Dr William Davis presentation. When my wife and I went low carb going on 8 years ago, my triglycerides dropped (good) significantly, my LDL stayed about the same, and my HDL went up (also good).

https://www.youtube.com/watch?v=fwB1y_m4RC4

The liver converts carbs and sugars into triglycerides. Cut them down or out and triglycerides go down.