Very high triglycerides can be caused by poor diet and not enough exercise. You may also have inherited very high triglycerides from a parent. Your doctor will tell you how to manage your triglycerides. If your weight is higher than what is considered healthy, losing even 5 pounds may help lower your triglycerides.
WORD likes it un-hyphenated but I don't. Long-term should be hyphenated but longtime should not be hyphenated, at least until a few more decades pass and the grammatical rules for the use of hyphens either relax or fade away. Here is part of an erudite commentary on this subject:
The general trend is that over time, a construction starts out as two words, eventually becomes hyphenated, and finally ends up as one word. I.e., lawn mower becomes lawn-mower becomes lawnmower. Me, I prefer it as two words, but maybe that's because I'm an old fart and resistant to change.