Paleo diet: what it includes, what it promises and what the evidence says

Grains, legumes and dairy: what the paleo diet excludes

The most widely known version of the paleo diet is based on vegetables, fruit, nuts, eggs, fish and meat. It usually excludes grains, legumes and dairy. It also reduces added sugar and many ultra-processed products. There are different versions. Some allow tubers; others limit them. This variation already makes it difficult to speak of a single diet with its own results.

The usual rationale is evolutionary: foods introduced with agriculture would be too recent for our genes. It sounds intuitive, but the age of a food does not tell you whether it agrees with you or improves your health.

Some people tolerate dairy and others do not. The response depends on the person and the food, not on a historical label.

Was there a single way of eating in the Palaeolithic?

We do not know of a universal Palaeolithic menu. The availability of plants and animals varied by location, climate and season. An anthropological study found great diversity in the proportions of plant and animal foods among present-day hunter-gatherer groups [1]. This offers a clue to human diversity, although these groups today are not a snapshot of the Palaeolithic.

The history of milk shows another difficulty with the idea of an unchanging genetic makeup. A study of Europe found that the intensity of prehistoric milk use did not, by itself, explain the selection for the ability to digest lactose in adulthood [2]. Its authors suggest that famines and exposure to pathogens may also have played a role.

That study cannot determine what each person should eat today. It does challenge a single genetic explanation for accepting or rejecting dairy.

A food’s age does not determine whether it belongs on your plate.

What trials on the paleo diet have measured

Compared with other diets, a review found favourable differences in weight, blood pressure and some lipid levels, but concluded that the evidence does not support firm claims about cardiovascular risk factors [3]. It included few trials, with small samples and different comparators; the analysis used short follow-up periods, although some studies followed participants for longer [3].

Some of the result may come from eating fewer energy-dense products and more filling foods. The trials do not clearly distinguish this change from excluding legumes or grains. Therefore, improvement over a few weeks does not show that those food groups are the problem. Nor does it show that the effect lasts after follow-up ends.

If you want to lose fat and sustain the change, the guide to eating for weight loss explains how to build a complete diet. The comparison with the Sirtfood diet helps show why something new can seem appealing without changing what matters.

What the excluded food groups provide

Legumes provide fibre, plant protein and an affordable option for a main meal. Oats, bread and other whole grains also provide fibre. The World Health Organization recommends getting carbohydrates mainly from whole grains, vegetables, fruit and legumes [4]. Removing all of them limits variety without the paleo label demonstrating any additional benefit.

Removing dairy reduces a convenient source of calcium. You can get enough from other foods, but this means looking at your overall diet. Some plant-based drinks are fortified with calcium; check the label.

Tofu made with calcium salts and sardines with their bones can also provide this mineral [5]. Not all plant-based alternatives provide the same amount of protein or calcium.

If you do not tolerate lactose, you do not need to eliminate the whole food group as a rule. You can consider lactose-free dairy products or suitable alternatives with a dietitian. Nor should you assume that giving up gluten helps with weight loss. Coeliac disease requires a medical diagnosis and a tailored diet.

Nuts and olive oil are useful, but they cannot by themselves make up for a shopping basket with little variety. The aim is to have enough options for your schedule, budget and appetite. A diet that eliminates three food groups can leave you with few possible meals, even if it seems easy on the first day.

Minimally processed foods without excluding food groups

In a controlled trial, people consumed more energy with an ultra-processed menu than with a menu of minimally processed foods [6]. The trial did not test the paleo diet or attribute that result to excluding legumes, grains or dairy. If you want to reduce certain ultra-processed foods, you can do so while keeping lentils, wholemeal bread or yoghurt.

Vegetables and fruit also deserve a place. You can start by adding them to dishes you already make: tomato in a sandwich, fruit at breakfast or frozen vegetables in rice. Keeping grains and legumes means you can cook with fewer rules. The guide to the Mediterranean dietary pattern explains this combination without requiring every food to be perfect.

Who should consider avoiding such a restrictive diet?

If you have had an eating disorder, rigid rules can take up too much mental space . If you notice fear of going off the list or a need to compensate, seek specialist help before starting another diet. Clinical guidance on eating disorders prioritises recognising and treating these patterns [7].

If you train for many hours, removing grains and legumes may make it harder to meet your energy and carbohydrate needs . The sports consensus links low energy availability with health and performance problems [8]. This does not mean every athlete needs the same amount. It is advisable to adjust meals to the training load.

During pregnancy, a diet that eliminates entire food groups calls for particular caution . Pregnancy nutrition recommendations include whole-grain options and calcium-rich foods [9]. If you are pregnant or trying to become pregnant, seek advice before restricting your diet. Nutrient and food-safety reviews should be individualised.

What questions do we hear in consultations?

We often see one misunderstanding in consultations: thinking that “no grains” means “no packaged products”. Wholemeal bread and a packaged sweet serve different purposes. Another idea that comes up is that any improvement at the start confirms the genetic explanation. It could be due to many simultaneous changes, including eating more regularly.

Another question is what to do when sharing a meal. If a lentil dish or yoghurt feels manageable and agrees with you, you do not need an ancestral justification to keep it. The guide to assessing food claims helps review rigid rules without ridiculing anyone who has tried them.

A day of meals with useful foods and no exclusions

One possible day starts with plain yoghurt, oats and fruit. If you prefer savoury food, you could have wholemeal bread with tomato and egg. Both breakfasts fit into a simple shopping list. They do not require special products or calculating every bite.

For lunch, make lentils with vegetables and olive oil, or a chickpea salad with tomato, cucumber and tuna. Add more according to your hunger. You can have a piece of fruit afterwards or between meals, if you like. For dinner, have fish with potato and oven-roasted vegetables; another option is an omelette with salad and bread.

This example includes vegetables, fruit and minimally processed foods. At the same time, it leaves room for legumes, whole grains and dairy. It is not a meal plan calculated for an illness, pregnancy or intense training. If you need to adapt quantities or avoid a food because of a diagnosis, we can assess that with you.