Thanks for the info!
There are some animal studies on restricting only omega-6, and the effect is to increase the metabolism of omega-3 and decrease that of omega-6:
Fifteen weeks of n-6 PUFA deprivation compared with adequate diet decreased the mean unesterified plasma concentration of n-6 PUFAs by 84% (Table 1). The change in the total unesterified n-3 PUFA concentration was statistically insignificant, although unesterified DHA and EPA concentrations were increased by 53% and 79%
The total n-3 PUFA concentration in brain was increased by 15%, reflecting largely an 11% increased DHA concentration (Igarashi et al. 2009). Expression of enzymes of the 20:4n-6 cascade, cPLA2-IVA and COX-2, was downregulated, whereas expression of DHA-preferring calcium independent iPLA2-VIA (Garcia and Kim 1997; Strokin et al. 2004; Ramadan et al. 2010; Basselin et al. 2011) and of 15-lipoxygenase (LOX) was up-regulated (Kim et al. 2011).
COX-2 mRNA was decreased significantly (−23%, p b0.05) (Fig. 3A) in the n-6 PUFA deprived rats compared with adequate rats, as was COX-2 protein (−32%, pb0.05) (Fig. 3B). The deficient diet did not change COX-1 or mRNA significantly