Amazin Brain While we have been looking at the advantages of good fats, we cannot ignore the bad fats. Good fats such as Omega 3's open up the fuel line to the metabolism and help it to burn efficiently. Bad fats do the exact opposite. Trans fats are unhealthy fats that are found in many processed foods such as chips, fast foods, etc. Putting these fats into your body actually put up a road block to your metabolic furnace, causing it to slow down and become less effective.