Low fat?

https://academic.oup.com/jhmas/article/63/2/139/772615

https://www.plewsandprof.com/single-post/2017/04/09/JAN-VAN-BERKEL-THE-FAT-ADAPTED-HEALTHY-ATHLETE-VISCERAL-FAT-AND-ITS-RELATIONSHIP-TO-HEALTH-AND-PERFORMANCE