blood lipids is incorrectly written, and should be written as "blood lipid" being its meaning: Lipids, from the Greek lípos lipou: fat, are one of the three main categories of foods, along with 40 proteins; 41 proteins; and carbohydrates. Adequate food lipids should represent between 20% and 30% of the calories consumed, bearing in mind that each gram of fat has 9 calories and that a normal man takes every day about 2,000 calories. Lipids in blood are cholesterol and triglycerides, which can be measured in a blood test. Total cholesterol should not be greater than 200 mg/dl ( milligrams per deciliter of blood ) and acceptable triglycerides is 150 mg/dl or less.