This book aims to inform the public about nutrition-related issues, based on scientific research. It highlights the negative shift in dietary habits, as the transition from the traditional Greek diet to a Western-style diet—rich in meat, processed foods, and sugar—has taken place. This change, combined with a decrease in physical activity due to modern lifestyles, has led to an increase in obesity, hypertension, and chronic diseases such as cardiovascular conditions, diabetes, and dementia, with a significant rise in related deaths.