Food Diversity Score Calculator

Enter the number of unique whole foods you ate across each food group this week to calculate your diversity score and see how close you are to the 30-plant gut-health target.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Total Unique Foods
Input the total number of distinct whole foods you've consumed this week across all food groups.
2
Specify Fruit Varieties
Enter the count of different fruit types eaten this week (e.g., apple, banana, blueberries = 3).
3
Specify Vegetable Varieties
Enter the count of different vegetable types eaten this week (e.g., broccoli, spinach, carrots = 3).
4
Specify Legume Varieties
Enter the count of different legume types (beans, lentils, chickpeas, peas) consumed this week.
5
Specify Whole Grain Varieties
Enter the count of distinct whole grains (e.g., oats, brown rice, quinoa) eaten this week.
6
Specify Nuts & Seed Varieties
Enter the count of distinct nuts and seeds (e.g., almonds, walnuts, chia) consumed this week.
7
Specify Non-Plant Protein Varieties
Enter the count of distinct non-plant proteins (e.g., eggs, fish, poultry, meat) consumed this week.
8
Review Diversity Score
The calculator will provide your diversity score, rating, progress to target, and a breakdown of plant-food share.

Example Calculation

An individual tracks their diet for a week and counts 20 unique foods: 4 fruit, 6 vegetable, 2 legume, 3 whole grain, 2 nut, and 3 non-plant protein varieties.

Total Unique Foods This Week

Fruit Varieties

Vegetable Varieties

Legume Varieties

Whole Grain Varieties

Nuts & Seed Varieties

Protein Varieties (non-plant)

Results

20 / 30

Tips

Focus on Whole, Unprocessed Foods

When counting, prioritize whole, unprocessed foods. Different preparations of the same food (e.g., roasted broccoli vs. steamed broccoli) count as one variety, but different types (e.g., broccoli vs. cauliflower) count as distinct.

Explore New Produce

To increase your diversity score, make an effort to try new fruits, vegetables, legumes, and grains each week. Visit local farmer's markets for seasonal variety.

Herbs and Spices Count

Don't forget to include herbs and spices in your unique food count! While small in quantity, they are plant-based and contribute to gut microbiome diversity.

Boosting Your Health with the Food Diversity Score Calculator

The Food Diversity Score Calculator helps individuals assess the variety of whole foods in their weekly diet, benchmarking against the widely recognized "30 plants per week" target for optimal gut health.

By tallying unique fruits, vegetables, legumes, grains, and nuts, this tool provides a clear snapshot of dietary breadth.

For someone consuming 20 unique foods in a week, the calculator indicates a score of 20/30, highlighting areas for improvement to enhance overall well-being and microbiome health in 2025.

The Critical Role of Dietary Diversity for Well-being

Dietary diversity is far more than just "eating your greens"; it's a cornerstone of holistic health, directly impacting gut microbiome richness, immune function, and nutrient intake.

A varied diet ensures a broader spectrum of vitamins, minerals, fiber, and phytonutrients, which are essential for preventing deficiencies and supporting various bodily systems.

Emerging research in 2025 increasingly links a diverse plant-rich diet to reduced risk of chronic diseases, better metabolic health, and even improved mood and cognitive function.

The Logic of the 30-Foods-Per-Week Benchmark

The Food Diversity Score Calculator operates by tallying your reported unique whole foods across various categories and then comparing this total against the benchmark of 30 unique plant foods per week.

This benchmark, derived from research like the American Gut Project, suggests that higher dietary diversity, particularly from plant sources, correlates with a more robust and diverse gut microbiome.

The key calculations are:

Plant Foods = Fruit Varieties + Vegetable Varieties + Legume Varieties + Whole Grain Varieties + Nuts & Seed Varieties
Diversity Score = Total Unique Foods This Week
Foods to Target = Max(0, 30 - Diversity Score)
Plant-Food Share = (Plant Foods / Total Unique Foods This Week) × 100

This framework helps identify areas for increasing dietary breadth.

💡 Understanding the nutritional components of your food is key to a diverse diet. Our Calorie Reduction From Substitutions Calculator can help you make informed choices about nutrient density.

Worked Example: Evaluating a Week's Food Intake

Let's assess a week's food intake for an individual who recorded the following:

Total Unique Foods This Week: 20
Fruit Varieties: 4
Vegetable Varieties: 6
Legume Varieties: 2
Whole Grain Varieties: 3
Nuts & Seed Varieties: 2
Non-Plant Protein Varieties: 3

Here’s the diversity breakdown:

Calculate Plant Foods: Plant Foods = 4 (F) + 6 (V) + 2 (L) + 3 (G) + 2 (N) = 17
Diversity Score: Diversity Score = 20 / 30
Foods to Target: Foods to Target = Max(0, 30 - 20) = 10 foods needed
Plant-Food Share: Plant-Food Share = (17 / 20) × 100 = 85.0%

This individual has a Diversity Score of 20/30, indicating they need to add 10 more unique foods to reach the target, with an 85.0% plant-food share.

💡 For long-term food preservation and planning, similar attention to detail is required. The Canning Jar Quantity Estimator helps ensure you have enough supplies for your harvest.

The "30 Plants a Week" Gut Health Target

The "30 plants a week" guideline has gained significant traction in nutrition science, particularly through the work of the American Gut Project and prominent gut health experts like Dr. Tim Spector.

This benchmark emphasizes the importance of consuming a wide array of plant-based foods, including fruits, vegetables, whole grains, legumes, nuts, and seeds, rather than just focusing on total fiber intake.

Each different plant type brings a unique combination of fibers, prebiotics, and polyphenols, which in turn feed distinct strains of beneficial gut bacteria.

This variety fosters a robust and resilient microbiome, linked to improved digestive health, stronger immunity, and even better mental well-being.

Expert Interpretation of Food Diversity Scores

Nutritionists and dietitians interpret food diversity scores as a powerful, yet simple, indicator of overall dietary quality and gut health.

A score consistently below 20 unique plant foods per week often signals a need for significant dietary expansion, indicating a potential lack of essential micronutrients and limited support for a diverse gut microbiome.

Scores between 20-29 suggest good effort but highlight room for improvement, encouraging individuals to explore new varieties, especially within legumes, nuts, and seeds.

Achieving the 30+ benchmark is considered excellent, correlating with a robust and resilient gut ecosystem.

Professionals also look at the "Plant-Food Share" to ensure that the diversity is predominantly from whole, unprocessed plant sources, which are rich in fiber and phytonutrients essential for microbial health, differentiating from diets high in varied but processed foods in 2025.

Frequently Asked Questions

What is a good food diversity score for gut health?

A good food diversity score for optimal gut health, according to many nutrition experts, is to consume 30 or more different types of whole plant foods per week. This benchmark, popularized by the American Gut Project, is associated with a more diverse and resilient gut microbiome, which is beneficial for overall health.

Why is a diverse diet important for gut microbiome health?

A diverse diet is crucial for gut microbiome health because different plant foods contain various types of fiber and polyphenols that feed distinct beneficial gut bacteria. A wide range of nutrients supports a more robust and varied microbial community, linked to improved digestion, immunity, and even mental well-being.

Which food groups contribute most to dietary diversity?

Fruits, vegetables, legumes, whole grains, nuts, and seeds contribute most significantly to dietary diversity, especially for gut health. These plant-based food groups are rich in dietary fiber and phytonutrients that are fermented by gut bacteria, promoting a thriving and varied microbiome.