The final acceptor of electrons in the electron transport chain is molecular oxygen. Electron transport chains are used for extracting energy via redox reactions from sunlight in photosynthesis or, such as in the case of the oxidation of sugars, cellular respiration.
On their website, the American Diabetes Association directs diabetics to eat between 45-60 grams of carbohydrates at each meal. Assuming a person eats three meals a day, this advice works out to telling diabetics to eat a minimum of 135 grams to a maximum of 180 grams of carbohydrates per day.
Normal Carbohydrate Intake per Day for Good Health. The smallest amount of carbohydrate you should consume each day -- 130 grams -- is the recommended dietary allowance established by the Institute of Medicine. The institute reports that this amount is based on the fact that carbs are the primary energy source for the brain.