Difference between cholesterol and triglycerides: what they are and why they matter for heart health
Although both are related to fats in the blood, they serve different functions and respond to different daily habits, such as diet, alcohol consumption, and level of physical activity.
In routine medical check-ups, there are two figures that often generate confusion: cholesterol and triglycerides. Although both are related to fat in the blood, understanding the difference between cholesterol and triglycerides is key to assessing cardiovascular risk and preventing heart disease before the first symptoms appear.
In Mexico, this topic is especially relevant. According to the National Health and Nutrition Survey (Ensanut), 30.6% of adults in Mexico have a prior diagnosis of excess cholesterol in the blood. Additionally, the National Survey of Chronic Diseases (Enec) details that at least 24.4% of adults aged 20 to 69 presented high levels of triglycerides in the blood.
These metabolic alterations often progress silently and significantly increase the risk of heart attack and cardiovascular disease. Therefore, understanding what triglycerides are and how they affect cholesterol, as well as knowing how to correctly interpret a lipid profile, allows for more informed decisions about diet, physical activity, and daily habits.
What are cholesterol and triglycerides?
Cholesterol and triglycerides belong to the group of lipids, that is, fats that circulate in the blood and serve different functions in the body.
Cholesterol is a waxy substance present in all cells of the body. It participates in the production of hormones, vitamin D, and bile acids that help digest food. The liver produces all the cholesterol the body needs, although it is also obtained from animal-based foods.
Triglycerides, on the other hand, function as an energy reserve. When a person consumes more calories than needed—especially sugars and fats—the body converts that excess into triglycerides that are stored in adipose tissue.
“After a meal rich in fats or carbohydrates, the body transforms the excess energy into triglycerides for later use,” explains Romit Bhattacharya, preventive cardiologist at the Mass General Brigham Cardiovascular Institute.
Difference between cholesterol and triglycerides: distinct functions, shared risks
The difference between cholesterol and triglycerides lies in their main function. Cholesterol plays a structural and regulatory role, while triglycerides serve as a source of energy.
The problem arises when both are elevated above normal values. In excess, these fats can accumulate in the walls of the arteries and promote atherosclerosis, a condition that narrows blood vessels and increases the risk of heart attack and stroke.
Here, the relationship between high triglycerides and elevated cholesterol becomes key, as the simultaneous presence of both increases cardiovascular damage.
What are the normal levels of cholesterol and triglycerides?
Knowing the normal levels of cholesterol and triglycerides is essential for interpreting laboratory results.
For triglycerides:
- Normal: less than 150 mg/dL
- Borderline high: 150–199 mg/dL
- High: 200–499 mg/dL
- Very high: 500 mg/dL or more
Cholesterol is evaluated through three indicators:
- LDL (“bad” cholesterol): ideally below 100 mg/dL
- HDL (“good” cholesterol): above 40 mg/dL in men and 50 mg/dL in women
- Total cholesterol: desirable around 150 mg/dL; above 200 mg/dL is considered high
“Many people only look at total cholesterol, but analyzing each component provides a more accurate view of risk,” notes Bhattacharya.
What raises cholesterol and triglycerides?
Although they share risk factors, they do not always elevate for the same reasons.
High cholesterol is often associated with diets high in saturated and trans fats, sedentary lifestyle, smoking, genetics, aging, and diseases like type 2 diabetes.
Elevated triglycerides are more related to excessive consumption of sugars, alcohol, large food portions, overweight, and lack of physical activity. Certain medications can also affect them.
When these alterations persist over time, arterial damage progresses without clear signals. “Atherosclerosis can develop for years before manifesting with a cardiovascular event,” warns the specialist.
Diet and control: beyond medications
While there are effective pharmacological treatments, the foundation of control remains lifestyle. In particular, the diet to lower triglycerides plays a central role.
Among the most important recommendations are:
- Reduce refined sugars and sweetened beverages
- Limit alcohol consumption
- Prioritize fruits, vegetables, legumes, and whole grains
- Choose healthy fats like olive oil, avocado, and fish
- Control portions
These actions not only help lower triglycerides but also improve cholesterol profiles.
Long-term prevention
Cardiovascular diseases do not appear suddenly. They are the result of habits maintained over the years. The good news is that this process can be modified.
“Even small changes in diet, exercise, and metabolic health can be reflected in tests within months,” says Bhattacharya.
Understanding the difference between cholesterol and triglycerides, knowing their values, and acting early allows for risk reduction before the body sends alarm signals. In Mexico, where millions of people live with these alterations unknowingly, information becomes a key tool for prevention and public health.