Since the 1950s, people have believed that saturated fat is bad for human health.
This was originally based on observational studies showing that countries that consumed a lot of saturated fat had higher rates of deaths from heart disease.
The diet-heart hypothesis states that saturated fat raises LDL cholesterol in the blood, which then supposedly lodges in the arteries and causes heart disease.
Even though this hypothesis has never been proven, most official dietary guidelines are based on it (1).
Interestingly, numerous recent studies have found no link between saturated fat consumption and heart disease.
This article reviews 5 of the largest, most comprehensive and most recent studies on this issue.