If one gram of each of the following were eaten as food, identify which would yield the most energy within the cell.

There are three food macro molecules which yield energy in the body, these are carbohydrates, fats and proteins. The fat gives the highest amount of energy inside the body. If one gram of a fatty food is eaten, it will produce 9 kilocalories. Thus, any food which fall into the class of fat and oil will yield the greatest energy within the cell.

What is your question then

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.