Which one among the following statements about a healthy diet is correct?

A healthy diet is defined by the balanced intake of essential nutrients. An optimal quantity of macronutrients—carbohydrates, proteins, and fats—is necessary as they provide the primary energy and structural foundations for the body [3]. Carbohydrates serve as the main energy source, while proteins support growth and cellular repair [3]. Additionally, adequate water and fibre are critical; water supports nutrient transport and metabolism, while fibre is essential for digestive health and preventing chronic diseases [4]. Conversely, high-energy snacks are often nutrient-poor and linked to obesity if they are energy-dense but lack vitamins [2]. While fruits and vegetables are vital, they are generally valued for being nutrient-dense rather than having high energy (calorie) content [4]. A balanced diet must include all these components in appropriate proportions rather than excluding carbohydrates or fibre [3].

Sources

1. [3] https://www.ncbi.nlm.nih.gov/books/NBK554545/
2. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 9: Life Processes in Animals > FASCINATING FACTS > p. 127
3. [2] https://pmc.ncbi.nlm.nih.gov/articles/PMC5015032/
4. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 6: Adolescence: A Stage of Growth and Change > 6.4.1 Meeting nutritional needs > p. 79