... can cause high triglycerides, and cause false cholesterol results. My Heart Doctor wants me to take prescription fish oil, because my triglycerides are high, which is probably from the beta blocker, I am also on welchor for cholesterol. I seem to be going round and round with him. I am on a low-fat, low-cholesterol diet, I eat very little sugar, yet he tells me I have changed my eating habits, even though I haven't is the only reason my numbers are out of whack!! How do I get him to understand that the medicines are causing my numbers to be out of whack, which he should already know??