It's not complicated to eat balanced, 
A little bit of everything every day
Let's start with an ultra simple summary, for those who would not have the desire or the courage to go into details. 

THE THEORY 
To achieve a balanced diet , traditional dietetics recommends eating every day: 
- Fruits and vegetables , at least 500 g, in any form (fresh, unsweetened compote, cooked, fresh juice and homemade soup ...). 
The more you go, the more you recommend getting your feet up on the fruit because of the sugar they contain, and the emphasis on vegetables, raw or cooked. 
- At least 1 dairy product (cheese, milk, yoghurt ...), and although more and more specialists have a controversy about cow's milk, this should not prevent you from varying the original milks to vary also the pleasures and tastes. 
- A significant source of protein (meat, eggs, fish or vegetable proteins such as soya and some legumes ...). 
The old belief of not abusing eggs has had its day, and now, we can eat up to 6 times a week without fear, and preferably bio to benefit from their nutritional contributions. 
- 1 to 2 "portions" (ie soup, hazelnut ...) of fat . 
On this point, modern dietetics is undermining beliefs firmly rooted in people's minds: stop condemning fat, and pay more attention to sugar. The body needs fat, good fat (organic olive oils, rapeseed, nuts, coconut oil, butter ...). 
- 3 servings of starchy foods and / or wholemeal bread. 
For your information, we are no longer talking about starchy foods but about carbohydrates . Clearly, consume legumes (lentils, beans, chickpeas), sweet potatoes, root vegetables, whole pasta or basmati rice .... Potatoes should be consumed in moderation because of their glycemic index .

The ideal meal? 
You already know it, it's almost certain! Make a plate divided into three parts: 1 raw and / or cooked vegetable, 1 source of protein (meat, fish, egg, tofu, cheese ...), 1 serving of starchy foods and / or bread. 
You can add 1 cooked or raw fruit.

The current trend
More and more studies are showing the insidious misdeeds of sugar and any form of carbohydrate consumed in excess of the body. 
It is therefore important to pay attention to your carbohydrate intake. Know that fruits contain sugar, that the morning cereals are stuffed (even when they are complete), and that the most important for the balanced diet are vegetables for their fiber and vitamins. 
The food association is also important. Thus, you can lower the glycemic index of a food if you do not eat it alone. 
Ex: a rice cake ok, but then with a piece of avocado to bring down the extremely high GI.

Sounds monotonous to you? Complicated ? In fact, not at all, because to fill up with vitamins and minerals , it is important to vary the food. 
For example, the following two meals are perfectly balanced and are not alike! 
Meal idea 1: vegetable soup, chicken curry basmati rice, yogurt, pear 
Meal Idea 2: Cherry Tomatoes, Avocado-Tuna-Cheese Sandwich, Homemade Applesauce

Transformed products, run away!
Ready-made meals, industrial cereals and other ready-to-eat preparations are poor in micronutrients, but rich in hydrogenated fats, additives, salt and hidden sugars. 
Also, avoid them as much as possible, because most of the time, they bring empty calories, and bad nutrients, useless in terms of a balanced diet.