In human Western diets, ω-6 FAs are in large excess compared to ω-3 FAs, now reaching
ratio close to 25:1 rather than the recommended 3:1 [9, 10]. These observations have raised
considerable interest to treat these disorders through non-invasive dietary supplementation
[11]. Because the biological effects of ω-3 FAs are dependent on the increased concentration of
omega-6 in tissues and blood, trying to modulate this ratio by increasing ω-3 FAs, has been the
goal of many clinical trials [12]. Increase in maternal fish consumption during pregnancy
increases gestation length, and reduces the risk of pregnancy complications [13, 14] although
the mechanisms governing these effects remain uncertain. Obese pregnant women develop
greater insulin resistance than normal weight women and increased adipose tissue inflammation
[15, 16]. Up-regulation of placental inflammatory pathways with elevated release of proinflammatory
cytokines also contributes to enhance systemic inflammation in obese women