Butter, oils, margarine and most other dietary fats contain triglycerides. Excess caloric intake, especially in the form of sugar, starches and alcohol, can increase blood levels of triglycerides, according to the Cleveland Clinic.
Not all triglycerides come from food. When more calories are consumed than the body can use, the liver produces triglycerides and cholesterol, which the body then moves via the bloodstream to be stored as fat deposits.
High triglyceride levels have been known to contribute to incidents of heart disease and stroke. Experts say that triglyceride levels of less than 150 milligrams per deciliter of blood are normal. Triglyceride levels between 151 to 200 milligrams per deciliter are considered borderline high, and levels between 201 to 499 milligrams per deciliter are high.