Healthy eating does not necessarily mean giving up sweets, your favourite dishes or constantly counting calories. Research shows that, when it comes to maintaining good health, what matters far more is a person’s regular eating habits, rather than a single food item they might have eaten for dinner. One practical approach is — the 80/20 rule, whereby the bulk of one’s diet consists of nutritious foods, whilst still leaving room for culinary pleasures. We’ll explore how this principle works, why strict restrictions don’t always help, and what simple changes can improve your daily diet.
What is the 80/20 rule in nutrition and how does it work?
The idea behind the 80/20 rule is quite simple: roughly 80% of your diet should consist of balanced, nutritious meals, whilst the remaining 20% leaves room for less nutritious but favourite foods.
This approach is supported by an American nutrition researcher, a professor at Stanford University Christopher Gardner, who has been studying the impact of diet on human health for over 30 years.
In his view, striving to eat perfectly every day can create unnecessary restrictions. A flexible diet, on the other hand, which takes into account one’s habits and lifestyle, is easier to maintain over the long term.
For example, if, over the course of a week, a person mainly eats home-cooked meals containing vegetables, grains, fish and other nutritious foods, the occasional pizza or dessert does not negate the overall benefits of such a diet.
At the same time The 80/20 rule is neither a medical standard nor a mathematical formula. There’s no need to count every bite of food or set aside 20% calories specifically for sweets. It’s primarily about flexibility and maintaining healthy habits on a regular basis.
Which foods should form the basis of a healthy diet?
Despite the huge number of popular diets, the basic principles of a balanced diet remain fairly consistent.
The World Health Organisation recommends eating a varied diet, ensuring an adequate intake of dietary fibre, and limiting excessive intake of salt, free sugars and saturated fats.
For most people over the age of 10, the recommended guideline is at least 400 grams of fruit and vegetables every day.
The following could form the basis of your daily menu:
- Fruit and vegetables. Cabbage, carrots, beetroot, tomatoes, apples, berries and seasonal greens.
- Wholemeal products. Oatmeal, buckwheat, brown rice, wholemeal bread.
- Legumes. Beans, lentils, peas and chickpeas as sources of plant-based protein and fibre.
- Sources of protein. Fish, eggs, poultry, fermented milk products and plant-based alternatives.
- Unsaturated fats. Olive oil and other vegetable oils, nuts and seeds.
You don’t necessarily have to completely change your usual diet to do this. It’s enough to gradually increase the proportion of vegetables, add pulses and opt for less refined grains more often.
Why you shouldn’t give up your favourite foods altogether
One of the common mistakes when switching to a healthier diet is categorising foods as either completely allowed or forbidden.
This approach can turn every meal into a test of willpower. People start to feel guilty about having a dessert or simply dining out at a restaurant.
In fact, it is more important to assess the diet as a whole.
Whilst most meals provide the body with the necessary nutrients, a small amount of sweet treats can still form part of a balanced diet.
However, this does not mean that regularly consuming large quantities of sugary drinks, salty snacks or fatty meat products can be offset by a single vegetable salad.
Flexibility should help to build lasting habits, rather than serving as an excuse for excessive consumption of foods high in sugar, salt and saturated fats.
Are ultra-processed foods really always unhealthy?
In recent years, increasing attention has been paid to ultra-processed foods. According to the NOVA classification, a considerable number of industrial food products fall into this category. However, the processing itself does not automatically make food unhealthy.
For example, frozen vegetables, plain oats, natural yoghurt and tinned beans are processed, but can still form part of a balanced diet.
It is important to take into account not only the production method, but also the composition of the specific product.
Sweet cereal flakes with a high added sugar content differ significantly from ordinary porridge, although both products are manufactured industrially.
Similarly, wholemeal bread should not be equated with sweet biscuits simply because it contains certain processing additives.
At the same time, research links high consumption of many ultra-processed foods to adverse health effects. It is therefore advisable to limit the proportion of such foods in the diet, particularly when they replace vegetables, fruit and other nutritious foods.
Do you have to become a vegetarian to eat healthily?
A plant-based diet has a number of proven benefits, but it is not necessary to completely give up animal products in order to improve your diet.
In 2023, researchers at Stanford University conducted an experiment involving 22 pairs of identical twins.
Over the course of eight weeks, one twin from each pair followed a healthy vegan diet, whilst the other followed a balanced diet including animal products.
The vegan group showed greater reductions in LDL cholesterol, fasting insulin levels and body weight. However, this was a small, short-term study, and its results do not mean that a vegan diet is necessary for everyone.
A practical approach is to make vegetables, grains and pulses the basis of your meals more often, complementing them with other foods according to your needs and preferences.
For example, instead of a large portion of meat with very few vegetables, you could cook buckwheat with vegetables and a small portion of chicken.
How to put together a healthy meal plan without complicated calculations
For everyday meals, you can follow the simple ‘plate’ principle.
Vegetables should make up about half of your plate, a quarter should be grains or other wholegrains, and another quarter should be a source of protein. This is a handy visual guide, rather than a one-size-fits-all ratio for everyone.
An example of a typical daily menu:
Breakfast: Oat porridge with apple and natural yoghurt, or an omelette with vegetables and wholemeal bread.
Lunch: buckwheat, stewed beans or chicken, and a cabbage and carrot salad.
Snack: a piece of fruit, natural yoghurt or a small portion of nuts.
Dinner: baked fish with potatoes and vegetables, or a vegetable stew with pulses.
A menu like this doesn’t require expensive ingredients and can easily be adapted to suit the season and your family’s budget.
Portion sizes and the range of foods should be tailored to a person’s age, physical activity and individual needs.
How to eat healthily without spending a lot of money
The widespread belief that healthy eating is necessarily expensive is often linked to adverts for specialised products.
However, most essential nutrients can be obtained from a normal diet.
For example, beans and peas provide the body with protein and dietary fibre, whilst cabbage and carrots can be readily available sources of vitamins for much of the year.
Frozen vegetables are also a practical option, especially in winter when prices for fresh produce rise.
Simply planning your shopping helps too. If you draw up a menu for a few days, it’s easier to use up the food you’ve already bought and reduce food waste.
There is no need to buy expensive berries, exotic seeds or special powdered mixes if your normal diet already provides your body with the necessary nutrients.
Five habits to start with
To improve nutrition, you don’t necessarily have to change everything at once.
You could start by adding vegetables to your lunch and dinner, swapping sweet drinks for water more often, and gradually increasing the amount of wholegrain foods you eat.
It’s also a good idea to keep simple ingredients at home for quick meals — grains, pulses, eggs, seasonal fruit and frozen vegetables.
Another good habit is to check the ingredients of ready-made meals, particularly the amount of added sugar, salt and saturated fats.
And finally, there’s no need to try to make up for a high-calorie dinner by starving yourself the next day. It’s far more important to return to your usual balanced diet.
For people with certain medical conditions, food allergies or specific medical needs, general recommendations may need to be adapted on an individual basis.
Healthy eating starts not with restrictions, but with habits
The greatest advantage of a flexible approach is that it does not require you to constantly search for the perfect products or follow complicated schemes.
A varied diet, plenty of fruit and vegetables, moderation in salt and sugar intake, and regular, nutritious meals form the practical basis of healthy eating.
The 80/20 rule can help make this process more comfortable, but it does not in itself guarantee improved health.
The key thing is not how perfectly a person eats on any given day, but what eating habits are repeated over months and years.
