You can get both cholesterol and triglycerides from dietary sources (foods). Cholesterol comes only from the animal foods you eat. Triglycerides, on the other hand, are found in both animal fats and plant oils. Organ meats, such as liver and brains, contain lots of cholesterol, as do egg yolks, shrimp and lobster. Other meats, butter and whole milk also contain substantial amounts.
Your liver actually makes about two-thirds of the cholesterol and some of the triglycerides in your body.
To make cholesterol, the liver uses the fats you eat, primarily saturated fats, such as butter or lard, which are hard at room temperature. That's one reason a high-saturated-fat diet tends to lead to high blood cholesterol levels. In the case of triglycerides, both alcohol and sugar increase the liver's production.
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