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:
1 ââ¦ will occur in the short termâ¦â â in this example, short qualifies the noun term, not another word, so the two words are NOT hyphenated. ââ¦  high-pressure systemâ¦â â high and pressure are an adjectival phrase qualifying system. Therefore, hyphenate these words, i.e. âhigh-pressure systemâ.