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:
A hyphen (-) is a punctuation mark thatâs used to join words or parts of words. Use a hyphen in a compound modifier when the modifier comes before the word itâs modifying. If youâre not sure whether a compound word has a hyphen or not, check your preferred dictionary.