When it comes to healthy eating, opinions could not be more diverse and contradictory. A miriad of diets and eating patterns are presented to consumers as being “the healthiest” or “the most effective for weight control” by their advocates. However, be cautious—not all of them have the necessary scientific support to validate these claims.

Here are three essential principles, supported by nutritional science, that the healthiest “diets” have in common (in the current context, the term “diet” refers to an eating pattern—such as the Mediterranean diet—rather than a restrictive meal plan limited to certain food types or calorie counts).

1. Plant-based foods constitute the foundation of the diet

They cover the whole spectrum of vegetables, fruits, legumes (beans, lentils, chickpeas, peas), whole grains, nuts, and seeds – the larger the variety, the better. Plants provide an excellent source of protein, slow-releasing carbohydrates (which help stabilize blood sugar levels), and healthy fats. They are also rich in fiber, which nourishes the gut microbiome, as well as vitamins, minerals, and a unique category of nutrients found exclusively in plants, with anti-inflammatory, antioxidant, and even anti-cancer properties. In addition to their high nutrient content that supports overall health, plant-based foods are also lower in calories compared to animal products, contributing to sustainable body weight management.

2. High-quality proteins and fats

They should come from sources such as legumes (protein), nuts, seeds, eggs, fish (both protein and healthy fats), and olive oil (fats). Consumption of red meat (beef, pork) and processed meat (such as cold cuts) should be limited or even avoided.

3. Whole or minimally processed foods

Whole foods are those consumed in their natural state, such as fresh or frozen fruits and vegetables, eaten as raw (when possible) or cooked. Minimally processed foods include options like yogurt or canned fish. Processing not only removes nutrients but also often adds harmful fats, large amounts of sugar, sodium, food additives, and preservatives, which, over time, may negatively impact health. In fact, studies show that a diet high in ultra-processed foods leads to weight gain, increased blood sugar and cholesterol levels, accelerated aging, and inflammation—this last factor being considered a root cause of most chronic diseases.

To maximize the benefits of a healthy diet, it should be considered within a broader context of a varied and balanced nutrition plan that provides the body with all the essential nutrients it needs. Additionally, it should be part of an overall healthy lifestyle, as recognized by lifestyle medicine—a lifestyle that, in addition to proper nutrition, prioritizes physical activity, sleep, stress management, meaningful relationships, and avoiding unhealthy habits (such as excessive alcohol consumption or smoking).

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Dr. Viorica Ivan is a certified Holistic Health and Nutrition Coach, focusing on Nutrition & Mental Well-being for Female Leaders and organizations; she is also a scientist, earning a doctorate (PhD) degree in Cell Biology from Utrecht University, The Netherlands.

Driven by the desire to make current scientific information about the importance of nutrition for health accessible to the public, Dr. Ivan founded Smart Science Holistic Health, a coaching business and health education platform. Through a tailored approach that combines cutting-edge nutrition strategies, stress management techniques, and life coaching tools, she helps transform the health of her clients from the inside out.

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