_id,Fiber,Alcohol,Vitamin C,Saturated fat,Energy
1,18.8,13.98,118.2,28.6,2056
2,25.0,0.0,150.0,22.0,1800

Run dii --nutrients to see all supported nutrients and their units.

Note: Nutrients not in your data are automatically excluded from the calculation.

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Validation

Validated against 13,580 NHANES participants with perfect match to the dietaryindex R package.

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Citation

If you use this package in your research, please cite:

@software{clark2025dii,
  author = {Clark, Ted and Strath, Larissa},
  title = {dii-calculator: Dietary Inflammatory Index Calculator for Python},
  year = {2025},
  url = {https://github.com/strathlab-data/DII}
}

Also cite the original DII methodology:

Shivappa N, Steck SE, Hurley TG, Hussey JR, Hébert JR. Designing and developing a literature-derived, population-based dietary inflammatory index. Public Health Nutr. 2014;17(8):1689-1696.

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License

MIT License — see LICENSE for details.

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Authors

• Ted Clark — University of Florida
• Larissa Strath, PhD — University of Florida

Department of Health Outcomes and Biomedical Informatics