Big Global Study Shows Why Carbs May Be Riskier Than Saturated Fat

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A study of over 135,000 adults across 18 countries challenges the idea that saturated fat is the main cause of heart disease. Many people wonder whether it is healthier to cut fats or carbohydrates from their diets. Knowing how different nutrients affect health can help people make better choices.

Not all carbohydrates are the same. Refined grains and added sugars can raise blood sugar and lead to fat storage, while whole grains and vegetables provide steady energy and important nutrients. Saturated fat, found in foods like dairy, butter, and ghee, has often been blamed for heart problems, but research shows its impact may depend on the rest of the diet.

The PURE (Prospective Urban and Rural Epidemiology) study found that eating more fat, including saturated fat, was not linked to higher risk of death. Eating a lot of carbohydrates, especially refined ones, was linked to higher risk of death. Dr. Salim Yusuf, the study’s lead investigator, said, “Our results suggest that fats, even saturated fats, are not inherently harmful, and that excessive carbohydrate intake, particularly from low-quality sources, may be more concerning for health.” This shows that the type of food matters more than labeling nutrients as simply “good” or “bad.”

People who eat mostly processed carbs may increase their risk of health problems even if they avoid fat. Those who include moderate amounts of natural fats, like butter or ghee, along with plenty of vegetables and whole grains, may have better outcomes.

The study suggests that instead of cutting all fat, people should focus on reducing refined carbs and eating more whole foods. Simple steps include swapping sugary snacks for fruits or vegetables, using natural fats in moderation, and having balanced meals with vegetables, whole grains, and protein.

This research challenges common nutrition advice and shows that paying attention to food quality, not just fat or carb content, can improve health. Choosing whole foods over processed carbohydrates is a small change that can make a big difference over time.

Reference: Dehghan, M. et al. (2017). Associations of fats and carbohydrate intake with cardiovascular disease and mortality in 18 countries from five continents (PURE): A prospective cohort study. https://doi.org/10.1016/S0140-6736(17)32252-3

Harvard T.H. Chan School of Public Health. (2017, September 8). PURE study makes headlines, but the conclusions are misleading. The Nutrition Source. https://nutritionsource.hsph.harvard.edu/2017/09/08/pure-study-makes-headlines-but-the-conclusions-are-misleading/