Corrected entry: During the interview with Marion Nestle, PhD and Chair of nutrition and food studies, she claims that a calorie is the amount of energy needed to raise the temperature of one liter of water one degree Celsius. That is a very common mistake. She is talking about a kilocalorie (kcal) which is a thousand calories. One calorie is the amount of energy needed to raise the temperature of one gram of water one degree Celsius. That is 4.1868 joule of energy. (01:03:20)
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Correction: Actually, the submission is the common mistake: A calorie (small c) is the amount of energy needed to raise the temperature of a gram of water one degree Celsius. A Calorie (capital c) is the amount of energy needed to raise the temperature of a liter of water one degree. A Calorie (capital c) and a kilocalorie are the same thing, and when we're referring to food, we're just about ALWAYS talking about Calories (even though, in common usage, we don't capitalize it). I know it's confusing, but a quick Google search of "what is a calorie" will verify this correction.
K.C. Sierra