I have high triglicerides and am on medication for them. My reseach goes pretty much in line with what everyone here has said about cutting out fats, sugar, alchohol and exercising. Here is the real bummer though. Two things can also elevate them and you only have control of one of them. They are heridity and weight. I am overweight (although I have lost 37 pounds since December) and as a result your body puts off triglicerides. They are the stored fat that turns back into sugars when you need them because your body is deprived of them. Heridity is what it is so bad genes can lead to higher levels.
So besides watching what you eat to lower them you gotta lose weight also and get rid of body fat.
I agree. I have congentially high lipids. I've been trying for literally years to get my numbers down, with and without drugs. Last spring I hit an all-time high of 497.

Critical mass. I was already taking Niaspan, specifically for triglycerides and my doctor doubled that.
With high triglycerides comes the high risk of type 2 diabetes. There is a strong connection between higher than avg blood sugar and high trigs. Obviously, that means lose the sugar, desserts, white flour/potatoes/rice/pasta, lower your fat intake, eat more green leafies and lean meat. Learn to like water or sweeteners(in limited quantities.) If you aren't used to working out it might be worth a few $$$ to hire a trainer to get you started and oversee your program for a month or so.
In my case,I DID develop type 2 diabetes and that scared me worse than the high triglycerides.

Together it puts me at much higher risk for heart disease. I started counting carbs & cals and have so far lost 47-lbs. At this point my trigs are 147, pretty impressive change I think. My LDL(bad chol.) is now normal, HDL(good chol.) is still very low. Total chol is about 150; I haven't been below 200 in 10 years. I work out 3 times a week, still not as much as I should but I'm doing 3 times better than I was.

My blood sugars are in good control and I have more energy. Hope you will have the same results or better.