A healthy diet may improve or maintain optimal health. In developed countries, affluence enables unconstrained caloric intake and possibly inappropriate food choices. It is recommended by many authorities that people maintain a normal weight by limiting consumption of energy-dense foods and sugary drinks, eat plant-based food, limit red and processed meat, and limit alcohol. However, there is no total consensus on what constitutes a healthy diet. Proper nutrition requires ingestion and absorption of vitamins, minerals, and food energy in the form of carbohydrates, proteins, and fats. Dietary habits and choices play a significant role in the quality of life, health and longevity. It can define cultures and play a role in religion.