Here is a screen shot showing how a double bond can 'twist'.  cis  on the left means the SHAPE is the way our body would like to get and use the GOOD Unsaturated Fats. You can see the double bonds between the 2 carbons, then you can notice 2 H are below and 2 C's are above. When the H's are on the same side and the C's on same side the shape is recognizable and this is useful fat for the body to use. cis shaped unsaturated fats= useful (Except when the ratio of Unsaturated fat is off but that is another video. The point is  just like saturated fats  there is an  excess  issue to pay attention to. You don't NEED to know any of this carbon, hydrogen...in detail but it is helpful to understand that  at the double bond  - if  HAL  (Heat, Light, Air) negatively impact the unsaturated fat that the shape of  cis &amp;nbsp; takes on the shape of  TRANS;  you now have  negative impact  on the body. Repeat: The TRANS  shape   of unsaturated fats has negative impact on our body . Because of this we need to be aware of how to choose and care for our unsaturated fats for  CELL f  Care.