Answer the following question given this paragraph: 

Unsaturated fatty acids occur naturally in the bent shapes shown in Figure above . However, unsaturated fatty acids can be artificially manufactured to have straight chains like saturated fatty acids. Called trans fatty acids , these synthetic lipids were commonly added to foods until it was found that they increased the risk for certain health problems. Many food manufacturers no longer use trans fatty acids for this reason.


Q: What do you call the unhealthy synthetic lipids created when unsaturated fatty acids are artificially manufactured to have straight chains?


A:
trans fatty acids