These stimulants tend to increase alertness without the peripheral (body) effects or addiction/tolerance/abuse potential of traditional stimulants (such as amphetamine), as they lack direct dopaminergic action. Their effect on sleep structure is not fully established and may reduce quality of sleep.
Trans fats, or trans-unsaturated fatty acids, trans fatty acids, are a type of unsaturated fats that are uncommon in nature but became commonly produced industrially from vegetable fats for use in margarine, snack food, packaged baked goods and frying fast food starting in the 1950s.nly unsaturated fats can be trans or cis fat, since only a double bond can be locked to these orientations. Saturated fatty acids are never called trans fats because they have no double bonds. Therefore, all their bonds are freely rotatable.
The difference between cis and trans is that the two H atoms are on the same side of the double bond (cis), compared to being on opposite sides (trans). This may not seem like much of a difference, but it affects the shapes of the molecules. In a cis configuration, the double bond creates a kink in the fatty acid. Both saturated fats and cis-unsaturated fats are natural. 2  We produce the necessary enzymes to metabolize these. 3  However, there is no evidence that we produce the enzymes to metabolize trans-fatty acids. 4  Fat-free and low-fat prepared foods typically replace the fat with something else that tastes good to us.