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Once reused and reheated, trans fats, which increase "bad cholesterol" and decrease "good cholesterol", can form in the oil.

Another emerging lab test is the cardiometabolic index, which assesses a patient’s waist size–to–height ratio, “good cholesterol” levels, and ratio of triglycerides—a type of fat found in the blood.

The researchers defined a person's cholesterol as abnormal if they had either high total cholesterol; high LDL cholesterol or other types of "bad" cholesterol; moderately-high triglycerides; low HDL cholesterol, often thought of as "good cholesterol"; or if they had been prescribed cholesterol-lowering medication.

For decades, primary physicians and cardiologists have focused on two numbers: LDL or low-density lipoproteins, known as “bad cholesterol,” and HDL or high-density lipoproteins, aka “good cholesterol.”

Abnormally high levels of HDL-C, colloquially known as 'good cholesterol', are associated with an increased risk of dementia in older adults, a Monash University-led study has found.