Excerpts from an Olive Oil Times article found at https://www.oliveoiltimes.com/features/study-confirms-olive-oils-role-in-weight-management/139862

A recent research review in the American Journal of Clinical Nutrition found that consuming seven grams of olive oil daily was associated with reduced weight gain over time, while other fats were linked to weight gain, according to data from 121,119 participants in three studies over three decades.

Another study found that olive oil with a phenol content higher than 366 milligrams per kilogram led to better weight loss outcomes than refined olive oil (2.7 milligrams per kilogram). 

The socioeconomic context also plays a role. The research review’s authors noted that olive oil intake in higher socioeconomic classes may correlate with vegetable consumption, which could contribute to weight loss.