Triglycerides high at my health check: where do I start?

If your triglycerides came back high at a health check, start by taking the result to a doctor and telling them how you prepared for the test, because triglycerides move more after a meal than any other blood fat. The doctor can tell you whether and when to test again, and how to prepare next time. Among the everyday factors connected with triglycerides, MedlinePlus, from the US National Library of Medicine, lists regularly eating more calories than you burn off, especially sugar, excessive alcohol use and smoking as able to raise them. You are far from alone: in Thailand's 2009 National Health Examination Survey, 38.6% of adults had 150 mg/dL or more.

What does a high triglyceride result mean?

MedlinePlus explains that triglycerides are a type of fat and the most common type of fat in the body. The blood fat section of a health check usually shows them next to total cholesterol, LDL and HDL.

The levels MedlinePlus uses

The MedlinePlus triglycerides test page gives these levels for adults, in milligrams per decilitre (mg/dL). They are US levels, not a Thai standard, and your lab may print its own reference range next to the result.

One number is not the whole picture

A single result is one moment in time. A doctor reads it together with your LDL, HDL and total cholesterol, your age, your family history and how you prepared for the test. If your report shows an "H" or a star next to triglycerides, that is a reason to talk to a doctor, not a reason to panic.

For what the other values on the report mean, see I'm in my early 30s. Should I start watching my blood fats?

Could the meal before the test have changed the number?

Yes. Of all the blood fats on the report, triglycerides respond most to the last meal.

How much a usual meal moves the numbers

A 2016 joint statement from two European scientific societies, led by Børge Nordestgaard, reviewed large observational data comparing blood fats measured with and without fasting. It reported that, 1 to 6 hours after habitual meals, the largest average changes were:

The same statement suggests that labs flag triglycerides at 150 mg/dL or more in a fasting sample, but at 175 mg/dL or more in a sample taken without fasting. Its conclusion is that these changes after usual meals are not clinically significant, and it recommends using blood samples taken without fasting as the routine for checking blood fats.

A hospital data study from Korea

A 2026 study by Shin and colleagues, laboratory medicine researchers in Korea, looked at 9.76 million test results from 101,148 adult outpatients at one 670-bed university hospital in the Seoul metropolitan area. Triglycerides were about 20.1% higher when people had fasted less than 8 hours. Between fasting 8 to 12 hours and fasting more than 12 hours, no test it examined differed by more than the accepted margin. The data come from one hospital and were collected for routine care, so they show a pattern rather than a rule for every person.

What this means for you

MedlinePlus says you may need to fast, not eating or drinking, for 9 to 12 hours before the test, and that your provider will tell you whether you need to. Follow the clinic's instructions on whether to fast. If you ate a late dinner, had sweet drinks or drank alcohol the night before, tell the doctor honestly, so they can read the result knowing what you had beforehand.

For preparing before a health check, see My health check is coming up again. What should I change?

How common are high triglycerides in Thailand?

Very common. Thailand's National Health Examination Survey (NHES) measures blood fats in a large sample of adults across the country.

What the 2009 survey found

Aekplakorn and colleagues at Ramathibodi Hospital, Mahidol University analysed blood fats from 19,021 adults aged 20 and over in the fourth survey in 2009.

What the sixth survey found

A study led by Chulalongkorn University and Ramathibodi Hospital researchers used the sixth survey, published in 2025, to describe usual blood fat levels in 17,018 Thai adults (7,244 men and 9,774 women) who were not already on medicine for blood fats and had no heart or blood vessel problems. Triglycerides were higher in men than in women in every age group under 70.

What these numbers can and cannot tell you

Both surveys measured each person once, and the 2009 figures are now more than 15 years old. They show that a high triglyceride result is common among Thai adults, especially men. They cannot tell you what your own result means; that is the doctor's job.

What everyday things can push triglycerides up?

MedlinePlus lists several factors that can raise triglyceride levels. Some are part of everyday life; others, such as genes, some medicines and some health conditions, need a doctor to look at.

Extra calories, especially from sugar

MedlinePlus explains that the body turns calories it does not need right away into triglycerides, and lists regularly eating more calories than you burn, especially sugar, as a factor. The UK's NHS advises adults to have no more than 30 g of free sugars a day, about 7 sugar cubes. Free sugars are sugars added to food or drinks, plus those in honey, syrups and fruit juice; the sugar in milk and whole fruit does not count. The NHS notes that one can of cola can contain up to 9 cubes of sugar.

In Thailand, sweet iced tea and coffee, bubble tea, sweetened soy milk and desserts with syrup are easy places for sugar to add up.

Alcohol

MedlinePlus lists excessive alcohol use as a factor. The NHS advises men and women not to regularly drink more than 14 units a week. Using the NHS formula, a large 620 ml bottle of 5% beer is about 3.1 units, so four and a half large bottles already reach 14 units.

For counting drinks and drink-free days, see I drink alcohol often. What should I know about blood fats?

Smoking and body weight

MedlinePlus also lists cigarette smoking and carrying extra weight among the factors. If either applies, mention it to the doctor when you go through the result.

Sugar and alcohol in a typical Thai week

The NHS amounts above, no more than 30 g of free sugars a day and 14 units of alcohol a week, are general guidance for all adults. Some everyday examples:

What general guidance applies to all adults?

The guidance below is general advice for all adults, not specific advice about triglycerides.

Physical activity

As general guidance for all adults, the World Health Organization advises 150 to 300 minutes of moderate-intensity activity, such as brisk walking, or 75 to 150 minutes of vigorous activity a week, plus muscle-strengthening on 2 or more days, and limiting time spent sitting.

Cooking methods

In its general eating guidance, the NHS suggests grilling, baking, poaching or steaming food rather than frying and choosing lean cuts of meat. For Thai food, it suggests a stir-fried or steamed dish with chicken, fish or vegetables, and watching out for curries made with coconut milk.

What should I talk to the doctor about?

The doctor can read your result most accurately when they know the full picture.

What to bring and tell

• this result and any earlier results
• how many hours you had fasted, and what you ate and drank the evening before
• how much you drink and smoke in a typical week
• any medicines you take regularly, because MedlinePlus notes that certain medicines can raise triglycerides

What to ask

• what your value means alongside your other blood fats
• how to prepare for the next test
• when to test again

When to go back sooner

If your report shows a value in the "very high" range, or several values are flagged, see a doctor soon rather than waiting for next year's check. Do not start, stop or change regular medicines on your own; ask the doctor or pharmacist first.