The model foretells that hormones and especially the fat-building hormone, insulin, are crucial drivers of weight gain (although it acknowledges that without an excessive caloric intake, there can be no obesity). The model also predicts that while all calories may be the same when measured outside the body, when ingested, calories from carbohydrate, fat and protein act quite differently in a complex organism like the human body. And calories from carbohydrate are uniquely obesogenic (obesity causing) for three different but complementary reasons.
