Triglycerides are the most common form of fat circulating in the blood. They function as an energy reservoir, but persistently elevated levels are a signal that the body is struggling to manage carbohydrate and fat metabolism efficiently.
What it measures. The concentration of triglyceride molecules in serum, typically drawn fasting. Levels reflect both recent dietary intake and underlying metabolic processing.
Why it matters. Elevated triglycerides are associated with insulin resistance, fatty liver, pancreatitis risk at very high levels, and cardiovascular disease. They are one of the earliest signs that metabolic health is drifting, often appearing before glucose or HbA1c moves out of range.
What influences it. Refined carbohydrate and added sugar intake, alcohol consumption, body composition, physical activity, omega-3 status, thyroid function, and genetics. Triglycerides respond quickly — sometimes within days — to dietary change.
Worth knowing. The triglyceride-to-HDL ratio is a useful surrogate for insulin resistance and small, dense LDL particle burden. From a functional medicine perspective, a rising triglyceride number alongside a falling HDL is a signal to look upstream at carbohydrate quality, liver health, and metabolic flexibility.
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