A girl is celebrating her seventh birthday. Every guest is served one large slice of chocolate cake, a hamburger, French fries, and some oranges. Classify the food groups mentioned above. If one slice of chocolate cake contains 35 g od carbohydrats, 15g of fat and 5g of protein. Compute the kilocalories that each slice of cake contains. Classify all the food groups that form a part of a balanced diet along with their sources.