The poly-unsaturated fatty acid (PUFA) omega 6 creates inflammation through arachidonic acid. Foods high in omega 6 include red meat, corn, potatoes, tomatoes, eggplant, red peppers.
Omega 3’s – found in fish oil – couterbalance omega 6’s and reduce inflammation. Because fish is contra-indicated in pregnancy due to the mercury, many women are deficient in omega 3’s. Other sources include flax oil, chia seeds, krill oil, and eggs. Increasing high amount of omega 3’s during pregnancy result in a decreased risk of eczema in children, especially if mom has eczema (Kremmyda et 2009; Clin Rev Allergy Immunol). Non-fish sources of omega 3’s can be found in algae, which do not have the mercury risk (the same for krill oil).
There are many other benefits to supplementing with omega 3’s… as it is anti-inflammation. For brain function, memory, depression, cardiovascular disease, cancer, etc etc etc