Diet Types

Diet types: compare 10 approaches

Compare Mediterranean, keto, intermittent fasting and other diet types. Explore food choices, differences and considerations with sourced practical guides.

Key differences between diet types

Diet types answer different questions: some organize food choices, others meal times, and others a medical requirement. A diet’s name alone does not establish whether it is suitable for you.

This selection explains commonly encountered diet search topics. It is neither a verified top ten by search volume nor a ranking of health benefits.

Each name links to a detailed guide. On smaller screens, scroll the table sideways.

10 diet types: focus and questions to consider
Diet type	Main approach	Consideration
Mediterranean diet	Plant-focused foods, olive oil and flexible meals	No fixed exclusion list or requirement to drink alcohol.
Intermittent fasting	Timing of eating rather than a food list	Medicines and personal health come before timing rules.
Ketogenic diet	Very low carbohydrate and a high fat share	Assess fibre, fat quality and medical suitability.
Low-carb diet	Reducing carbohydrate-containing foods	Consider which fats and proteins replace them.
Vegan diet	Excluding all animal foods	Plan reliable B12 and other nutrient sources.
Vegetarian diet	No meat or fish; eggs or dairy depend on the type	Using only cheese as a replacement can limit variety.
DASH diet	Food choices and sodium with a blood-pressure focus	Coordinate with personal treatment and potassium advice.
Paleo diet	Usually excludes grains, pulses and dairy	Consider the fibre and calcium sources removed.
Gluten-free diet	Excludes gluten in wheat, barley and rye	Discuss celiac testing before removing gluten.
Dukan diet	A commercial, protein-focused method with phases	Review restrictive lists for variety and personal suitability.

A sourced guide to each diet type

Mediterranean diet

A Mediterranean diet emphasizes vegetables, fruit, pulses, whole grains and olive oil. It describes a pattern of eating rather than one country’s fixed menu. You can adapt its principles to familiar foods, your budget and the meals you already cook.

Further readingAmerican Heart Association — Mediterranean diet

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Intermittent fasting

Intermittent fasting is an umbrella term for patterns that alternate eating and fasting periods. It does not determine food quality on its own. In 16:8, meals fall within eight hours, with sixteen hours without food; this definition is not a recommendation to follow it.

Further readingNIH — To Fast or Not to Fast

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Ketogenic diet

A ketogenic diet severely limits carbohydrate and increases the share of energy supplied by fat. It is more restrictive than simply eating less carbohydrate. An online keto menu cannot establish whether this approach is appropriate for your health or nutritional needs.

Further readingHEART UK — Low carbohydrate and ketogenic diets

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Low-carb diet

A low-carb diet reduces carbohydrate-containing foods, but there is no single universal menu. It does not always mean keto. Which foods are reduced, and what takes their place, matters when evaluating the overall pattern.

Further readingHEART UK — Low carbohydrate and ketogenic diets

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Vegan diet

A vegan diet excludes animal foods, including meat, fish, dairy and eggs. It needs more planning than simply removing meat from a plate. A vegan label alone does not establish that a product or an entire diet is nutritionally balanced.

Vegetarian diet

A vegetarian diet excludes meat and fish; depending on the type, it may include eggs or dairy. Lacto-ovo vegetarian eating includes both. Vegan eating excludes these foods too. Describing your actual preferences makes shopping and restaurant conversations more straightforward.

Further readingNHS — The vegetarian diet

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DASH diet

DASH stands for Dietary Approaches to Stop Hypertension, an eating pattern studied for blood-pressure management. It includes vegetables, fruit, whole grains, pulses and foods such as lower-fat dairy. It supports food choices rather than replacing prescribed treatment.

Further readingNHLBI — DASH eating plan

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Paleo diet

A paleo diet is a modern approach inspired by a claimed hunter-gatherer eating pattern. It usually includes meat, fish, eggs, vegetables, fruit and nuts, while excluding grains, pulses and dairy. It does not describe a single diet eaten by all prehistoric people.

Further readingBritish Heart Foundation — Paleo diet

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Gluten-free diet

A gluten-free diet excludes gluten found in wheat, barley and rye. It is medically necessary for celiac disease rather than a general weight-loss strategy. If you suspect celiac disease, discuss testing before removing gluten because dietary changes can affect results.

Further readingNIDDK — Eating, diet and nutrition for celiac disease

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Dukan diet

The Dukan diet is a commercial method that starts with restrictive, protein-focused food lists. It is usually described through attack, cruise, consolidation and stabilization phases. Popularity alone does not establish that it is appropriate or superior for everyone.

Further readingDukan Diet — Method FAQ (commercial source)

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What should you consider before choosing a diet?

Clarify your purpose: improving everyday routines and managing a medical condition require different support.
List familiar meals, your budget and working hours. Consider how a rule would fit an ordinary week.
Check what replaces excluded foods and note questions about variety and nutritional adequacy.
Discuss restrictive plans with your healthcare team if you have a condition, take medicines, are pregnant or breastfeeding, or have an eating-disorder history.

DietPro Chat provides educational nutrition coaching and lifestyle support from real people through an iOS app. Explaining diet types does not mean that we provide clinical treatment or a specialist programme for each one.

Frequently asked questions

What is the best diet?

There is no single best diet for everyone. Health needs, nutritional adequacy, preferences and practical sustainability need to be considered together; popularity is not a personal recommendation.

Do these guides provide a personal meal plan?

No. Meal examples explain the concepts. They do not prescribe individual calories, portions, supplements or medical diets.

Why do these diets serve different purposes?

Intermittent fasting focuses mainly on timing, vegan eating excludes animal foods, and gluten-free eating is medically necessary for celiac disease. A single weight-loss ranking would obscure these differences.