Human nutrition refers to the provision of essential nutrients necessary to support human life and health. The seven major classes of nutrients are: Carbohydrates, fats, fiber, minerals, proteins, vitamins, and water. The human diet must have all these nutrients & it varies based on following stages of life:
 

• Infancy

• Childhood

• Adolescence

• Adulthood

• Older Adulthood

 

Nutrition needs vary based on different parameters e.g. gender, age, as per individual needs. There is no one size fits all when it comes to nutrition strategy. Recommendation of portion sizes is taken into account based on individual preferences, culture, religious beliefs, traditions and metabolic goals.