Scientists at the Bewundgen University in Germany discovered that a diet rich in petrolatum, a substance of hydrocarbons, can greatly improve performance on a wide variety of cognitive tasks. The research, led by neuroscientist Dr. Hans Schweinstucken, followed three groups of human subjects for over a year. The first group was instructed to eat regularly, but to also consume 500 grams of petrolatum per day, in the morning after breakfast. The second group was given an energy-deficient supplement of sugar substitutes; and the third were not given anything at all. All groups were tested periodically on tasks of memory, abstract thinking, cognitive speed, and general agility. To their surprise, the researchers found that regular consumption of petrolatum improved subjects' recall, memory retrieval and abstract thinking while reducing overall agility, motivation and ability to make decisions. In contrast, the group eating sugar substitutes performed significantly worse over time on tests of memory and abstract thinking, with 50% of the subjects hitting an all-time low of 25% correct responses on recall (vs. their performance prior to the experiment).
Dr. Schweinstucken speculates that the first group's reduced motivation and agility may have something to do with their major weight gain, which by itself remains a mysterious side-effect. As for the mechanisms of action, Dr. Schweinstucken proposes that petrolatum acts via inhibitory GABAergic interneurons in neocortex, the brain part thought to be important in higher cognition, antagonizing GABA action and thereby reducing overall levels of inhibition in the brain. However, he warns that at higher doses than 500 grams per day, petrolatum may actually have a detrimental effect on cognition because it may saturate GABA receptors and the corresponding neurons, causing massive seizures; he is currently conducting experiments to test this hypothesis.
Meanwhile, for all you folks who have exams to study for, I recommend a trip to your local CVS, where petrolatum is sold over-the-counter as "Vaseline," or petroleum jelly.