Option 1: Protein

Protein is an essential nutrient for the body and plays a role in various functions such as building and repairing tissues, producing enzymes and hormones, and supporting the immune system. While it is a crucial component of a balanced diet, it is not considered a rich source of energy. Protein provides 4 calories per gram, which is the same as carbohydrates but less than lipids.

Option 2: Lipid (correct answer)

Lipids, commonly known as fats, are a concentrated source of energy in the diet. They provide 9 calories per gram, which is more than twice the amount provided by proteins and carbohydrates. Lipids are essential for the absorption of fat-soluble vitamins, insulation and protection of organs, and the formation of cell membranes.

Option 3: Carbohydrate

Carbohydrates are another vital energy source for the body. They are the body`s primary source of fuel and are often found in foods such as grains, fruits, and vegetables. Carbohydrates provide 4 calories per gram, making them a relatively good source of energy but not as calorie-dense as lipids.

Option 4: Vitamin

Vitamins are essential for various bodily functions and are necessary for good health, but they do not