Build Your Optimal Diet

How to Analyse Your Diet: The Complete Guide

Most people have no idea whether their diet actually covers what their body needs. Calorie counting tells you how much you eat. Diet analysis tells you what you eat — and whether it lines up with what your body requires.

What is a diet analyser?

A diet analyser (also called a diet analysis tool, nutrition calculator, or dietary assessment tool) takes the foods you actually eat and measures them against science-backed nutrient targets. Unlike a simple calorie counter, a proper diet analyser evaluates your intake of vitamins, minerals, essential fatty acids, fibre, and macronutrients — all at once.

This tool analyses your diet against 24 essential nutrients using Dietary Reference Intakes (DRIs) published by the U.S. National Academies of Sciences. It then scores your overall diet quality against 21 published dietary patterns — including Mediterranean, DASH, MIND, Nordic, and the EAT-Lancet planetary health diet — and calculates your Dietary Inflammatory Index (DII), a validated marker of dietary inflammation linked to chronic disease risk.

Why analyse your diet instead of following a meal plan?

Meal plan generators are enormously popular. They promise to do the thinking for you: enter your goals, and out comes a week of meals. But this convenience comes at a cost that few people discuss.

When you outsource your dietary decisions to a generator, you learn nothing about why your diet works or doesn't. You don't develop an instinct for what your body needs. You fall into binary thinking — you're either following the plan perfectly, or you've "fallen off the wagon." There is no middle ground, no flexibility, no transferable skill.

Building and analysing your own diet is fundamentally different. It's a skill you develop once and keep for life. When you build a diet yourself — adding real foods, watching nutrient coverage update in real time, spotting gaps, and learning which foods fill them — you develop what nutritionists call dietary literacy. You start to understand that spinach is a magnesium powerhouse, that sardines cover B12, selenium, and omega-3 simultaneously, and that a single bell pepper delivers twice your daily vitamin C.

This knowledge doesn't expire. It transfers to every meal you eat for the rest of your life — whether you're cooking at home, eating out, travelling, or feeding your family. A meal plan gives you a fish. A diet analyser teaches you to fish.

How this diet builder works

The process is straightforward. You set your calorie and macronutrient targets (the tool calculates these from your age, sex, weight, height, and activity level using the Mifflin-St Jeor equation). Then you search for foods and add them to your meals — breakfast, lunch, dinner, snacks, or any custom meal you create.

As you build your diet, several things update in real time:

• Calorie and macro tracking — a visual gauge showing your intake against your target, with protein, carb, and fat bars.
• Nutrient coverage grid — 24 colour-coded cells showing what percentage of each nutrient's RDA you've hit. Green means covered, red means gap, purple means you've exceeded the tolerable upper limit.
• Gap analysis — when nutrient gaps are detected, the tool suggests specific whole foods to fill them. It prioritises multi-gap heroes (foods that address several deficiencies at once) and deprioritises processed or fortified foods.
• Diet quality score — a 0–100 composite score based on macro balance, micronutrient coverage, diversity, fibre intake, omega-3 levels, and sodium moderation.
• Dietary pattern adherence — how well your diet aligns with 21 published research-grade dietary patterns, from Mediterranean to Okinawan.
• Inflammatory index — your Dietary Inflammatory Index score, calculated from the methodology of Shivappa et al. (2014), with meta-analysis associations for cardiovascular disease, cancer, and all-cause mortality.

Understanding your nutrient targets

The default targets in this tool come from Dietary Reference Intakes (DRIs), which include two key values for each nutrient: the Recommended Dietary Allowance (RDA), which is the daily intake sufficient for 97–98% of healthy individuals, and the Tolerable Upper Intake Level (UL), which is the maximum daily intake unlikely to cause adverse effects.

An important nuance: the UL for some nutrients applies differently to food vs. supplements. For example, the 350 mg magnesium UL set by the Institute of Medicine (1997) applies only to supplemental magnesium (from pills, powders, and fortified products) — not to magnesium from whole foods like spinach, almonds, or dark chocolate. If this tool flags a magnesium excess and all your sources are whole foods, there is no safety concern. We've built this distinction into the tool's alert system.

Similarly, sodium is treated differently. Most diet trackers show sodium as a gap to fill, suggesting you eat more of it. This is misleading. While sodium has an Adequate Intake (AI) value (1,500 mg), virtually all diets exceed this without trying. Sodium is a nutrient where less is generally better above the AI, so this tool does not suggest sodium-rich foods in its gap analysis.

The 21 dietary patterns explained

One of the unique features of this diet analyser is scoring your diet against 21 published dietary patterns. These are not fad diets — they are research-defined eating patterns that have been studied in large cohort studies and clinical trials. Each pattern has specific food group targets derived from the scientific literature.

The Mediterranean diet emphasises olive oil, fish, legumes, nuts, whole grains, and vegetables, with moderate wine consumption. It is one of the most-studied dietary patterns, with consistent evidence for cardiovascular protection and reduced all-cause mortality. The DASH diet (Dietary Approaches to Stop Hypertension) was developed specifically to lower blood pressure through increased potassium, calcium, and magnesium intake while limiting sodium. The MIND diet combines elements of Mediterranean and DASH, specifically targeting brain health and cognitive decline prevention.

Other scored patterns include the Nordic diet (berries, root vegetables, fatty fish, whole grains), Okinawan diet (sweet potato-heavy, low calorie density), EAT-Lancet planetary health diet (environmentally sustainable eating), and more specialised patterns like the Anti-Inflammatory diet and Portfolio diet (designed for cholesterol reduction).

Who is this tool for?

This diet analysis tool is designed for anyone who wants to understand what their diet actually contains — not just calories, but the full micronutrient picture. Common use cases include:

• People exploring new dietary patterns — switching to vegetarian, vegan, or Mediterranean eating and wanting to check for nutrient gaps before they become problems.
• Athletes and active individuals — ensuring protein, iron, calcium, and B12 targets are met alongside higher calorie demands.
• Parents planning family meals — checking whether the foods served actually cover children's nutrient needs.
• Students of nutrition — learning how different foods contribute to overall dietary quality through hands-on experimentation.
• People working with dietitians — using the tool to log intake and generate PDF reports for discussion with their healthcare provider.

The data behind the tool

Every number in this tool traces back to published, peer-reviewed data. The food composition database draws from three harmonised sources: USDA FoodData Central Foundation Foods (laboratory-analysed, highest quality), the Australian Food Composition Database (FSANZ AFCD, filling gaps for nutrients like vitamin K2, D2/D3, and carotenoid fractions), and USDA SR Legacy (broadest coverage fallback). Together, these databases cover 7,793 foods with up to 113 nutrients each.

Nutrient targets use DRIs from the U.S. National Academies. Dietary pattern scoring uses food group targets extracted from the original research publications. The Dietary Inflammatory Index calculation follows the validated methodology of Shivappa et al., with inflammatory effect scores and global mean intake parameters derived from their published dataset.

Why is this tool completely free?

We believe that understanding what you eat shouldn't be locked behind a paywall. This diet builder includes everything: 7-day meal planning, 24-nutrient tracking, gap analysis, diet quality scoring against 21 dietary patterns, Dietary Inflammatory Index, environmental impact assessment, shopping list generation, nutrient trend charts, radar visualisation, and a downloadable PDF report. No account required. No upsells. No subscription. Everything runs in your browser.

Most comparable tools charge $10–30/month for features we give away. We built this as a public resource because good nutrition data should be accessible to everyone — regardless of budget.