Summary of energy sources  
1) In the absence of fat and glucose in the diet, as happens during starvation, glucose is formed from
2) If too much protein is ingested in the diet
3) What type of food can cause weight gain through increased fat deposits via pyruvic acid?
4) Which of the following substances are broken down and their carbon skeleton used to make glucose?
5) Which of the following substances are broken down and the carbon skeleton stored as fat without forming pyruvic acid?
6) What does the Krebs cycle produce that feeds straight into the electron transport chain?

7) Lactic acid is a product of anaerobic respiration. Lactic acid, however, is converted into which can later be stored as through the process of glycogenesis.
8) People say that protein is not stored by the body as a food or energy source, therefore it can not cause people to put on weight. According to the flow chart above is this true? Describe the path that excess protein can take.
9) Fats and lipids are a light weight source of chemical energy. Fat contains much more energy per gram than protein or carbohydrates. When fatty acids are used as an energy source they are first converted into
10) Describe how the amino acid alanine may or may not be able to form fats.
11) In a normal diet the excess protein ingested is broken down into amino acids which may later be used for