OLIVE OILS AND HEALTH 156 Evidence from intervention studies, though limited in number, indicates that EVOO consumption can lead to modest yet significant reductions in body weight, body mass index (BMI), and waist circumference. Importantly, these effects are observed when EVOO is consumed in the context of a whole diet, not as a supplement in capsule form. This reinforces the idea that the dietary matrix and food synergy are critical for achieving health benefits. One of the most promising areas of research lies in EVOO’s influence on the gut microbiota. The polyphenols and other minor compounds in EVOO appear to enhance microbial diversity, increase the abundance of beneficial bacteria, and promote the production of short-chain fatty acids, all of which are linked to reduced chronic inflammation and improved metabolic health. Although more robust clinical trials are needed, current findings support a role for EVOO in modulating the microbiome in ways that may help manage body weight and reduce obesity risk. Finally, the chapter highlights the growing importance of precision nutrition -the tailoring of dietary recommendations based on genetic, microbial, and metabolic profiles-. The interaction between EVOO and the PPARG2 Pro12Ala polymorphism exemplifies how genetic variation can influence individual responses to dietary interventions. Carriers of the Ala allele experience more favorable changes in body composition with EVOO intake, suggesting that EVOO may be particularly beneficial for genetically predisposed individuals. In summary, EVOO emerges not only as a cornerstone of a healthy Mediterranean diet but also as a promising tool in personalized nutrition strategies aimed at obesity prevention and body composition optimization. As ongoing studies such as PREDIMED Plus provide more granular data, the potential to refine dietary guidelines and deliver individualised recommendations for the use of EVOO will continue to grow. Key Takeaways • Epidemiological evidence suggests that adherence to the Mediterranean diet -where extra virgin olive oil (EVOO) serves as the principal fat source- is associated with a lower prevalence of overweight and obesity. • Randomised controlled trials demonstrate that EVOO consumption can lead to modest but significant reductions in body weight, BMI, and waist circumference. These effects are more pronounced when EVOO is consumed as part of a dietary pattern rather than in isolation (e.g., capsules).
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