Triglycerides
Triglycerides are a key form of transport and storage for fatty acids. This blood test measures circulating triglycerides and can be influenced by factors such as meals, alcohol and metabolic status.
What the value measures
Triglycerides are a central storage and transport form of fatty acids in cells and plasma. In the laboratory, the triglyceride value measures the concentration of circulating triglycerides in the plasma or serum. It is therefore not a direct measurement of body fat or the total amount of fat stored in tissue.
Fatty acids from the intestine are esterified into triglycerides, packaged in chylomicrons, large transport particles for dietary fats, and transported to muscle and fatty tissue. The liver can regenerate fatty acids, oxidize them or release them into the blood in triglyceride-rich VLDL transport particles (very-low-density lipoproteins).
Why the timing of the measurement is important
A routine fasting test is not mandatory for a general lipid profile. A consensus statement based on extensive observational data recommends the routine use of non-fasting profiles; Fasting and non-fasting values were comparable for predicting cardiovascular disease.
After usual meals, the maximum mean change in triglycerides one to six hours later was 0.3 mmol/l and 26 mg/dl, respectively. This is a group remedy and not an individual correction formula.
If a non-fasting value is above 5 mmol/l or 440 mg/dl, a fasting measurement can be considered. The statement names values above 10 mmol/l or 880 mg/dl as a life-threatening concentration with a risk of pancreatitis, i.e. inflammation of the pancreas.
What alcohol changes in acute situations
In a small controlled human study with eight healthy young men, a single oral administration of 0.6 g ethanol/kg body weight together with 0.7 g fat/kg body weight at breakfast increased and prolonged the postprandial response of triglyceride-rich lipoproteins, i.e. measured after a meal. Triglycerides also accumulated in IDL (intermediate density lipoproteins, i.e. intermediate lipoprotein particles).
The same amount of alcohol 12 hours before the test meal increased the fasting baseline but did not alter the subsequent postprandial changes in triglyceride-rich lipoproteins and IDL, nor the measured activity of lipoprotein lipase (LPL) and hepatic triglyceride lipase (HTGL), two enzymes involved in the degradation of triglyceride-rich lipoproteins. The experiment therefore does not provide direct evidence of a universal obligation to abstain from alcohol for 24 hours before each measurement.
Which metabolic situation can be behind high values
A pathophysiological review on insulin resistance, i.e. a reduced response of cells to insulin, and type 2 diabetes describes elevated VLDL triglycerides as a central feature of dyslipidemia. The sources she mentions include lipolysis in adipose tissue, i.e. the release of fatty acids from stored fats, lipoprotein residues and de novo lipogenesis, i.e. the new formation of fatty acids from glucose. VLDL overproduction can lead to lower levels of HDL (high-density lipoproteins) and small, dense LDL particles (low-density lipoproteins) via an exchange between lipoproteins mediated by cholesterol ester transfer protein (CETP).
The pattern of high triglycerides and low HDL may therefore correspond to insulin resistance. However, it is not a population-independent diagnostic limit and does not replace a direct diagnostic test.
Which means very high values for the risk
In the case of very high values, the consensus statement cites over 10 mmol/l or 880 mg/dl as a life-threatening concentration with a risk of pancreatitis.
In a retrospective cohort study of 2,256,261 people from Mediterranean primary care who were followed from 2010 to 2020, a triglyceride concentration of at least 500 mg/dl was associated with a higher risk of pancreatitis after taking other influencing factors into account: The hazard ratio (HR), a relative risk measure compared to the reference group, was 2.66; the 95% confidence interval (CI), a range for the statistical uncertainty of the estimate, ranged from 2.30 to 3.07. At at least 880 mg/dl, the HR was 3.79 (95% CI 3.10 to 4.63).
These values are relative associations from observational data. They do not provide an individual absolute probability or deterministic threshold beyond which an individual person will inevitably develop pancreatitis.
What can be derived from strength training
Direct evidence for bulking and dieting phases in strength training is limited. In a small, uncontrolled 24-week pilot study with seven untrained adult men with obesity, twelve weeks of bulking and twelve weeks of dieting combined with resistance training, triglycerides and the other measured lipids did not change significantly. The mean age was 33 ± 3 years and the mean body mass index (BMI) was 35.0 ± 4.6 kg/m².
This non-significant finding shows neither a typical increase in triglycerides during construction nor an automatic normalization in the diet of trained bodybuilders. The small sample, the lack of a control arm, the untrained population with obesity and a retention rate of 64 percent limit transferability.
- For the comparability of a follow-up check, the fasting status, time since the last meal and the time interval from alcohol are important contextual information. This does not result in a general obligation to stay sober; if non-fasting triglycerides are above 440 mg/dl, fasting measurement can be considered.
- A reading after acute alcohol administration is context dependent. The study shows a higher fasting baseline value for an evening dose twelve hours before the test meal, but no changed postprandial course in this experimental setup.
- Values from 500 mg/dl were associated with a higher risk of pancreatitis in the large cohort; from 880 mg/dl the relative increase in risk was greater. These thresholds answer a risk question and are not a personal forecast or general reference scale.
Limits of transferability
The study populations and designs are not interchangeable: the alcohol study examined eight healthy young men after an acute experimental dose, the pancreatitis analysis examined a large primary care cohort, and the bulk and cut project examined seven untrained men with obesity. From this data, neither a sport-specific normal value nor the course of an individual person's structure and diet can be predicted.
Sources
- Alves-Bezerra M et al. Triglyceride Metabolism in the Liver. Compr Physiol. 2017. PubMed
- Nordestgaard BG et al. Fasting is not routinely required for determination of a lipid profile: clinical and laboratory implications including flagging at desirable concentration cut-points-a joint consensus statement from the European Atherosclerosis Society and European Federation of Clinical Chemistry and Laboratory Medicine. Eur Heart J. 2016. PubMed
- Mudráková E et al. Postprandial triglyceridemia after single dose of alcohol in healthy young men. Nutr Metab Cardiovasc Dis. 2013. PubMed
- Ginsberg HN et al. Regulation of plasma triglycerides in insulin resistance and diabetes. Arch Med Res. 2005. PubMed
- Vlacho B et al. Hypertriglyceridemia and its relationship with all-cause mortality and pancreatitis: Results from a large retrospective clinical registry. J Clin Lipidol. 2025. PubMed
- Giannopoulos AJ et al. A Pilot 24-Week 'Bulk and Cut' Dietary Protocol Combined with Resistance Training Is Feasible and Improves Body Composition and TNF-α Concentrations in Untrained Adult Males. Nutrients. 2025. PubMed
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