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No control group? This study tells me literally nothing. It just demonstrates that the effects of tobacco are not the same as nicotine. That was already obvious.

No control group? Being awake for 27 hours will do that. They need to use either no light and/or sleeping subjects as controls..So far I've only read the abstract, so it's possible that they address this further down.

There are two additional types of meals that will be needed to clarify this issue. That is, one with a high-fat high-fiber meal, and another with a low-fiber high-carbohydrate meal. Nonetheless, one could argue that, in practice, carbohydrates correlate with fiber.